{"id":90244,"date":"2026-08-04T22:16:42","date_gmt":"2026-08-04T14:16:42","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/90244.html"},"modified":"2026-08-04T22:16:42","modified_gmt":"2026-08-04T14:16:42","slug":"flutter-%e6%bb%9a%e5%8a%a8%e4%bd%93%e7%b3%bb%e5%ae%8c%e5%85%a8%e6%8c%87%e5%8d%97%ef%bd%9csinglechildscrollview-listview-customscrollview-sliver-%e5%85%a8%e5%a5%97%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/90244.html","title":{"rendered":"Flutter \u6eda\u52a8\u4f53\u7cfb\u5b8c\u5168\u6307\u5357\uff5cSingleChildScrollView \/ ListView \/ CustomScrollView \/ Sliver \u5168\u5957\u8be6\u89e3"},"content":{"rendered":"<h2>Flutter \u6eda\u52a8\u4f53\u7cfb\u5b8c\u5168\u6307\u5357&#xff5c;SingleChildScrollView \/ ListView \/ CustomScrollView \/ Sliver \u5168\u5957\u8be6\u89e3<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260804141641-6a71f44959857.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260804141641-6a71f4496c633.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u5728 Flutter \u5f00\u53d1\u4e2d&#xff0c;\u6eda\u52a8\u7ec4\u4ef6\u662f\u9875\u9762\u642d\u5efa\u7684\u6838\u5fc3\u57fa\u77f3\u3002\u51e0\u4e4e\u6240\u6709 App \u90fd\u79bb\u4e0d\u5f00\u5217\u8868\u3001\u6eda\u52a8\u9875\u9762\u3001\u590d\u6742\u89c6\u5dee\u6298\u53e0\u3001\u5438\u9876\u5e03\u5c40\u3002<\/p>\n<p>\u5f88\u591a\u5f00\u53d1\u8005\u53ea\u4f1a\u7b80\u5355\u4f7f\u7528ListView&#xff0c;\u4f46\u4e0d\u77e5\u9053&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u4ec0\u4e48\u65f6\u5019\u7528 SingleChildScrollView<\/p>\n<\/li>\n<li>\n<p>ListView \u56db\u79cd\u6784\u9020\u7684\u6027\u80fd\u5dee\u5f02<\/p>\n<\/li>\n<li>\n<p>\u4e3a\u4ec0\u4e48 Column \u5d4c\u5957 ListView \u4f1a\u62a5\u9519<\/p>\n<\/li>\n<li>\n<p>\u590d\u6742\u6298\u53e0\u3001\u5438\u9876\u3001\u6df7\u5408\u5e03\u5c40\u5fc5\u987b\u7528 CustomScrollView &#043; Sliver<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e00\u3001Flutter \u6eda\u52a8\u4f53\u7cfb\u6574\u4f53\u67b6\u6784<\/h3>\n<p>Flutter \u6eda\u52a8\u7ec4\u4ef6\u5206\u4e3a\u4e09\u5927\u5c42\u7ea7&#xff1a;<\/p>\n<h4>1. \u57fa\u7840\u6eda\u52a8<\/h4>\n<p>SingleChildScrollView&#xff1a;\u4e00\u6b21\u6027\u6e32\u67d3\u5168\u90e8\u5b50\u7ec4\u4ef6&#xff0c;\u9002\u5408\u5c11\u91cf\u9759\u6001\u9875\u9762<\/p>\n<h4>2. \u5e38\u89c4\u5217\u8868\u6eda\u52a8<\/h4>\n<p>ListView \/ GridView&#xff1a;\u81ea\u5e26\u61d2\u52a0\u8f7d&#xff0c;\u9002\u5408\u5355\u4e00\u5217\u8868\u3001\u7f51\u683c\u4e1a\u52a1<\/p>\n<h4>3. \u9ad8\u7ea7\u590d\u6742\u6eda\u52a8&#xff08;Sliver \u4f53\u7cfb&#xff09;<\/h4>\n<p>CustomScrollView &#043; Sliver \u7cfb\u5217&#xff1a;\u652f\u6301\u6298\u53e0\u5934\u90e8\u3001\u5438\u9876\u3001\u6df7\u5408\u5e03\u5c40\u3001\u89c6\u5dee\u6548\u679c&#xff0c;\u9002\u5408\u9996\u9875\u3001\u8be6\u60c5\u9875\u3001\u590d\u6742\u9875\u9762<\/p>\n<hr \/>\n<h3>\u4e8c\u3001SingleChildScrollView \u57fa\u7840\u6eda\u52a8<\/h3>\n<h4>\u6838\u5fc3\u7279\u70b9<\/h4>\n<ul>\n<li>\n<p>\u53ea\u80fd\u5305\u542b\u4e00\u4e2a\u5b50\u7ec4\u4ef6&#xff08;\u901a\u5e38\u5d4c\u5957 Column&#xff09;<\/p>\n<\/li>\n<li>\n<p>\u65e0\u61d2\u52a0\u8f7d\u673a\u5236&#xff0c;\u4e00\u6b21\u6027\u6e32\u67d3\u6240\u6709 Widget<\/p>\n<\/li>\n<li>\n<p>\u9002\u5408&#xff1a;\u8868\u5355\u9875\u3001\u4e2a\u4eba\u4e2d\u5fc3\u3001\u9759\u6001\u957f\u9875\u9762<\/p>\n<\/li>\n<li>\n<p>\u7981\u6b62&#xff1a;\u5927\u6570\u636e\u5217\u8868\u3001\u957f\u5217\u8868<\/p>\n<\/li>\n<\/ul>\n<h4>\u57fa\u7840\u793a\u4f8b<\/h4>\n<p><span class=\"token class-name\">SingleChildScrollView<\/span><span class=\"token punctuation\">(<\/span><br \/>\n  padding<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">EdgeInsets<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">all<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">16<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  child<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Column<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    children<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><br \/>\n      <span class=\"token class-name\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u5185\u5bb91&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n      <span class=\"token class-name\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u5185\u5bb92&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n      <span class=\"token comment\">\/\/ \u5927\u91cf\u9759\u6001\u7ec4\u4ef6<\/span><br \/>\n    <span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<h4>\u5e38\u89c1\u95ee\u9898<\/h4>\n<ul>\n<li>\n<p>\u5185\u90e8\u5d4c\u5957\u8d85\u5927\u6570\u91cf\u7ec4\u4ef6\u4f1a\u5361\u987f\u3001\u5185\u5b58\u6ea2\u51fa<\/p>\n<\/li>\n<li>\n<p>\u4e0d\u652f\u6301 item \u56de\u6536&#xff0c;\u6027\u80fd\u4e0d\u5982 ListView<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e09\u3001ListView \u6df1\u5ea6\u8be6\u89e3<\/h3>\n<p>ListView \u662f Flutter \u6807\u51c6\u7ebf\u6027\u6eda\u52a8\u5217\u8868&#xff0c;\u81ea\u5e26\u61d2\u52a0\u8f7d\u3001\u7ec4\u4ef6\u56de\u6536&#xff0c;\u662f\u957f\u5217\u8868\u9996\u9009\u3002<\/p>\n<h4>3.1 ListView \u56db\u79cd\u6784\u9020\u65b9\u5f0f<\/h4>\n<h5>1&#xff09;ListView() \u9ed8\u8ba4\u6784\u9020<\/h5>\n<p>\u4e00\u6b21\u6027\u6e32\u67d3\u6240\u6709 children&#xff0c;\u65e0\u61d2\u52a0\u8f7d&#xff0c;\u4ec5\u9002\u5408\u5c11\u91cf\u6570\u636e\u3002<\/p>\n<p><span class=\"token class-name\">ListView<\/span><span class=\"token punctuation\">(<\/span><br \/>\n  children<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><br \/>\n    <span class=\"token class-name\">ListTile<\/span><span class=\"token punctuation\">(<\/span>title<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u6761\u76ee1&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token class-name\">ListTile<\/span><span class=\"token punctuation\">(<\/span>title<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u6761\u76ee2&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  <span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<h5>2&#xff09;ListView.builder<\/h5>\n<p>\u6309\u9700\u6784\u5efa\u53ef\u89c6\u533a\u57df Item&#xff0c;\u6ed1\u51fa\u5c4f\u5e55\u7acb\u5373\u9500\u6bc1&#xff0c;\u5e26\u6709\u61d2\u52a0\u8f7d&#xff0c;\u5927\u6570\u636e\u9996\u9009\u3002<\/p>\n<p><span class=\"token class-name\">ListView<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">builder<\/span><span class=\"token punctuation\">(<\/span><br \/>\n  itemCount<span class=\"token punctuation\">:<\/span> <span class=\"token number\">1000<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  itemBuilder<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">(<\/span>context<span class=\"token punctuation\">,<\/span> index<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">ListTile<\/span><span class=\"token punctuation\">(<\/span>title<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u6570\u636e <\/span><span class=\"token interpolation\"><span class=\"token punctuation\">$<\/span><span class=\"token expression\">index<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<h5>3&#xff09;ListView.separated \u5e26\u5206\u5272\u7ebf\u61d2\u52a0\u8f7d<\/h5>\n<p>\u5728 builder \u57fa\u7840\u4e0a\u652f\u6301\u81ea\u5b9a\u4e49\u5206\u5272\u7ebf&#xff0c;\u9879\u76ee\u6700\u5e38\u7528\u3002<\/p>\n<p><span class=\"token class-name\">ListView<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">separated<\/span><span class=\"token punctuation\">(<\/span><br \/>\n  itemCount<span class=\"token punctuation\">:<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  itemBuilder<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">(<\/span>ctx<span class=\"token punctuation\">,<\/span> idx<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token class-name\">ListTile<\/span><span class=\"token punctuation\">(<\/span>title<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u6570\u636e <\/span><span class=\"token interpolation\"><span class=\"token punctuation\">$<\/span><span class=\"token expression\">idx<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  separatorBuilder<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">(<\/span>ctx<span class=\"token punctuation\">,<\/span> idx<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token class-name\">Divider<\/span><span class=\"token punctuation\">(<\/span>height<span class=\"token punctuation\">:<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<h5>4&#xff09;ListView.custom \u81ea\u5b9a\u4e49<\/h5>\n<p>\u57fa\u4e8eSliverChildDelegate&#xff0c;\u53ef\u81ea\u5b9a\u4e49\u7f13\u5b58\u3001\u56de\u6536\u7b56\u7565&#xff0c;\u5e95\u5c42\u6240\u6709 ListView \u90fd\u57fa\u4e8e\u5b83\u5c01\u88c5\u3002<\/p>\n<h4>3.2 ListView \u6838\u5fc3\u5c5e\u6027\u8be6\u89e3<\/h4>\n<h5>scrollDirection \u6eda\u52a8\u65b9\u5411<\/h5>\n<ul>\n<li>\n<p>Axis.vertical&#xff1a;\u9ed8\u8ba4\u5782\u76f4<\/p>\n<\/li>\n<li>\n<p>Axis.horizontal&#xff1a;\u6c34\u5e73\u5217\u8868<\/p>\n<\/li>\n<\/ul>\n<h5>shrinkWrap<\/h5>\n<ul>\n<li>\n<p>false&#xff08;\u9ed8\u8ba4&#xff09;&#xff1a;\u5360\u6ee1\u7236\u5bb9\u5668&#xff0c;\u62e5\u6709\u5b8c\u6574\u61d2\u52a0\u8f7d<\/p>\n<\/li>\n<li>\n<p>true&#xff1a;\u81ea\u9002\u5e94\u5185\u5bb9\u9ad8\u5ea6&#xff0c;\u5931\u53bb\u61d2\u52a0\u8f7d\u80fd\u529b<\/p>\n<\/li>\n<\/ul>\n<p>\u573a\u666f&#xff1a;ListView \u5d4c\u5957 ListView \u5fc5\u987b\u5f00\u542f&#xff0c;\u4f46\u5927\u6570\u636e\u614e\u7528\u3002<\/p>\n<h5>itemExtent \u56fa\u5b9a\u6761\u76ee\u5c3a\u5bf8<\/h5>\n<p>\u63d0\u524d\u6307\u5b9a item \u9ad8\u5ea6\/\u5bbd\u5ea6&#xff0c;Flutter \u65e0\u9700\u5b9e\u65f6\u8ba1\u7b97\u5c3a\u5bf8&#xff0c;\u5927\u5e45\u63d0\u5347\u957f\u5217\u8868\u6027\u80fd\u3002<\/p>\n<h5>physics \u6eda\u52a8\u7269\u7406\u6548\u679c<\/h5>\n<ul>\n<li>\n<p>BouncingScrollPhysics&#xff1a;iOS \u56de\u5f39<\/p>\n<\/li>\n<li>\n<p>ClampingScrollPhysics&#xff1a;Android \u8fb9\u754c\u505c\u6b62<\/p>\n<\/li>\n<li>\n<p>NeverScrollableScrollPhysics&#xff1a;\u7981\u6b62\u6eda\u52a8<\/p>\n<\/li>\n<li>\n<p>AlwaysScrollableScrollPhysics&#xff1a;\u5185\u5bb9\u4e0d\u8db3\u4e5f\u53ef\u62c9\u52a8<\/p>\n<\/li>\n<\/ul>\n<h4>3.3 ScrollController \u6eda\u52a8\u76d1\u542c\u4e0e\u63a7\u5236<\/h4>\n<p>\u7528\u4e8e\u76d1\u542c\u6eda\u52a8\u504f\u79fb\u3001\u4ee3\u7801\u6eda\u52a8\u3001\u89e6\u5e95\u52a0\u8f7d\u3001\u56de\u5230\u9876\u90e8\u3002<\/p>\n<h5>\u6838\u5fc3\u80fd\u529b<\/h5>\n<ul>\n<li>\n<p>offset&#xff1a;\u5f53\u524d\u6eda\u52a8\u8ddd\u79bb<\/p>\n<\/li>\n<li>\n<p>maxScrollExtent&#xff1a;\u6700\u5927\u6eda\u52a8\u533a\u57df<\/p>\n<\/li>\n<li>\n<p>animateTo&#xff1a;\u5e73\u6ed1\u6eda\u52a8<\/p>\n<\/li>\n<li>\n<p>jumpTo&#xff1a;\u65e0\u52a8\u753b\u8df3\u8f6c<\/p>\n<\/li>\n<\/ul>\n<h5>\u5b8c\u6574\u793a\u4f8b<\/h5>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ListDemo<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">StatefulWidget<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token metadata function\">&#064;override<\/span><br \/>\n  <span class=\"token class-name\">State<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">ListDemo<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">createState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">_ListDemoState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> _ListDemoState <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">State<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">ListDemo<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  late <span class=\"token class-name\">ScrollController<\/span> _controller<span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token metadata function\">&#064;override<\/span><br \/>\n  <span class=\"token keyword\">void<\/span> <span class=\"token function\">initState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">initState<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    _controller <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">ScrollController<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    _controller<span class=\"token punctuation\">.<\/span><span class=\"token function\">addListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token comment\">\/\/ \u89e6\u5e95\u5224\u65ad<\/span><br \/>\n      <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>_controller<span class=\"token punctuation\">.<\/span>offset <span class=\"token operator\">&gt;&#061;<\/span> _controller<span class=\"token punctuation\">.<\/span>position<span class=\"token punctuation\">.<\/span>maxScrollExtent <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u89e6\u53d1\u4e0a\u62c9\u52a0\u8f7d&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><\/p>\n<p>  <span class=\"token comment\">\/\/\u9500\u6bc1\u9632\u6cc4\u6f0f<\/span><br \/>\n  <span class=\"token metadata function\">&#064;override<\/span><br \/>\n  <span class=\"token keyword\">void<\/span> <span class=\"token function\">dispose<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    _controller<span class=\"token punctuation\">.<\/span><span class=\"token function\">dispose<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">dispose<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><\/p>\n<p>  <span class=\"token metadata function\">&#064;override<\/span><br \/>\n  <span class=\"token class-name\">Widget<\/span> <span class=\"token function\">build<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">BuildContext<\/span> context<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">Column<\/span><span class=\"token punctuation\">(<\/span><br \/>\n      children<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><br \/>\n        <span class=\"token class-name\">ElevatedButton<\/span><span class=\"token punctuation\">(<\/span><br \/>\n          onPressed<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            _controller<span class=\"token punctuation\">.<\/span><span class=\"token function\">animateTo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> duration<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Duration<\/span><span class=\"token punctuation\">(<\/span>milliseconds<span class=\"token punctuation\">:<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> curve<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Curves<\/span><span class=\"token punctuation\">.<\/span>ease<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n          <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span><br \/>\n          child<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u56de\u5230\u9876\u90e8&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token class-name\">Expanded<\/span><span class=\"token punctuation\">(<\/span><br \/>\n          child<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">ListView<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">builder<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            controller<span class=\"token punctuation\">:<\/span> _controller<span class=\"token punctuation\">,<\/span><br \/>\n            itemCount<span class=\"token punctuation\">:<\/span> <span class=\"token number\">50<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            itemBuilder<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">(<\/span>_<span class=\"token punctuation\">,<\/span> idx<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token class-name\">ListTile<\/span><span class=\"token punctuation\">(<\/span>title<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;item <\/span><span class=\"token interpolation\"><span class=\"token punctuation\">$<\/span><span class=\"token expression\">idx<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n          <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token punctuation\">)<\/span><br \/>\n      <span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3.4 ListView \u5e38\u89c1\u62a5\u9519\u4e0e\u89e3\u51b3\u65b9\u6848<\/h4>\n<h5>Q1&#xff1a;Vertical viewport was given unbounded height<\/h5>\n<p>\u539f\u56e0&#xff1a;Column \/ Row \u5d4c\u5957 ListView&#xff0c;\u6eda\u52a8\u7ec4\u4ef6\u65e0\u8fb9\u754c\u7ea6\u675f<\/p>\n<p>\u89e3\u51b3&#xff1a;ListView \u5916\u5c42\u5305\u88f9 Expanded<\/p>\n<h5>Q2&#xff1a;\u5217\u8868\u6ea2\u51fa\u3001\u5361\u987f<\/h5>\n<p>\u89e3\u51b3&#xff1a;\u7981\u7528 shrinkWrap\u3001\u4f7f\u7528 builder\u3001\u8bbe\u7f6e itemExtent<\/p>\n<hr \/>\n<h3>\u56db\u3001Flutter \u9ad8\u7ea7\u6eda\u52a8&#xff1a;CustomScrollView &#043; Sliver<\/h3>\n<h4>4.1 \u4e3a\u4ec0\u4e48\u9700\u8981 Sliver&#xff1f;<\/h4>\n<p>\u666e\u901a ListView \/ GridView \u53ea\u80fd\u5355\u4e00\u6eda\u52a8\u5e03\u5c40\u3002<\/p>\n<p>\u4e1a\u52a1\u4e2d\u5e38\u89c1\u7684&#xff1a;\u6298\u53e0\u5934\u90e8 &#043; \u5438\u9876\u5bfc\u822a &#043; \u8f6e\u64ad &#043; \u5217\u8868 &#043; \u7f51\u683c\u6df7\u5408\u9875\u9762&#xff0c;\u666e\u901a\u7ec4\u4ef6\u5b8c\u5168\u65e0\u6cd5\u5b9e\u73b0\u3002<\/p>\n<p>\u4e8e\u662f Flutter \u63d0\u4f9b Sliver \u788e\u7247\u6eda\u52a8\u4f53\u7cfb&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u6240\u6709\u7ec4\u4ef6\u5171\u4eab\u540c\u4e00\u4e2a\u6eda\u52a8\u89c6\u53e3<\/p>\n<\/li>\n<li>\n<p>\u652f\u6301\u6298\u53e0\u3001\u62c9\u4f38\u3001\u7c98\u6027\u5438\u9876<\/p>\n<\/li>\n<li>\n<p>\u652f\u6301\u6df7\u5408\u591a\u79cd\u5e03\u5c40\u8054\u52a8\u6eda\u52a8<\/p>\n<\/li>\n<\/ul>\n<h4>4.2 Box \u7ec4\u4ef6 vs Sliver \u7ec4\u4ef6<\/h4>\n<table>\n<tr>\u4f53\u7cfb\u4ee3\u8868\u7ec4\u4ef6\u9002\u7528\u573a\u666f<\/tr>\n<tbody>\n<tr>\n<td>Box \u5e38\u89c4\u7ec4\u4ef6<\/td>\n<td>ListView\u3001Column\u3001Container<\/td>\n<td>\u7b80\u5355\u5355\u4e00\u5e03\u5c40<\/td>\n<\/tr>\n<tr>\n<td>Sliver \u6eda\u52a8\u788e\u7247<\/td>\n<td>SliverList\u3001SliverAppBar\u3001SliverPersistentHeader<\/td>\n<td>\u590d\u6742\u6eda\u52a8\u3001\u6298\u53e0\u3001\u5438\u9876\u3001\u6df7\u5408\u5e03\u5c40<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>4.3 \u5e38\u7528 Sliver \u7ec4\u4ef6\u5bf9\u7167\u8868<\/h4>\n<table>\n<tr>Sliver \u7ec4\u4ef6\u529f\u80fd\u8bf4\u660e\u5bf9\u5e94 Box \u7ec4\u4ef6<\/tr>\n<tbody>\n<tr>\n<td>SliverAppBar<\/td>\n<td>\u6298\u53e0\u3001\u62c9\u4f38\u3001\u60ac\u6d6e\u5bfc\u822a\u680f<\/td>\n<td>AppBar<\/td>\n<\/tr>\n<tr>\n<td>SliverList<\/td>\n<td>\u61d2\u52a0\u8f7d\u5217\u8868<\/td>\n<td>ListView.builder<\/td>\n<\/tr>\n<tr>\n<td>SliverGrid<\/td>\n<td>\u7f51\u683c\u5e03\u5c40<\/td>\n<td>GridView.builder<\/td>\n<\/tr>\n<tr>\n<td>SliverToBoxAdapter<\/td>\n<td>\u9002\u914d\u666e\u901a Widget<\/td>\n<td>\u5360\u4f4d\u5bb9\u5668<\/td>\n<\/tr>\n<tr>\n<td>SliverPersistentHeader<\/td>\n<td>\u7c98\u6027\u5438\u9876\u5934\u90e8<\/td>\n<td>\u65e0<\/td>\n<\/tr>\n<tr>\n<td>SliverPadding<\/td>\n<td>Sliver \u5185\u8fb9\u8ddd<\/td>\n<td>Padding<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6838\u5fc3\u7981\u5fcc&#xff1a;CustomScrollView \u4e2d\u4e0d\u80fd\u76f4\u63a5\u653e Container\/Text&#xff0c;\u666e\u901a\u7ec4\u4ef6\u5fc5\u987b\u5305\u88f9 SliverToBoxAdapter<\/p>\n<h4>4.4 SliverAppBar \u6298\u53e0\u5bfc\u822a\u6838\u5fc3\u53c2\u6570<\/h4>\n<p><span class=\"token class-name\">SliverAppBar<\/span><span class=\"token punctuation\">(<\/span><br \/>\n  expandedHeight<span class=\"token punctuation\">:<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span>    <span class=\"token comment\">\/\/ \u5c55\u5f00\u6700\u5927\u9ad8\u5ea6<\/span><br \/>\n  pinned<span class=\"token punctuation\">:<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">,<\/span>           <span class=\"token comment\">\/\/ \u6536\u7f29\u540e\u56fa\u5b9a\u5728\u9876\u90e8&#xff08;\u6700\u5e38\u7528&#xff09;<\/span><br \/>\n  floating<span class=\"token punctuation\">:<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  stretch<span class=\"token punctuation\">:<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">,<\/span>          <span class=\"token comment\">\/\/ \u4e0b\u62c9\u62c9\u4f38\u6548\u679c<\/span><br \/>\n  flexibleSpace<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">FlexibleSpaceBar<\/span><span class=\"token punctuation\">(<\/span><br \/>\n    title<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u6298\u53e0\u6807\u9898&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    background<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Container<\/span><span class=\"token punctuation\">(<\/span>color<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Colors<\/span><span class=\"token punctuation\">.<\/span>blue<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<h4>4.5 SliverPersistentHeader \u7c98\u6027\u5438\u9876<\/h4>\n<p>\u5b9e\u73b0\u6eda\u52a8\u6807\u9898\u5e38\u9a7b\u9876\u90e8\u6548\u679c&#xff0c;\u5fc5\u987b\u81ea\u5b9a\u4e49 Delegate<\/p>\n<h4>4.6 \u5b8c\u6574\u9ad8\u7ea7\u6df7\u5408\u6eda\u52a8 Demo<\/h4>\n<p>\u529f\u80fd&#xff1a;\u6298\u53e0\u5934\u90e8 &#043; \u5438\u9876\u6807\u9898 &#043; \u666e\u901a\u533a\u57df &#043; \u7f51\u683c &#043; \u5217\u8868<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token string-literal\"><span class=\"token string\">&#039;package:flutter\/material.dart&#039;<\/span><\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token function\">runApp<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token class-name\">MyApp<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MyApp<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">StatelessWidget<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> <span class=\"token class-name\">MyApp<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span><span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span>key<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token metadata function\">&#064;override<\/span><br \/>\n  <span class=\"token class-name\">Widget<\/span> <span class=\"token function\">build<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">BuildContext<\/span> context<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">MaterialApp<\/span><span class=\"token punctuation\">(<\/span>home<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">SliverPage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> debugShowCheckedModeBanner<span class=\"token punctuation\">:<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SliverPage<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">StatelessWidget<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token metadata function\">&#064;override<\/span><br \/>\n  <span class=\"token class-name\">Widget<\/span> <span class=\"token function\">build<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">BuildContext<\/span> context<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">Scaffold<\/span><span class=\"token punctuation\">(<\/span><br \/>\n      body<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">CustomScrollView<\/span><span class=\"token punctuation\">(<\/span><br \/>\n        slivers<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><br \/>\n          <span class=\"token comment\">\/\/ 1. \u6298\u53e0\u5934\u90e8<\/span><br \/>\n          <span class=\"token class-name\">SliverAppBar<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            expandedHeight<span class=\"token punctuation\">:<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            pinned<span class=\"token punctuation\">:<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            stretch<span class=\"token punctuation\">:<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            flexibleSpace<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">FlexibleSpaceBar<\/span><span class=\"token punctuation\">(<\/span><br \/>\n              title<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;Sliver \u9ad8\u7ea7\u6eda\u52a8\u9875\u9762&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n              background<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Container<\/span><span class=\"token punctuation\">(<\/span>color<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Colors<\/span><span class=\"token punctuation\">.<\/span>teal<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n          <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><\/p>\n<p>          <span class=\"token comment\">\/\/ 2. \u5438\u9876\u6807\u9898<\/span><br \/>\n          <span class=\"token class-name\">SliverPersistentHeader<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            pinned<span class=\"token punctuation\">:<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            delegate<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">MyHeaderDelegate<\/span><span class=\"token punctuation\">(<\/span><br \/>\n              height<span class=\"token punctuation\">:<\/span> <span class=\"token number\">48<\/span><span class=\"token punctuation\">,<\/span><br \/>\n              child<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Container<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                color<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Colors<\/span><span class=\"token punctuation\">.<\/span>white<span class=\"token punctuation\">,<\/span><br \/>\n                padding<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">EdgeInsets<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">symmetric<\/span><span class=\"token punctuation\">(<\/span>horizontal<span class=\"token punctuation\">:<\/span> <span class=\"token number\">16<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                alignment<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Alignment<\/span><span class=\"token punctuation\">.<\/span>centerLeft<span class=\"token punctuation\">,<\/span><br \/>\n                child<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;&#x1f525; \u7f51\u683c\u4e13\u533a&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span> style<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">TextStyle<\/span><span class=\"token punctuation\">(<\/span>fontSize<span class=\"token punctuation\">:<\/span> <span class=\"token number\">16<\/span><span class=\"token punctuation\">,<\/span> fontWeight<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">FontWeight<\/span><span class=\"token punctuation\">.<\/span>bold<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n              <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n          <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><\/p>\n<p>          <span class=\"token comment\">\/\/ 3. \u666e\u901a\u7ec4\u4ef6\u533a\u57df<\/span><br \/>\n          <span class=\"token class-name\">SliverToBoxAdapter<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            child<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Padding<\/span><span class=\"token punctuation\">(<\/span><br \/>\n              padding<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">EdgeInsets<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">all<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">16<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n              child<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u4e0b\u9762\u662f\u7f51\u683c\u5e03\u5c40\u6f14\u793a&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n          <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><\/p>\n<p>          <span class=\"token comment\">\/\/ 4. \u7f51\u683c\u5e03\u5c40<\/span><br \/>\n          <span class=\"token class-name\">SliverGrid<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            gridDelegate<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">SliverGridDelegateWithFixedCrossAxisCount<\/span><span class=\"token punctuation\">(<\/span><br \/>\n              crossAxisCount<span class=\"token punctuation\">:<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span><br \/>\n              crossAxisSpacing<span class=\"token punctuation\">:<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span><br \/>\n              mainAxisSpacing<span class=\"token punctuation\">:<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            delegate<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">SliverChildBuilderDelegate<\/span><span class=\"token punctuation\">(<\/span><br \/>\n              <span class=\"token punctuation\">(<\/span>_<span class=\"token punctuation\">,<\/span> idx<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token class-name\">Container<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                color<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Colors<\/span><span class=\"token punctuation\">.<\/span>primaries<span class=\"token punctuation\">[<\/span>idx <span class=\"token operator\">%<\/span> <span class=\"token class-name\">Colors<\/span><span class=\"token punctuation\">.<\/span>primaries<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                child<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Center<\/span><span class=\"token punctuation\">(<\/span>child<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u7f51\u683c <\/span><span class=\"token interpolation\"><span class=\"token punctuation\">$<\/span><span class=\"token expression\">idx<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n              <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n              childCount<span class=\"token punctuation\">:<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n          <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><\/p>\n<p>          <span class=\"token comment\">\/\/ \u7b2c\u4e8c\u4e2a\u5438\u9876\u6807\u9898<\/span><br \/>\n          <span class=\"token class-name\">SliverPersistentHeader<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            pinned<span class=\"token punctuation\">:<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            delegate<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">MyHeaderDelegate<\/span><span class=\"token punctuation\">(<\/span><br \/>\n              height<span class=\"token punctuation\">:<\/span> <span class=\"token number\">48<\/span><span class=\"token punctuation\">,<\/span><br \/>\n              child<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Container<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                color<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Colors<\/span><span class=\"token punctuation\">.<\/span>white<span class=\"token punctuation\">,<\/span><br \/>\n                padding<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">EdgeInsets<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">symmetric<\/span><span class=\"token punctuation\">(<\/span>horizontal<span class=\"token punctuation\">:<\/span> <span class=\"token number\">16<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                alignment<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Alignment<\/span><span class=\"token punctuation\">.<\/span>centerLeft<span class=\"token punctuation\">,<\/span><br \/>\n                child<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;&#x1f4c3; \u5217\u8868\u6570\u636e&#034;<\/span><\/span><span class=\"token punctuation\">,<\/span> style<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">TextStyle<\/span><span class=\"token punctuation\">(<\/span>fontSize<span class=\"token punctuation\">:<\/span> <span class=\"token number\">16<\/span><span class=\"token punctuation\">,<\/span> fontWeight<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">FontWeight<\/span><span class=\"token punctuation\">.<\/span>bold<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n              <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n          <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><\/p>\n<p>          <span class=\"token comment\">\/\/ 5. \u5217\u8868\u5e03\u5c40<\/span><br \/>\n          <span class=\"token class-name\">SliverList<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            delegate<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">SliverChildBuilderDelegate<\/span><span class=\"token punctuation\">(<\/span><br \/>\n              <span class=\"token punctuation\">(<\/span>_<span class=\"token punctuation\">,<\/span> idx<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token class-name\">ListTile<\/span><span class=\"token punctuation\">(<\/span>title<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u5217\u8868\u6761\u76ee <\/span><span class=\"token interpolation\"><span class=\"token punctuation\">$<\/span><span class=\"token expression\">idx<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n              childCount<span class=\"token punctuation\">:<\/span> <span class=\"token number\">30<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n          <span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n      <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5438\u9876 Header \u59d4\u6258<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MyHeaderDelegate<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">SliverPersistentHeaderDelegate<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">Widget<\/span> child<span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">final<\/span> double height<span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token class-name\">MyHeaderDelegate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">{<\/span>required <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>child<span class=\"token punctuation\">,<\/span> required <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>height<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token metadata function\">&#064;override<\/span><br \/>\n  <span class=\"token class-name\">Widget<\/span> <span class=\"token function\">build<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">BuildContext<\/span> context<span class=\"token punctuation\">,<\/span> double shrinkOffset<span class=\"token punctuation\">,<\/span> bool overlapsContent<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span><span class=\"token operator\">&gt;<\/span> child<span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token metadata function\">&#064;override<\/span><br \/>\n  double <span class=\"token keyword\">get<\/span> maxExtent <span class=\"token operator\">&#061;<\/span><span class=\"token operator\">&gt;<\/span> height<span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token metadata function\">&#064;override<\/span><br \/>\n  double <span class=\"token keyword\">get<\/span> minExtent <span class=\"token operator\">&#061;<\/span><span class=\"token operator\">&gt;<\/span> height<span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token metadata function\">&#064;override<\/span><br \/>\n  bool <span class=\"token function\">shouldRebuild<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">covariant<\/span> <span class=\"token class-name\">MyHeaderDelegate<\/span> oldDelegate<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> oldDelegate<span class=\"token punctuation\">.<\/span>child <span class=\"token operator\">!&#061;<\/span> child <span class=\"token operator\">||<\/span> oldDelegate<span class=\"token punctuation\">.<\/span>height <span class=\"token operator\">!&#061;<\/span> height<span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h3>\u4e94\u3001Flutter \u6eda\u52a8\u7ec4\u4ef6\u9009\u578b\u7ec8\u6781\u6807\u51c6<\/h3>\n<h4>1. \u5c11\u91cf\u9759\u6001\u9875\u9762<\/h4>\n<p>\u2705 SingleChildScrollView<\/p>\n<h4>2. \u7b80\u5355\u5217\u8868\u3001\u5927\u6570\u636e\u5217\u8868\u3001\u7011\u5e03\u6d41<\/h4>\n<p>\u2705 ListView \/ GridView&#xff08;builder \u6a21\u5f0f&#xff09;<\/p>\n<h4>3. \u9700\u8981\u6298\u53e0\u5934\u90e8\u3001\u5438\u9876\u3001\u6df7\u5408\u5e03\u5c40\u3001\u89c6\u5dee\u6548\u679c<\/h4>\n<p>\u2705 CustomScrollView &#043; Sliver \u5168\u5957\u4f53\u7cfb<\/p>\n<hr \/>\n<h3>\u516d\u3001\u6eda\u52a8\u7ec4\u4ef6\u6027\u80fd\u4f18\u5316\u603b\u7ed3<\/h3>\n<li>\n<p>\u957f\u5217\u8868\u5fc5\u987b\u4f7f\u7528 builder \u61d2\u52a0\u8f7d<\/p>\n<\/li>\n<li>\n<p>\u56fa\u5b9a item \u9ad8\u5ea6\u4f18\u5148\u8bbe\u7f6e itemExtent<\/p>\n<\/li>\n<li>\n<p>\u5c3d\u91cf\u907f\u514dshrinkWrap: true<\/p>\n<\/li>\n<li>\n<p>ScrollController \u9875\u9762\u9500\u6bc1\u5fc5\u987b dispose<\/p>\n<\/li>\n<li>\n<p>\u590d\u6742\u9875\u9762\u4f18\u5148 Sliver \u4f53\u7cfb&#xff0c;\u51cf\u5c11\u591a\u5c42\u5d4c\u5957\u6eda\u52a8<\/p>\n<\/li>\n<li>\n<p>itemBuilder \u5185\u4e0d\u521b\u5efa\u65b0\u5bf9\u8c61\u3001\u4e0d\u505a\u8017\u65f6\u64cd\u4f5c<\/p>\n<\/li>\n<hr \/>\n<h3>\u4e03\u3001\u603b\u7ed3<\/h3>\n<p>Flutter \u6eda\u52a8\u4e09\u4ef6\u5957&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u57fa\u7840\u6eda\u52a8&#xff1a;SingleChildScrollView<\/p>\n<\/li>\n<li>\n<p>\u5e38\u89c4\u5217\u8868\u6eda\u52a8&#xff1a;ListView \u56db\u79cd\u6784\u9020\u3001\u6eda\u52a8\u76d1\u542c\u3001\u6027\u80fd\u4f18\u5316<\/p>\n<\/li>\n<li>\n<p>\u9ad8\u7ea7\u590d\u6742\u6eda\u52a8&#xff1a;CustomScrollView &#043; \u5168\u5957 Sliver \u7ec4\u4ef6\u3001\u6298\u53e0\u3001\u5438\u9876\u3001\u6df7\u5408\u5e03\u5c40<\/p>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Flutter \u6eda\u52a8\u4f53\u7cfb\u5b8c\u5168\u6307\u5357&#xff5c;SingleChildScrollView \/ ListView \/ CustomScrollView \/ Sliver \u5168\u5957\u8be6\u89e3\u5728 Flutter 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