{"id":76083,"date":"2026-02-14T00:18:04","date_gmt":"2026-02-13T16:18:04","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/76083.html"},"modified":"2026-02-14T00:18:04","modified_gmt":"2026-02-13T16:18:04","slug":"flutter-for-openharmony-%e5%ae%9e%e6%88%98%e4%b9%8b%e5%9f%ba%e7%a1%80%e7%bb%84%e4%bb%b6%ef%bc%9a%e7%ac%ac%e4%ba%94%e5%8d%81%e5%85%ad%e7%af%87-sliverpersistentheader-%e6%89%93%e9%80%a0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/76083.html","title":{"rendered":"Flutter for OpenHarmony \u5b9e\u6218\u4e4b\u57fa\u7840\u7ec4\u4ef6\uff1a\u7b2c\u4e94\u5341\u516d\u7bc7 SliverPersistentHeader \u2014 \u6253\u9020\u6781\u81f4\u4e2a\u6027\u7684\u5438\u9876\u4ea4\u4e92\u5934\u90e8"},"content":{"rendered":"<p>\u6b22\u8fce\u52a0\u5165\u5f00\u6e90\u9e3f\u8499\u8de8\u5e73\u53f0\u793e\u533a&#xff1a;https:\/\/openharmonycrossplatform.csdn.net <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260213161800-698f4eb8b4776.jpg\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h2>Flutter for OpenHarmony \u5b9e\u6218\u4e4b\u57fa\u7840\u7ec4\u4ef6&#xff1a;\u7b2c\u4e94\u5341\u516d\u7bc7 SliverPersistentHeader \u2014 \u6253\u9020\u6781\u81f4\u4e2a\u6027\u7684\u5438\u9876\u4ea4\u4e92\u5934\u90e8<\/h2>\n<h3>\u524d\u8a00<\/h3>\n<p>\u5728\u8fdb\u884c\u590d\u6742\u7684\u957f\u5217\u8868\u5f00\u53d1\u65f6&#xff0c;\u6211\u4eec\u7ecf\u5e38\u9700\u8981\u5b9e\u73b0\u8fd9\u6837\u7684\u6548\u679c&#xff1a;\u5f53\u5217\u8868\u6ed1\u52a8\u5230\u67d0\u4e2a\u5206\u7c7b&#xff08;\u4f8b\u5982\u201c\u70ed\u95e8\u63a8\u8350\u201d&#xff09;\u65f6&#xff0c;\u8be5\u5206\u7c7b\u7684\u6807\u9898\u4f1a\u81ea\u52a8\u9501\u5b9a\u5e76\u201c\u5438\u9644\u201d\u5728\u5c4f\u5e55\u9876\u90e8&#xff0c;\u76f4\u5230\u4e0b\u4e00\u4e2a\u5206\u7c7b\u628a\u5b83\u9876\u8d70\u3002\u666e\u901a\u7684 AppBar \u53ea\u80fd\u5438\u9876\u4e00\u4e2a&#xff0c;\u800c SliverPersistentHeader \u5219\u662f\u4e3a\u4e86\u5b9e\u73b0\u201c\u591a\u7ea7\u8054\u52a8\u5438\u9876\u201d\u800c\u751f\u7684\u91cd\u578b\u6b66\u5668\u3002<\/p>\n<p>\u5728 Flutter for OpenHarmony \u5e73\u53f0\u4e0a&#xff0c;\u5229\u7528\u8fd9\u4e2a\u7ec4\u4ef6\u53ef\u4ee5\u6784\u5efa\u51fa\u6781\u5177\u52a8\u6001\u7f8e\u611f\u7684\u8be6\u60c5\u9875\u6216\u7d22\u5f15\u9875\u3002\u672c\u6587\u5c06\u8be6\u89e3\u5982\u4f55\u901a\u8fc7\u81ea\u5b9a\u4e49 Delegate&#xff0c;\u5728\u9e3f\u8499\u5e94\u7528\u4e2d\u5b9e\u73b0\u9ad8\u5ea6\u53ef\u5b9a\u5236\u7684\u5438\u9876\u5934\u90e8\u7279\u6548\u3002<\/p>\n<hr \/>\n<h3>\u4e00\u3001\u6838\u5fc3\u539f\u7406&#xff1a;SliverPersistentHeaderDelegate<\/h3>\n<p>\u4e0d\u540c\u4e8e\u666e\u901a\u7684 Widget&#xff0c;SliverPersistentHeader \u5fc5\u987b\u63a5\u6536\u4e00\u4e2a\u5b9e\u73b0\u4e86 SliverPersistentHeaderDelegate \u7684\u6d3e\u751f\u7c7b\u3002<\/p>\n<h4>1.1 \u4f60\u9700\u8981\u544a\u8bc9\u7cfb\u7edf\u56db\u4ef6\u4e8b&#xff1a;<\/h4>\n<ul>\n<li>minExtent&#xff1a;\u5934\u90e8\u6298\u53e0\u540e\u7684\u6700\u5c0f\u9ad8\u5ea6\u3002<\/li>\n<li>maxExtent&#xff1a;\u5934\u90e8\u5c55\u5f00\u65f6\u7684\u6700\u5927\u9ad8\u5ea6\u3002<\/li>\n<li>build&#xff1a;\u5982\u4f55\u6839\u636e\u5f53\u524d\u7684 shrinkOffset&#xff08;\u6536\u7f29\u504f\u79fb\u91cf&#xff09;\u6e32\u67d3\u4e0d\u540c\u7684 UI\u3002<\/li>\n<li>shouldRebuild&#xff1a;\u4f55\u65f6\u9700\u8981\u5237\u65b0\u5934\u90e8&#xff08;\u6027\u80fd\u4f18\u5316\u7684\u5173\u952e&#xff09;\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e8c\u3001\u5b9e\u6218\u6f14\u7ec3&#xff1a;\u6784\u5efa\u591a\u7ea7\u5438\u9876\u5206\u7c7b\u6807\u9898<\/h3>\n<h4>2.1 \u7f16\u5199\u81ea\u5b9a\u4e49 Delegate<\/h4>\n<p><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\">String<\/span> title<span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token class-name\">MyHeaderDelegate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>title<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 punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ shrinkOffset \u4ece 0 \u5230 maxExtent \u53d8\u5316<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u53ef\u4ee5\u6839\u636e shrinkOffset \u5b9e\u73b0\u6e10\u53d8\u8272\u3001\u6587\u5b57\u5927\u5c0f\u53d8\u5316\u7b49\u52a8\u6548<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">Container<\/span><span class=\"token punctuation\">(<\/span><br \/>\n      color<span class=\"token punctuation\">:<\/span> shrinkOffset <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">?<\/span> <span class=\"token class-name\">Colors<\/span><span class=\"token punctuation\">.<\/span>blue<span class=\"token punctuation\">[<\/span><span class=\"token number\">800<\/span><span class=\"token punctuation\">]<\/span> <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 number\">100<\/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      padding<span class=\"token punctuation\">:<\/span> <span class=\"token keyword\">const<\/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\">20<\/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>title<span class=\"token punctuation\">,<\/span> style<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">TextStyle<\/span><span class=\"token punctuation\">(<\/span><br \/>\n        color<span class=\"token punctuation\">:<\/span> shrinkOffset <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">?<\/span> <span class=\"token class-name\">Colors<\/span><span class=\"token punctuation\">.<\/span>white <span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Colors<\/span><span class=\"token punctuation\">.<\/span>black87<span class=\"token punctuation\">,<\/span><br \/>\n        fontWeight<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">FontWeight<\/span><span class=\"token punctuation\">.<\/span>bold<br \/>\n      <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<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> <span class=\"token number\">80.0<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5c55\u5f00\u9ad8\u5ea6<\/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> <span class=\"token number\">50.0<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5438\u9876\u540e\u7684\u56fa\u5b9a\u9ad8\u5ea6<\/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\">SliverPersistentHeaderDelegate<\/span> oldDelegate<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>2.2 \u5728 CustomScrollView \u4e2d\u4f7f\u7528<\/h4>\n<p><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 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> <span class=\"token comment\">\/\/ \u6838\u5fc3&#xff1a;\u8bbe\u4e3a true \u624d\u4f1a\u5438\u9876<\/span><br \/>\n      delegate<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">MyHeaderDelegate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u5206\u7c7b\u4e00&#xff1a;\u9e3f\u8499\u7ec4\u4ef6&#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\">SliverList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token comment\">\/\/ \u5bf9\u5e94\u7684\u5c55\u793a\u5217\u8868<\/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><span class=\"token string-literal\"><span class=\"token string\">&#034;\u5206\u7c7b\u4e8c&#xff1a;\u5f00\u53d1\u5b9e\u6218&#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\">SliverList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">.<\/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><span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260213161800-698f4eb8d8a34.gif\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<hr \/>\n<h3>\u4e09\u3001\u8fdb\u9636&#xff1a;\u6253\u9020\u89c6\u5dee\u7ffb\u8f6c\u6548\u679c<\/h3>\n<p>\u7531\u4e8e\u6211\u4eec\u5728 build \u4e2d\u53ef\u4ee5\u5b9e\u65f6\u83b7\u53d6 shrinkOffset\u3002<\/p>\n<p>&#x1f4a1; \u52a8\u6548\u601d\u8def&#xff1a; \u4f60\u53ef\u4ee5\u6839\u636e (maxExtent &#8211; shrinkOffset) \/ maxExtent \u8ba1\u7b97\u51fa\u4e00\u4e2a 0 \u5230 1 \u7684\u8fdb\u5ea6\u503c\u3002\u5229\u7528\u8fd9\u4e2a\u503c\u6765\u52a8\u6001\u7f29\u653e\u80cc\u666f\u56fe\u7247\u3001\u8c03\u6574\u6587\u5b57\u900f\u660e\u5ea6\u6216\u662f\u6539\u53d8\u56fe\u6807\u7684\u65cb\u8f6c\u89d2\u5ea6\u3002\u5728\u9e3f\u8499\u7aef\u5c55\u73b0\u51fa\u4e00\u79cd\u201c\u547c\u5438\u611f\u201d\u5341\u8db3\u7684\u6298\u53e0\u4f53\u9a8c\u3002<\/p>\n<p>double progress <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>maxExtent <span class=\"token operator\">&#8211;<\/span> shrinkOffset<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">\/<\/span> maxExtent<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token class-name\">Stack<\/span><span class=\"token punctuation\">(<\/span><br \/>\n  fit<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">StackFit<\/span><span class=\"token punctuation\">.<\/span>expand<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\">Opacity<\/span><span class=\"token punctuation\">(<\/span>opacity<span class=\"token punctuation\">:<\/span> progress<span class=\"token punctuation\">,<\/span> child<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Image<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">network<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/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 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;\u6807\u9898&#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 operator\">&#043;<\/span> <span class=\"token number\">10<\/span> <span class=\"token operator\">*<\/span> progress<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><span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260213161801-698f4eb9bbc76.gif\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<hr \/>\n<h3>\u56db\u3001OpenHarmony \u5e73\u53f0\u9002\u914d\u5efa\u8bae<\/h3>\n<h4>4.1 \u6eda\u52a8\u89e6\u611f\u53cd\u9988\u9002\u914d<\/h4>\n<p>\u5728\u9e3f\u8499\u7cfb\u7edf\u4e0a&#xff0c;\u5f53\u5438\u9876\u5934\u90e8\u6b63\u597d\u201c\u8d34\u201d\u5230\u9876\u7aef\u90a3\u4e00\u77ac\u95f4\u3002<\/p>\n<p>\u2705 \u63a8\u8350\u65b9\u6848&#xff1a; \u76d1\u542c shrinkOffset\u3002\u5f53 shrinkOffset &#061;&#061; maxExtent &#8211; minExtent&#xff08;\u5373\u521a\u8fbe\u5230\u5b8c\u5168\u6298\u53e0\u72b6\u6001&#xff09;\u65f6&#xff0c;\u53ef\u4ee5\u89e6\u53d1\u4e00\u6b21\u6781\u5176\u5fae\u5f31\u7684 HapticFeedback.lightImpact()\u3002\u8fd9\u79cd\u7cbe\u7ec6\u7684\u53cd\u9988\u80fd\u8ba9\u9e3f\u8499\u7528\u6237\u611f\u89c9\u5230\u754c\u9762\u5143\u7d20\u201c\u5230\u4f4d\u201d\u4e86\u3002<\/p>\n<h4>4.2 \u6027\u80fd\u4e0e shouldRebuild<\/h4>\n<p>\u5438\u9876\u5934\u90e8\u5728\u6ed1\u52a8\u8fc7\u7a0b\u4e2d\u6bcf\u4e00\u5e27\u90fd\u4f1a\u8c03\u7528 build\u3002<\/p>\n<p>&#x1f4a1; \u8c03\u4f18\u5efa\u8bae&#xff1a; \u5728\u9e3f\u8499\u7aef\u9ad8\u5237\u5c4f\u5e55&#xff08;120Hz&#xff09;\u4e0a&#xff0c;\u786e\u4fdd build \u65b9\u6cd5\u5185\u90e8\u903b\u8f91\u8db3\u591f\u8f7b\u91cf\u3002\u4e0d\u8981\u5728 build \u65b9\u6cd5\u91cc\u521d\u59cb\u5316\u4efb\u4f55\u63a7\u5236\u5668\u6216\u8fdb\u884c\u8017\u65f6\u8fd0\u7b97\u3002\u540c\u65f6\u5728 shouldRebuild \u4e2d\u901a\u8fc7\u5224\u65ad\u5173\u952e\u53c2\u6570&#xff08;\u5982 Title \u662f\u5426\u6539\u53d8&#xff09;\u6765\u51b3\u5b9a\u662f\u5426\u771f\u6b63\u91cd\u7ed8&#xff0c;\u51cf\u5c11\u4e0d\u5fc5\u8981\u7684 GPU \u635f\u8017\u3002<\/p>\n<h4>4.3 \u72b6\u6001\u680f\u989c\u8272\u9002\u914d<\/h4>\n<p>\u9e3f\u8499\u7cfb\u7edf\u7684\u72b6\u6001\u680f\u6587\u5b57\u989c\u8272&#xff08;\u6df1\u8272\/\u6d45\u8272&#xff09;\u4f1a\u5f71\u54cd\u9605\u8bfb\u4f53\u9a8c\u3002<\/p>\n<p>\u2705 \u6700\u4f73\u5b9e\u8df5&#xff1a; \u65e2\u7136\u5438\u9876\u5934\u90e8\u5728\u6536\u7f29\u540e\u989c\u8272\u5f80\u5f80\u4f1a\u52a0\u6df1&#xff0c;\u5efa\u8bae\u5728 build \u65b9\u6cd5\u4e2d\u5224\u65ad shrinkOffset\u3002\u5f53\u8fdb\u5165\u6536\u7f29\u72b6\u6001\u65f6&#xff0c;\u901a\u8fc7 SystemUiOverlayStyle \u52a8\u6001\u5c06\u9e3f\u8499\u72b6\u6001\u680f\u8bbe\u7f6e\u4e3a\u6d45\u8272\u6a21\u5f0f&#xff08;\u767d\u8272\u6587\u5b57&#xff09;&#xff0c;\u786e\u4fdd\u89c6\u89c9\u4e0a\u7684\u8fde\u8d2f\u6027\u548c\u6613\u8bfb\u6027\u3002<\/p>\n<hr \/>\n<h3>\u4e94\u3001\u5b8c\u6574\u793a\u4f8b\u4ee3\u7801<\/h3>\n<p>\u4ee5\u4e0b\u4ee3\u7801\u6f14\u793a\u4e86\u4e00\u4e2a\u5e26\u6709\u201c\u989c\u8272\u6e10\u53d8\u201d\u548c\u201c\u6587\u5b57\u7f29\u653e\u201d\u7684\u4e13\u4e1a\u5438\u9876\u5934\u90e8\u5b9e\u6218\u793a\u4f8b\u3002<\/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\">class<\/span> <span class=\"token class-name\">PersistentHeaderGradientPage<\/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\">PersistentHeaderGradientPage<\/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\">Scaffold<\/span><span class=\"token punctuation\">(<\/span><br \/>\n      appBar<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">AppBar<\/span><span class=\"token punctuation\">(<\/span>title<span class=\"token punctuation\">:<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token class-name\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#039;\u6e10\u53d8\u5438\u9876\u5b9e\u6218&#039;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/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 function\">_buildHeader<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u534e\u4e3a HarmonyOS \u5b9e\u6218\u7cfb\u5217&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/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>c<span class=\"token punctuation\">,<\/span> i<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;\u57fa\u7840\u8bfe #<\/span><span class=\"token interpolation\"><span class=\"token punctuation\">$<\/span><span class=\"token expression\">i<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                  childCount<span class=\"token punctuation\">:<\/span> <span class=\"token number\">15<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n          <span class=\"token function\">_buildHeader<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;Flutter \u8de8\u5e73\u53f0\u5f00\u53d1\u8fdb\u9636&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n          <span class=\"token class-name\">SliverList<\/span><span class=\"token punctuation\">(<\/span><br \/>\n              delegate<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">SliverChildBuilderDelegate<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                  <span class=\"token punctuation\">(<\/span>c<span class=\"token punctuation\">,<\/span> i<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token class-name\">ListTile<\/span><span class=\"token punctuation\">(<\/span>title<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u9ad8\u7ea7\u8bfe #<\/span><span class=\"token interpolation\"><span class=\"token punctuation\">$<\/span><span class=\"token expression\">i<\/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\">15<\/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><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<p>  <span class=\"token class-name\">Widget<\/span> <span class=\"token function\">_buildHeader<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> title<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <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 function\">_CustomHeaderDelegate<\/span><span class=\"token punctuation\">(<\/span>title<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 keyword\">class<\/span> _CustomHeaderDelegate <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\">String<\/span> title<span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token function\">_CustomHeaderDelegate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>title<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><br \/>\n      <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 punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ &#x1f4a1; \u8ba1\u7b97\u6536\u7f29\u6bd4\u4f8b&#xff08;\u4ece 1.0 \u4e3a\u5168\u5c55\u5f00&#xff0c;0.0 \u4e3a\u5b8c\u5168\u91cd\u53e0\/\u5438\u9876&#xff09;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u9632\u6b62\u9664\u96f6\u5f02\u5e38&#xff0c;\u867d\u7136 minExtent \u4e0d\u592a\u53ef\u80fd\u7b49\u4e8e maxExtent<\/span><br \/>\n    <span class=\"token keyword\">final<\/span> double extentDiff <span class=\"token operator\">&#061;<\/span> maxExtent <span class=\"token operator\">&#8211;<\/span> minExtent<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">final<\/span> double visiblePercent <span class=\"token operator\">&#061;<\/span><br \/>\n        extentDiff <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">?<\/span> <span class=\"token number\">0<\/span> <span class=\"token punctuation\">:<\/span> <span class=\"token number\">1.0<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token punctuation\">(<\/span>shrinkOffset <span class=\"token operator\">\/<\/span> extentDiff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">clamp<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0.0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1.0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">Container<\/span><span class=\"token punctuation\">(<\/span><br \/>\n      decoration<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">BoxDecoration<\/span><span class=\"token punctuation\">(<\/span><br \/>\n        gradient<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">LinearGradient<\/span><span class=\"token punctuation\">(<\/span><br \/>\n          colors<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><br \/>\n            <span class=\"token class-name\">Color<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">lerp<\/span><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 number\">100<\/span><span class=\"token punctuation\">]<\/span><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 number\">900<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">&#8211;<\/span> visiblePercent<span class=\"token punctuation\">)<\/span><span class=\"token operator\">!<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token class-name\">Color<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">lerp<\/span><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 number\">200<\/span><span class=\"token punctuation\">]<\/span><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 number\">800<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">&#8211;<\/span> visiblePercent<span class=\"token punctuation\">)<\/span><span class=\"token operator\">!<\/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><br \/>\n      alignment<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Alignment<\/span><span class=\"token punctuation\">.<\/span>center<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><br \/>\n        title<span class=\"token punctuation\">,<\/span><br \/>\n        style<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">TextStyle<\/span><span class=\"token punctuation\">(<\/span><br \/>\n          fontSize<span class=\"token punctuation\">:<\/span> <span class=\"token number\">16<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">8<\/span> <span class=\"token operator\">*<\/span> visiblePercent<span class=\"token punctuation\">,<\/span> <span class=\"token comment\">\/\/ \u6587\u5b57\u4ece 24 \u7f29\u653e\u5230 16<\/span><br \/>\n          color<span class=\"token punctuation\">:<\/span> visiblePercent <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0.5<\/span> <span class=\"token operator\">?<\/span> <span class=\"token class-name\">Colors<\/span><span class=\"token punctuation\">.<\/span>white <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 number\">900<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span><br \/>\n          fontWeight<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">FontWeight<\/span><span class=\"token punctuation\">.<\/span>bold<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><\/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> <span class=\"token number\">120.0<\/span><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> <span class=\"token number\">60.0<\/span><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> _CustomHeaderDelegate 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>title <span class=\"token operator\">!&#061;<\/span> title<span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260213161802-698f4eba9fc84.gif\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<hr \/>\n<h3>\u516d\u3001\u603b\u7ed3<\/h3>\n<p>\u5728 Flutter for OpenHarmony \u7684\u590d\u6742\u957f\u9875\u9762\u8bbe\u8ba1\u4e2d&#xff0c;SliverPersistentHeader \u662f\u6253\u7834\u5e73\u5eb8\u89c6\u89c9\u7684\u6740\u624b\u950f\u3002<\/p>\n<li>Delegate \u662f\u6838\u5fc3&#xff1a;\u901a\u8fc7 shrinkOffset \u638c\u63a7\u4e00\u5207\u52a8\u6548\u7684\u53d8\u5316\u6570\u503c\u3002<\/li>\n<li>Pinned \u5c5e\u6027&#xff1a;\u8ba9\u4f60\u7684\u6807\u9898\u5728\u7528\u6237\u6700\u9700\u8981\u5b83\u6307\u5f15\u4f4d\u7f6e\u65f6&#xff0c;\u6c38\u8fdc\u201c\u9501\u5b9a\u201d\u5728\u89c6\u7ebf\u5185\u3002<\/li>\n<li>\u5f00\u53d1\u51c6\u5219&#xff1a;\u5728\u9e3f\u8499\u7aef\u5229\u7528\u597d\u6e10\u53d8\u8fc7\u6e21\u4e0e\u89e6\u611f\u56de\u4f20&#xff0c;\u662f\u533a\u5206\u521d\u7ea7\u5f00\u53d1\u8005\u4e0e\u9ad8\u7ea7\u67b6\u6784\u5e08\u7684\u5173\u952e\u7ec6\u8282\u3002<\/li>\n<hr \/>\n<p>&#x1f4e6; \u5b8c\u6574\u4ee3\u7801\u5df2\u4e0a\u4f20\u81f3 AtomGit&#xff1a;flutter_ohos_examples<\/p>\n<p>&#x1f310; 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