{"id":104,"date":"2019-01-02T09:45:10","date_gmt":"2019-01-02T01:45:10","guid":{"rendered":"http:\/\/www.tairongkj.com\/?p=104"},"modified":"2019-01-13T20:36:46","modified_gmt":"2019-01-13T12:36:46","slug":"%e7%90%86%e8%a7%a3flutter-widget%e7%9a%84%e7%94%9f%e5%91%bd%e5%91%a8%e6%9c%9f","status":"publish","type":"post","link":"https:\/\/www.tairongkj.com\/?p=104","title":{"rendered":"\u7406\u89e3Flutter widget\u7684\u751f\u547d\u5468\u671f"},"content":{"rendered":"<h1 id=\"alcgld\" data-type=\"h\"><a id=\"span,[object-object],span,[object-object],span,[object-object],\u524d\u8a00\uff1a\" class=\"anchor\" href=\"#alcgld\"><\/a><span style=\"color: #4f4f4f;\" data-type=\"color\"><span style=\"background-color: #ffffff;\" data-type=\"background\">\u524d\u8a00\uff1a<\/span><\/span><\/h1>\n<div data-type=\"p\"><span style=\"color: #4f4f4f;\" data-type=\"color\"><span style=\"background-color: #ffffff;\" data-type=\"background\">\u751f\u547d\u5468\u671f\u662f\u4e00\u4e2a\u7ec4\u4ef6\u52a0\u8f7d\u5230\u5378\u8f7d\u7684\u6574\u4e2a\u5468\u671f\uff0c\u719f\u6089\u751f\u547d\u5468\u671f\u53ef\u4ee5\u8ba9\u6211\u4eec\u5728\u5408\u9002\u7684\u65f6\u673a\u505a\u8be5\u505a\u7684\u4e8b\u60c5\uff0c&nbsp;<\/span><\/span><br \/>\n<span style=\"color: #4f4f4f;\" data-type=\"color\"><span style=\"background-color: #ffffff;\" data-type=\"background\">flutter\u4e2d\u7684State\u751f\u547d\u5468\u671f\u548candroid\u4ee5\u53caReact Native\u7684\u751f\u547d\u5468\u671f\u7c7b\u4f3c\u3002<\/span><\/span><\/div>\n<div data-type=\"p\"><\/div>\n<h1 id=\"1iaftx\" data-type=\"h\"><a id=\"\u751f\u547d\u5468\u671f\u7684\u6d41\u7a0b\u56fe\uff1a\" class=\"anchor\" href=\"#1iaftx\"><\/a>\u751f\u547d\u5468\u671f\u7684\u6d41\u7a0b\u56fe\uff1a<\/h1>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">\u5927\u81f4\u53ef\u4ee5\u5206\u4e3a3\u4e2a\u9636\u6bb5\uff1a<\/div>\n<div data-type=\"p\"><\/div>\n<ul data-type=\"unordered-list\">\n<li data-type=\"list-item\" data-list-type=\"unordered-list\">\n<h3 id=\"7ncxen\" data-type=\"h\"><a id=\"\u521d\u59cb\u5316\" class=\"anchor\" href=\"#7ncxen\"><\/a>\u521d\u59cb\u5316<\/h3>\n<\/li>\n<li data-type=\"list-item\" data-list-type=\"unordered-list\">\n<h3 id=\"9x4dvv\" data-type=\"h\"><a id=\"\u72b6\u6001\u53d8\u5316\" class=\"anchor\" href=\"#9x4dvv\"><\/a>\u72b6\u6001\u53d8\u5316<\/h3>\n<\/li>\n<li data-type=\"list-item\" data-list-type=\"unordered-list\">\n<h3 id=\"3fq9fi\" data-type=\"h\"><a id=\"\u7ec4\u4ef6\u79fb\u9664\" class=\"anchor\" href=\"#3fq9fi\"><\/a>\u7ec4\u4ef6\u79fb\u9664<\/h3>\n<\/li>\n<\/ul>\n<div data-type=\"p\"><\/div>\n<h2 id=\"r1nffw\" data-type=\"h\"><a id=\"\u521d\u59cb\u5316\" class=\"anchor\" href=\"#r1nffw\"><\/a>\u521d\u59cb\u5316<\/h2>\n<div data-type=\"p\">State\u521d\u59cb\u5316\u65f6\u4f1a\u4f9d\u6b21\u6267\u884c \uff1a \u6784\u9020\u51fd\u6570 &gt; initState &gt; didChangeDependencies &gt; Widget build , \u6b64\u65f6\u9875\u9762\u52a0\u8f7d\u5b8c\u6210\u3002<\/div>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">\u7136\u540e\u6211\u4eec\u770b\u4e00\u4e0b\u6bcf\u4e2a\u51fd\u6570\u7684\u610f\u4e49\uff1a<\/div>\n<div data-type=\"p\"><\/div>\n<h3 id=\"7zt7bk\" data-type=\"h\"><a id=\"\u6784\u9020\u51fd\u6570\" class=\"anchor\" href=\"#7zt7bk\"><\/a>\u6784\u9020\u51fd\u6570<\/h3>\n<div data-type=\"p\">\u8c03\u7528\u6b21\u6570\uff1a1\u6b21<\/div>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">\u8fd9\u4e2a\u51fd\u6570\u4e25\u683c\u610f\u4e49\u4e0a\u6765\u8bb2\u4e0d\u5c5e\u4e8e\u751f\u547d\u5468\u671f\u7684\u4e00\u90e8\u5206\uff0c\u56e0\u4e3a\u8fd9\u4e2a\u65f6\u5019State\u7684widget\u5c5e\u6027\u4e3a\u7a7a\uff0c\u65e0\u6cd5\u5728\u6784\u9020\u51fd\u6570\u4e2d\u8bbf\u95eewidget\u7684\u5c5e\u6027 \u3002\u4f46\u662f\u6784\u9020\u51fd\u6570\u5fc5\u7136\u662f\u8981\u7b2c\u4e00\u4e2a\u8c03\u7528\u7684\u3002\u53ef\u4ee5\u5728\u8fd9\u4e00\u90e8\u5206\u63a5\u6536\u524d\u4e00\u4e2a\u9875\u9762\u4f20\u9012\u8fc7\u6765\u7684\u6570\u636e\u3002<\/div>\n<div data-type=\"p\"><\/div>\n<h3 id=\"gtcyrh\" data-type=\"h\"><a id=\"initstate\" class=\"anchor\" href=\"#gtcyrh\"><\/a>initState<\/h3>\n<div data-type=\"p\">Called when this object is inserted into the tree.<\/div>\n<div data-type=\"p\">\u8c03\u7528\u6b21\u6570\uff1a1\u6b21<\/div>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">\u5f53\u63d2\u5165\u6e32\u67d3\u6811\u7684\u65f6\u5019\u8c03\u7528\uff0c\u8fd9\u4e2a\u51fd\u6570\u5728\u751f\u547d\u5468\u671f\u4e2d\u53ea\u8c03\u7528\u4e00\u6b21\u3002\u8fd9\u91cc\u53ef\u4ee5\u505a\u4e00\u4e9b\u521d\u59cb\u5316\u5de5\u4f5c\uff0c\u6bd4\u5982\u521d\u59cb\u5316State\u7684\u53d8\u91cf\u3002<\/div>\n<div data-type=\"p\"><\/div>\n<h3 id=\"42tkvc\" data-type=\"h\"><a id=\"didchangedependencies\" class=\"anchor\" href=\"#42tkvc\"><\/a>didChangeDependencies<\/h3>\n<div data-type=\"p\">Called when a dependency of this [State] object changes.<\/div>\n<div data-type=\"p\">\u521d\u59cb\u5316\u65f6\uff0c\u5728initState()\u4e4b\u540e\u7acb\u523b\u8c03\u7528<\/div>\n<div data-type=\"p\">\u5f53\u4f9d\u8d56\u7684InheritedWidget rebuild,\u4f1a\u89e6\u53d1\u6b64\u63a5\u53e3\u88ab\u8c03\u7528<\/div>\n<div data-type=\"p\">\u8fd9\u4e2a\u51fd\u6570\u4f1a\u7d27\u8ddf\u5728initState\u4e4b\u540e\u8c03\u7528\uff0c\u5e76\u4e14\u53ef\u4ee5\u8c03\u7528BuildContext.inheritFromWidgetOfExactType\uff0c\u90a3\u4e48BuildContext.inheritFromWidgetOfExactType\u7684\u4f7f\u7528\u573a\u666f\u662f\u4ec0\u4e48\u5462\uff1f\u6700\u7ecf\u5178\u7684\u5e94\u7528\u573a\u666f\u662f<\/div>\n<pre data-syntax=\"ruby\"><code class=\"language-ruby\">new DefaultTabController(length: 3, child: new TabBar(\n      tabs: [ \"\u4e3b\u9875\",\"\u8ba2\u5355\",\"\u6211\u7684\" ]\n      .map( (data)=&gt;new Text(data) ).toList(),\n<\/code><\/pre>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\"><span style=\"color: #4f4f4f;\" data-type=\"color\"><span style=\"background-color: #ffffff;\" data-type=\"background\">TabBar\u672c\u6765\u9700\u8981\u5b9a\u4e49\u4e00\u4e2aTabController,\u4f46\u662f\u5728\u5916\u9762\u5957\u4e00\u5c42DefaultTabController\u5c31\u4e0d\u9700\u8981\u5b9a\u4e49TabContrller\u4e86,\u770b\u4e0b\u6e90\u7801\uff1a<\/span><\/span><\/div>\n<pre data-syntax=\"ruby\"><code class=\"language-ruby\">@override\n  void didChangeDependencies() {\n    super.didChangeDependencies();\n    _updateTabController();\n    _initIndicatorPainter();\n  }\n\nvoid _updateTabController() {\n    final TabController newController = widget.controller ?? DefaultTabController.of(context);\n    ...\n    }\n<\/code><\/pre>\n<div data-type=\"p\"><span style=\"color: #4f4f4f;\" data-type=\"color\"><span style=\"background-color: #ffffff;\" data-type=\"background\">\u6ce8\u610f\u5230\u8fd9\u91ccDefaultTabController.of(context)<\/span><\/span><\/div>\n<pre data-syntax=\"ruby\"><code class=\"language-ruby\">static TabController of(BuildContext context) {\n    final _TabControllerScope scope = context.inheritFromWidgetOfExactType(_TabControllerScope);\n    return scope?.controller;\n  }\n<\/code><\/pre>\n<div data-type=\"p\"><span style=\"color: #4f4f4f;\" data-type=\"color\"><span style=\"background-color: #ffffff;\" data-type=\"background\">\u5b9e\u9645\u4e0a\u5c31\u662f\u8c03\u7528BuildContext.inheritFromWidgetOfExactType\uff0c\u4e5f\u5c31\u8bf4\u5728didChangeDependencies\u4e2d\uff0c\u53ef\u4ee5\u8de8\u7ec4\u4ef6\u62ff\u5230\u6570\u636e\u3002<\/span><\/span><\/div>\n<div data-type=\"p\"><\/div>\n<h2 id=\"b14zlq\" data-type=\"h\"><a id=\"\u8fd0\u884c\u65f6\" class=\"anchor\" href=\"#b14zlq\"><\/a>\u8fd0\u884c\u65f6<\/h2>\n<h3 id=\"42c6gd\" data-type=\"h\"><a id=\"build\" class=\"anchor\" href=\"#42c6gd\"><\/a>build<\/h3>\n<div data-type=\"p\">\u8c03\u7528\u6b21\u6570\uff1a\u591a\u6b21<\/div>\n<div data-type=\"p\">\u521d\u59cb\u5316\u4e4b\u540e\u5f00\u59cb\u7ed8\u5236\u754c\u9762\uff0c\u5f53setState\u89e6\u53d1\u7684\u65f6\u5019\u4f1a\u518d\u6b21\u88ab\u8c03\u7528<\/div>\n<div data-type=\"p\"><\/div>\n<h3 id=\"7epwkd\" data-type=\"h\"><a id=\"didupdatewidget\" class=\"anchor\" href=\"#7epwkd\"><\/a>didUpdateWidget<\/h3>\n<div data-type=\"p\">Called whenever the widget configuration changes.<\/div>\n<div data-type=\"p\">\u7956\u5148\u8282\u70b9rebuild widget\u65f6\u8c03\u7528 .\u5f53\u7ec4\u4ef6\u7684\u72b6\u6001\u6539\u53d8\u7684\u65f6\u5019\u5c31\u4f1a\u8c03\u7528didUpdateWidget.<\/div>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">\u7406\u8bba\u4e0asetState\u7684\u65f6\u5019\u4f1a\u8c03\u7528\uff0c\u4f46\u6211\u5b9e\u9645\u64cd\u4f5c\u7684\u65f6\u5019\u53d1\u73b0<strong>\u53ea\u662f\u505asetState\u7684\u64cd\u4f5c\u7684\u65f6\u5019\u6ca1\u6709\u8c03\u7528\u8fd9\u4e2a\u65b9\u6cd5<\/strong>\u3002\u800c\u5728\u6211<strong>\u6539\u53d8\u4ee3\u7801hot reload\u65f6\u5019\u4f1a\u8c03\u7528 didUpdateWidget \u5e76\u6267\u884c build\u2026<\/strong><\/div>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">\u5b9e\u9645\u4e0a\u8fd9\u91ccflutter\u6846\u67b6\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684Widget,\u7ed1\u5b9a\u672cState\uff0c\u5e76\u5728\u8fd9\u4e2a\u51fd\u6570\u4e2d\u4f20\u9012\u8001\u7684Widget\u3002<\/div>\n<div data-type=\"p\">\u8fd9\u4e2a\u51fd\u6570\u4e00\u822c\u7528\u4e8e\u6bd4\u8f83\u65b0\u3001\u8001Widget\uff0c\u770b\u770b\u54ea\u4e9b\u5c5e\u6027\u6539\u53d8\u4e86\uff0c\u5e76\u5bf9State\u505a\u4e00\u4e9b\u8c03\u6574\u3002<\/div>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u6d89\u53ca\u5230controller\u7684\u53d8\u66f4\uff0c\u9700\u8981\u5728\u8fd9\u4e2a\u51fd\u6570\u4e2d\u79fb\u9664\u8001\u7684controller\u7684\u76d1\u542c\uff0c\u5e76\u521b\u5efa\u65b0controller\u7684\u76d1\u542c\u3002<\/div>\n<div data-type=\"p\"><\/div>\n<h2 id=\"gcmzgq\" data-type=\"h\"><a id=\"\u7ec4\u4ef6\u79fb\u9664\" class=\"anchor\" href=\"#gcmzgq\"><\/a>\u7ec4\u4ef6\u79fb\u9664<\/h2>\n<div data-type=\"p\">\u7ec4\u4ef6\u79fb\u9664\uff0c\u4f8b\u5982\u9875\u9762\u9500\u6bc1\u7684\u65f6\u5019\u4f1a\u4f9d\u6b21\u6267\u884c\uff1adeactivate &gt; dispose<\/div>\n<div data-type=\"p\"><\/div>\n<h3 id=\"kl1gdf\" data-type=\"h\"><a id=\"deactivate\" class=\"anchor\" href=\"#kl1gdf\"><\/a>deactivate<\/h3>\n<div data-type=\"p\">Called when this object is removed from the tree.<\/div>\n<div data-type=\"p\">\u5728dispose\u4e4b\u524d\uff0c\u4f1a\u8c03\u7528\u8fd9\u4e2a\u51fd\u6570\u3002\u5b9e\u6d4b\u5728\u7ec4\u4ef6\u8bfe\u4ef6\u72b6\u6001\u53d8\u5316\u7684\u65f6\u5019\u4f1a\u8c03\u7528\uff0c\u5f53\u7ec4\u4ef6\u5378\u8f7d\u65f6\u4e5f\u4f1a\u5148\u4e00\u6b65dispose\u8c03\u7528\u3002<\/div>\n<div data-type=\"p\"><\/div>\n<h3 id=\"4430li\" data-type=\"h\"><a id=\"dispose\" class=\"anchor\" href=\"#4430li\"><\/a>dispose<\/h3>\n<div data-type=\"p\">Called when this object is removed from the tree permanently.<\/div>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">\u8c03\u7528\u6b21\u6570\uff1a1\u6b21<\/div>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">\u4e00\u65e6\u5230\u8fd9\u4e2a\u9636\u6bb5\uff0c\u7ec4\u4ef6\u5c31\u8981\u88ab\u9500\u6bc1\u4e86\uff0c\u8fd9\u4e2a\u51fd\u6570\u4e00\u822c\u4f1a\u79fb\u9664\u76d1\u542c\uff0c\u6e05\u7406\u73af\u5883\u3002<\/div>\n<div data-type=\"p\"><\/div>\n<h2 id=\"8fyfza\" data-type=\"h\"><a id=\"reassemble\" class=\"anchor\" href=\"#8fyfza\"><\/a>reassemble<\/h2>\n<div data-type=\"p\">hot reload\u8c03\u7528<\/div>\n<div data-type=\"p\"><\/div>\n<div class=\"bi-table\">\n<table>\n<colgroup>\n<col width=\"auto\">\n<col width=\"auto\"> <\/colgroup>\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<div style=\"text-align: center;\" data-type=\"alignment\" data-value=\"center\">\n<div data-type=\"p\"><strong>\u540d\u79f0<\/strong><\/div>\n<\/div>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<div style=\"text-align: center;\" data-type=\"alignment\" data-value=\"center\">\n<div data-type=\"p\"><strong>\u72b6\u6001<\/strong><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<div data-type=\"p\">initState<\/div>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<div data-type=\"p\">\u63d2\u5165\u6e32\u67d3\u6811\u65f6\u8c03\u7528\uff0c\u53ea\u8c03\u7528\u4e00\u6b21<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<div data-type=\"p\">didChangeDependencies<\/div>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<div data-type=\"p\">state\u4f9d\u8d56\u7684\u5bf9\u8c61\u53d1\u751f\u53d8\u5316\u65f6\u8c03\u7528<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<div data-type=\"p\">didUpdateWidget<\/div>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<div data-type=\"p\">\u7ec4\u4ef6\u72b6\u6001\u6539\u53d8\u65f6\u5019\u8c03\u7528\uff0c\u53ef\u80fd\u4f1a\u8c03\u7528\u591a\u6b21<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<div data-type=\"p\">build<\/div>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<div data-type=\"p\">\u6784\u5efaWidget\u65f6\u8c03\u7528<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<div data-type=\"p\">deactivate<\/div>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<div data-type=\"p\">\u5f53\u79fb\u9664\u6e32\u67d3\u6811\u7684\u65f6\u5019\u8c03\u7528<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<div data-type=\"p\">dispose<\/div>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<div data-type=\"p\">\u7ec4\u4ef6\u5373\u5c06\u9500\u6bc1\u65f6\u8c03\u7528<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h1 id=\"eahdzc\" data-type=\"h\"><a id=\"\u5b9e\u9645\u573a\u666f-\" class=\"anchor\" href=\"#eahdzc\"><\/a>\u5b9e\u9645\u573a\u666f<\/h1>\n<div data-type=\"p\">\u5047\u8bbe\u6211\u4eec\u4eceA\u9875\u9762\u8df3\u8f6c\u5230B\u9875\u9762\uff0c \u90a3\u4e48A\uff0cB\u9875\u9762\u7684\u751f\u547d\u5468\u671f\u4f1a\u662f\u600e\u6837\u7684\u5462\uff1f<\/div>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\"><strong>B\u9875\u9762<\/strong>\u8fdb\u5165\u521d\u59cb\u5316\u72b6\u6001\uff0c\u4f9d\u6b21\u6267\u884c4\u4e2a\u51fd\u6570\uff1a\u6784\u9020\u51fd\u6570 &gt; <strong>initState <\/strong>&gt; <strong>didChangeDependencies <\/strong>&gt; W<strong>idget build<\/strong> , \u6b64\u65f6\u9875\u9762\u52a0\u8f7d\u5b8c\u6210,\u8fdb\u5165\u8fd0\u884c\u6001\u3002<\/div>\n<div data-type=\"p\">\u6b64\u65f6A\u9875\u9762\u4f9d\u6b21\u6267\u884c<strong>deactivate<\/strong> &gt; <strong>build<\/strong>\u51fd\u6570\u3002\u6ce8\u610f \u6b64\u65f6A\u9875\u9762\u5e76\u672a\u5378\u8f7d\u3002<\/div>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">\u7136\u540e\u6211\u4eec\u5047\u8bbeB\u9875\u9762\u53ea\u6709\u4e00\u4e2a\u6309\u94ae\uff0c\u70b9\u51fbB\u9875\u9762\u4e2d\u7684\u6309\u94ae\uff0c\u6539\u53d8\u6309\u94ae\u7684\u6587\u5b57\uff0c\u4f1a\u6267\u884cwidget\u7684build\u65b9\u6cd5 \uff0c(\u7406\u8bba\u4e0a\u4e5f\u5e94\u8be5\u6267\u884cdidUpdateWidget\uff0c\u4f46\u6211\u8fd9\u91cc\u6ca1\u6709)\u3002<\/div>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">\u8fd9\u65f6\uff0c\u6211\u4eec\u70b9\u51fb\u8fd4\u56de\u952e\u4eceB\u9875\u9762\u8fd4\u56de\u5230A\u9875\u9762\u3002<\/div>\n<div data-type=\"p\">A\u9875\u9762\u91cd\u65b0\u663e\u793a\uff0cB\u9875\u9762\u5f00\u59cb\u5378\u8f7d\u3002<\/div>\n<div data-type=\"p\">\u90a3\u4e48A\u5148\u6267\u884cdeactivate &gt; build \uff0c \u7136\u540eB\u9875\u9762\u4f9d\u6b21\u6267\u884c\uff1adeactivate &gt; dispose \u3002<\/div>\n<div data-type=\"p\">\u6b64\u65f6A\u9875\u9762\u8fdb\u5165\u8fd0\u884c\u6001\uff0cB\u9875\u9762\u79fb\u9664\u3002<\/div>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">\u672c\u6b21\u793a\u4f8bB\u9875\u9762\u4ee3\u7801\uff1a<\/div>\n<pre data-syntax=\"ruby\"><code class=\"language-ruby\"> \/*\n * Created by \u674e\u5353\u539f on 2018\/9\/13.\n * email: zhuoyuan93@gmail.com\n *\n *\/\n\nimport 'package:flutter\/material.dart';\n\nclass NewsDetailPage extends StatefulWidget {\n  @override\n  State&lt;StatefulWidget&gt; createState() =&gt; NewsDetailState();\n}\n\nclass NewsDetailState extends State&lt;NewsDetailPage&gt; {\n  int text = 1;\n\n  NewsDetailState() {\n    print('\u6784\u9020\u51fd\u6570');\n  }\n\n  @override\n  void initState() {\n    print('init state');\n    super.initState();\n  }\n\n  @override\n  void didChangeDependencies() {\n    print('didChangeDependencies');\n    super.didChangeDependencies();\n  }\n\n  @override\n  Widget build(BuildContext context) {\n    print('widget build');\n\n    return Scaffold(\n      body: Center(\n        child: _loading(),\n      ),\n      appBar: AppBar(\n        title: Text('\u54a8\u8be2\u8be6\u60c5'),\n      ),\n    );\n  }\n\n  @override\n  void didUpdateWidget(NewsDetailPage oldWidget) {\n    print('\u7ec4\u4ef6\u72b6\u6001\u6539\u53d8\uff1adidUpdateWidget');\n    super.didUpdateWidget(oldWidget);\n  }\n\n  @override\n  void deactivate() {\n    print('\u79fb\u9664\u65f6\uff1adeactivate');\n    super.deactivate();\n  }\n\n  @override\n  void dispose() {\n    print('\u79fb\u9664\u65f6\uff1adispose');\n    super.dispose();\n  }\n\n  \/\/\u9884\u52a0\u8f7d\u5e03\u5c40\n  Widget _loading() {\n    return Column(\n      mainAxisAlignment: MainAxisAlignment.center,\n      children: &lt;Widget&gt;[\n        CircularProgressIndicator(\n          strokeWidth: 1.0,\n        ),\n        Container(\n          child: Text(\"\u6b63\u5728\u52a0\u8f7d\"),\n          margin: EdgeInsets.only(top: 10.0),\n        )\n      ],\n    );\n  }\n}\n<\/code><\/pre>\n<div data-type=\"p\"><\/div>\n<h2 id=\"dgmnig\" data-type=\"h\"><a id=\"-tips:\" class=\"anchor\" href=\"#dgmnig\"><\/a> Tips:<\/h2>\n<div data-type=\"p\">\u4e0b\u9762\u5185\u5bb9\u6765\u81ea\u54b8\u9c7c\u6280\u672f\u56e2\u961f.<\/div>\n<blockquote>\n<div data-type=\"p\">\u5f53ListView\u4e2d\u7684item\u6eda\u52a8\u51fa\u53ef\u663e\u793a\u533a\u57df\u7684\u65f6\u5019\uff0citem\u4f1a\u88ab\u4ece\u6811\u4e2dremove\u6389\uff0c\u6b64item\u5b50\u6811\u4e2d\u6240\u6709\u7684state\u90fd\u4f1a\u88abdispose\uff0cstate\u8bb0\u5f55\u7684\u6570\u636e\u90fd\u4f1a\u9500\u6bc1\uff0citem\u6eda\u52a8\u56de\u53ef\u663e\u793a\u533a\u57df\u65f6\uff0c\u4f1a\u91cd\u65b0\u521b\u5efa\u5168\u65b0\u7684state\u3001element\u3001renderobject<\/div>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">\u4f7f\u7528hot reload\u529f\u80fd\u65f6\uff0c\u8981\u7279\u522b\u6ce8\u610fstate\u5b9e\u4f8b\u662f\u6ca1\u6709\u91cd\u65b0\u521b\u5efa\u7684\uff0c\u5982\u679c\u8be5state\u4e2d\u5b58\u5728\u4e00\u4e0b\u590d\u6742\u7684\u8d44\u6e90\u66f4\u65b0\u9700\u8981\u91cd\u65b0\u52a0\u8f7d\u624d\u80fd\u751f\u6548\uff0c\u90a3\u4e48\u9700\u8981\u5728reassemble()\u6dfb\u52a0\u5904\u7406\uff0c\u4e0d\u7136\u5f53\u4f60\u4f7f\u7528hot reload\u65f6\u5019\u53ef\u80fd\u4f1a\u51fa\u73b0\u4e00\u4e9b\u610f\u60f3\u4e0d\u5230\u7684\u7ed3\u679c\uff0c\u4f8b\u5982\uff0c\u8981\u5c06\u663e\u793a\u672c\u5730\u6587\u4ef6\u7684\u5185\u5bb9\u5230\u5c4f\u5e55\u4e0a\uff0c\u5f53\u4f60\u5f00\u53d1\u8fc7\u7a0b\u4e2d\uff0c\u66ff\u6362\u4e86\u6587\u4ef6\u4e2d\u7684\u5185\u5bb9\uff0c\u4f46\u662fhot reload\u6ca1\u6709\u89e6\u53d1\u91cd\u65b0\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9\uff0c\u9875\u9762\u663e\u793a\u8fd8\u662f\u539f\u6765\u7684\u65e7\u5185\u5bb9.<\/div>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">idChangeDependencies\u6709\u4e24\u79cd\u60c5\u51b5\u4f1a\u88ab\u8c03\u7528\u3002<\/div>\n<div data-type=\"p\">\u521b\u5efa\u65f6\u5019\u5728initState \u4e4b\u540e\u88ab\u8c03\u7528<\/div>\n<div data-type=\"p\">\u5728\u4f9d\u8d56\u7684InheritedWidget\u53d1\u751f\u53d8\u5316\u7684\u65f6\u5019\u4f1a\u88ab\u8c03\u7528<\/div>\n<div data-type=\"p\">\u6b63\u5e38\u7684\u9000\u51fa\u6d41\u7a0b\u4e2d\u4f1a\u6267\u884cdeactivate\u7136\u540e\u6267\u884cdispose\u3002\u4f46\u662f\u4e5f\u4f1a\u51fa\u73b0deactivate\u4ee5\u540e\u4e0d\u6267\u884cdispose\uff0c\u76f4\u63a5\u52a0\u5165\u6811\u4e2d\u7684\u53e6\u4e00\u4e2a\u8282\u70b9\u7684\u60c5\u51b5\u3002<\/div>\n<div data-type=\"p\">\u8fd9\u91cc\u7684\u72b6\u6001\u6539\u53d8\u5305\u62ec\u4e24\u79cd\u53ef\u80fd\uff1a<\/div>\n<div data-type=\"p\">1.\u901a\u8fc7setState\u5185\u5bb9\u6539\u53d8<\/div>\n<div data-type=\"p\">2.\u7236\u8282\u70b9\u7684state\u72b6\u6001\u6539\u53d8\uff0c\u5bfc\u81f4\u5b69\u5b50\u8282\u70b9\u7684\u540c\u6b65\u53d8\u5316\u3002<\/div>\n<\/blockquote>\n<div data-type=\"p\"><\/div>\n<h1 id=\"zm9hoc\" data-type=\"h\"><a id=\"app\u751f\u547d\u5468\u671f\" class=\"anchor\" href=\"#zm9hoc\"><\/a>App\u751f\u547d\u5468\u671f<\/h1>\n<div data-type=\"p\">\u9700\u8981\u6307\u51fa\u7684\u662f\u5982\u679c\u60f3\u8981\u77e5\u9053App\u7684\u751f\u547d\u5468\u671f,\u90a3\u4e48\u9700\u8981\u901a\u8fc7WidgetsBindingObserver\u7684didChangeAppLifecycleState \u6765\u83b7\u53d6\u3002\u901a\u8fc7\u8be5\u63a5\u53e3\u53ef\u4ee5\u83b7\u53d6\u662f\u751f\u547d\u5468\u671f\u5728AppLifecycleState\u7c7b\u4e2d\u3002\u5e38\u7528\u72b6\u6001\u5305\u542b\u5982\u4e0b\u51e0\u4e2a\uff1a<\/div>\n<div data-type=\"p\"><\/div>\n<div class=\"bi-table\">\n<table>\n<colgroup>\n<col width=\"auto\">\n<col width=\"auto\"> <\/colgroup>\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<div data-type=\"p\">\u540d\u79f0<\/div>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<div data-type=\"p\">\u72b6\u6001<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<div data-type=\"p\">resumed<\/div>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<div data-type=\"p\">\u53ef\u89c1\u5e76\u80fd\u54cd\u5e94\u7528\u6237\u7684\u8f93\u5165<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<div data-type=\"p\">inactive<\/div>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<div data-type=\"p\">\u5904\u5728\u5e76\u4e0d\u6d3b\u52a8\u72b6\u6001\uff0c\u65e0\u6cd5\u5904\u7406\u7528\u6237\u54cd\u5e94<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\">\n<div data-type=\"p\">paused<\/div>\n<\/td>\n<td colspan=\"1\" rowspan=\"1\">\n<div data-type=\"p\">\u4e0d\u53ef\u89c1\u5e76\u4e0d\u80fd\u54cd\u5e94\u7528\u6237\u7684\u8f93\u5165\uff0c\u4f46\u662f\u5728\u540e\u53f0\u7ee7\u7eed\u6d3b\u52a8\u4e2d<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div data-type=\"p\">\u4e00\u4e2a\u5b9e\u9645\u573a\u666f\u4e2d\u7684\u4f8b\u5b50\uff1a<\/div>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">\u5728\u4e0d\u8003\u8651suspending\u7684\u60c5\u51b5\u4e0b\uff1a<\/div>\n<div data-type=\"p\">\u4ece\u540e\u53f0\u5207\u5165\u524d\u53f0\u751f\u547d\u5468\u671f\u53d8\u5316\u5982\u4e0b:<strong> AppLifecycleState.inactive<\/strong>-&gt;<strong>AppLifecycleState.resumed;<\/strong><\/div>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">\u4ece\u524d\u53f0\u538b\u540e\u53f0\u751f\u547d\u5468\u671f\u53d8\u5316\u5982\u4e0b\uff1a<strong> AppLifecycleState.inactive<\/strong>-&gt;<strong>AppLifecycleState.paused;<br \/>\n<\/strong><\/div>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\"><\/div>\n<hr id=\"4ev3ob\">\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\"><a class=\"bi-link\" href=\"https:\/\/www.imooc.com\/article\/68585\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">\u539f\u6587\u7ae0\u5f15\u7528\u81ea<\/a><\/div>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">\u672c\u6587\u4e3b\u8981\u68b3\u7406\u4e00\u4e0bStatefulWidget\u548cStatelessWidget\u7684\u751f\u547d\u5468\u671f<\/div>\n<div data-type=\"p\">\n<div data-type=\"image\" data-display=\"block\" data-align=\"left\" data-src=\"https:\/\/ws3.sinaimg.cn\/large\/006tNbRwgy1fubxa62m44j31fe0suqbn.jpg\" data-width=\"\"><img decoding=\"async\" src=\"https:\/\/ws3.sinaimg.cn\/large\/006tNbRwgy1fubxa62m44j31fe0suqbn.jpg\" width=\"\"><\/div>\n<\/div>\n<h1 id=\"odn9dy\" data-type=\"h\"><a id=\"\u5fae\u7ec4\u4ef6\" class=\"anchor\" href=\"#odn9dy\"><\/a>\u5fae\u7ec4\u4ef6<\/h1>\n<h2 id=\"py2viy\" data-type=\"h\"><a id=\"statelesswidget\" class=\"anchor\" href=\"#py2viy\"><\/a>StatelessWidget<\/h2>\n<div data-type=\"p\"><\/div>\n<ol start=\"1\" data-type=\"unordered-list\">\n<li data-type=\"list-item\" data-list-type=\"unordered-list\">\n<div data-type=\"p\">\u63a5\u6536\u5916\u90e8\u6570\u636e<\/div>\n<\/li>\n<li data-type=\"list-item\" data-list-type=\"unordered-list\">\n<div data-type=\"p\">\u6267\u884c\u90e8\u4ef6\u6784\u9020\u65b9\u6cd5<\/div>\n<\/li>\n<li data-type=\"list-item\" data-list-type=\"unordered-list\">\n<div data-type=\"p\">\u5f53<strong>\u4f20\u5165\u6570\u636e<\/strong>\u6539\u53d8\u65f6\u4f1a\u91cd\u65b0\u6e32\u67d3UI<\/div>\n<div data-type=\"p\"><\/div>\n<\/li>\n<\/ol>\n<h2 id=\"xfyzcm\" data-type=\"h\"><a id=\"statefulwidget\" class=\"anchor\" href=\"#xfyzcm\"><\/a>StatefulWidget<\/h2>\n<ol start=\"1\" data-type=\"unordered-list\">\n<li data-type=\"list-item\" data-list-type=\"unordered-list\">\n<div data-type=\"p\">\u63a5\u6536\u5916\u90e8\u6570\u636e<\/div>\n<\/li>\n<li data-type=\"list-item\" data-list-type=\"unordered-list\">\n<div data-type=\"p\">\u6267\u884c\u90e8\u4ef6\u6784\u9020\u65b9\u6cd5\u548c\u72b6\u6001\u521d\u59cb\u5316\u65b9\u6cd5<\/div>\n<\/li>\n<li data-type=\"list-item\" data-list-type=\"unordered-list\">\n<div data-type=\"p\">\u5f53<strong>\u4f20\u5165\u6570\u636e<\/strong>\u548c&nbsp;<strong>\u672c\u7c7b\u6570\u636e<\/strong>\u6539\u53d8\u65f6\u90fd\u4f1a\u91cd\u65b0\u6e32\u67d3UI<\/div>\n<\/li>\n<\/ol>\n<div data-type=\"p\">\n<div data-type=\"image\" data-display=\"block\" data-align=\"left\" data-src=\"https:\/\/ws4.sinaimg.cn\/large\/006tNbRwgy1fubxv6kljoj31e80segsk.jpg\" data-width=\"\"><img decoding=\"async\" src=\"https:\/\/ws4.sinaimg.cn\/large\/006tNbRwgy1fubxv6kljoj31e80segsk.jpg\" width=\"\"><\/div>\n<\/div>\n<div data-type=\"p\">\u8fd9\u7528\u5230\u4e4b\u524d\u5199\u7684\u4e00\u4e2a\u4f8b\u5b50<a class=\"bi-link\" href=\"https:\/\/gitee.com\/Royce_he\/Flutter_DayByDay\/tree\/master\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">01_widget_basic<\/a><br \/>\n\u7b2c\u4e00\u6b21\u8fd0\u884c\u9879\u76ee<\/p>\n<div data-type=\"image\" data-display=\"block\" data-align=\"left\" data-src=\"https:\/\/ws1.sinaimg.cn\/large\/006tNbRwgy1fubxg477jmj30ji05w0u2.jpg\" data-width=\"\"><img decoding=\"async\" src=\"https:\/\/ws1.sinaimg.cn\/large\/006tNbRwgy1fubxg477jmj30ji05w0u2.jpg\" width=\"\"><\/div>\n<\/div>\n<div data-type=\"p\"><\/div>\n<ol start=\"1\" data-type=\"unordered-list\">\n<li data-type=\"list-item\" data-list-type=\"unordered-list\">\n<div data-type=\"p\">ProductsManager\u90e8\u4ef6\u521d\u59cb\u5316<\/div>\n<\/li>\n<li data-type=\"list-item\" data-list-type=\"unordered-list\">\n<div data-type=\"p\">\u521b\u5efaProductsManagerState<\/div>\n<\/li>\n<li data-type=\"list-item\" data-list-type=\"unordered-list\">\n<div data-type=\"p\">\u8c03\u7528ProductsManagerState\u4e2d\u7684initState\u65b9\u6cd5<\/div>\n<\/li>\n<li data-type=\"list-item\" data-list-type=\"unordered-list\">\n<div data-type=\"p\">ProductsManagerState\u6e32\u67d3<\/div>\n<\/li>\n<li data-type=\"list-item\" data-list-type=\"unordered-list\">\n<div data-type=\"p\">Products\u90e8\u4ef6\u521d\u59cb\u5316<\/div>\n<\/li>\n<li data-type=\"list-item\" data-list-type=\"unordered-list\">\n<div data-type=\"p\">Products\u6e32\u67d3<br \/>\n\u5f53\u70b9\u51fbadd product\u6309\u94ae\u6570\u636e\u53d1\u751f\u6539\u53d8\u65f6<br \/>\n1.\u6570\u636e_products\u53d1\u751f\u4e86\u53d8\u5316 \u901a\u8fc7setState\u65b9\u6cd5\u901a\u77e5\u6570\u636e\u53d1\u751f\u4e86\u6539\u53d8 ProductsManagerState build\u65b9\u6cd5\u88ab\u8c03\u7528<\/div>\n<\/li>\n<li data-type=\"list-item\" data-list-type=\"unordered-list\">\n<div data-type=\"p\">\u800cProducts\u8fdb\u884c\u4e86\u91cd\u65b0\u6784\u9020,\u4e5f\u5c31\u662f\u8bf4\u5f53\u5916\u90e8\u6570\u636e\u53d8\u5316\u65f6 Products\u4e2d\u7684 _products \u76f4\u63a5\u88ab\u66ff\u6362\u6210\u4f20\u5165\u7684\u65b0\u6570\u636e\u800c\u4e0d\u662f\u5728\u4fee\u6539\u539f\u6709\u6570\u636e<\/div>\n<\/li>\n<\/ol>\n<div data-type=\"p\">\n<div data-type=\"image\" data-display=\"block\" data-align=\"left\" data-src=\"https:\/\/ws1.sinaimg.cn\/large\/006tNbRwgy1fubxmh242ij30i803m74t.jpg\" data-width=\"\"><img decoding=\"async\" src=\"https:\/\/ws1.sinaimg.cn\/large\/006tNbRwgy1fubxmh242ij30i803m74t.jpg\" width=\"\"><\/div>\n<\/div>\n<blockquote>\n<div data-type=\"p\">flutter\u62e5\u6709\u7c7b\u4f3c\u4e8ereact-native\u7684\u72b6\u6001\u673a\u5237\u65b0\u673a\u5236,\u5f97\u76ca\u4e8e\u5206\u79bb\u51fa\u4e86StatelessWidget\u548cStatefulWidget,\u8d44\u6e90\u5206\u914d\u66f4\u52a0\u5408\u7406\u7684\u4e86,\u4ee3\u7801\u601d\u8def\u4e5f\u6e05\u6670\u5f88\u591a.<\/div>\n<\/blockquote>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\"><span style=\"color: #2f2f2f;\" data-type=\"color\"><span style=\"background-color: #ffffff;\" data-type=\"background\">lutter\u4e2d\u7684\u89c6\u56feWidget\u50cfAndroid\u4e2d\u7684Activity\u4e00\u6837\u5b58\u5728\u751f\u547d\u5468\u671f\uff0c\u751f\u547d\u5468\u671f\u7684\u56de\u8c03\u51fd\u6570\u4f53\u90fd\u5728State\u4e2d\u3002<\/span><\/span><\/div>\n<div data-type=\"p\"><\/div>\n<hr id=\"57b5tu\">\n<h1 id=\"o6icxn\" data-type=\"h\"><a id=\"span,[object-object],-,span,[object-object],span,[object-object],\u7ec4\u4ef6state\u7684\u751f\u547d\u5468\u671f\u6574\u7406\uff1a\" class=\"anchor\" href=\"#o6icxn\"><\/a><br \/>\n<span style=\"color: #2f2f2f;\" data-type=\"color\"><span style=\"background-color: #ffffff;\" data-type=\"background\">\u7ec4\u4ef6State\u7684\u751f\u547d\u5468\u671f\u6574\u7406\uff1a<\/span><\/span><\/h1>\n<h2 id=\"bbw3bi\" data-type=\"h\"><a id=\"\u521b\u5efa\u9636\u6bb5\" class=\"anchor\" href=\"#bbw3bi\"><\/a>\u521b\u5efa\u9636\u6bb5<\/h2>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">Log\u6240\u793a\uff1a<\/div>\n<div data-type=\"p\">\n<div data-type=\"image\" data-display=\"block\" data-align=\"left\" data-src=\"\/\/upload-images.jianshu.io\/upload_images\/2751425-f20d658da12c295e.png?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/814\/format\/webp\" data-width=\"\"><img decoding=\"async\" src=\"\/\/upload-images.jianshu.io\/upload_images\/2751425-f20d658da12c295e.png?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/814\/format\/webp\" width=\"\"><\/div>\n<\/div>\n<div data-type=\"p\">image.png<\/div>\n<div data-type=\"p\"><\/div>\n<h2 id=\"3454yy\" data-type=\"h\"><a id=\"widget\u72b6\u6001\u6539\u53d8\" class=\"anchor\" href=\"#3454yy\"><\/a>Widget\u72b6\u6001\u6539\u53d8<\/h2>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">\u64cd\u4f5c\uff1a\u6a2a\u7ad6\u5c4f\u5207\u6362<br \/>\nLog\u6240\u793a\uff1a<br \/>\n\u5176\u4ed6\u751f\u547d\u5468\u671f\u5e76\u6ca1\u6709\u6267\u884c<br \/>\n\u7ad6\u5c4f\u5207\u6362\u5230\u6a2a\u5c4f\u6267\u884c2\u6b21<br \/>\n\u6a2a\u5c4f\u5207\u6362\u5230\u7ad6\u5c4f\u6267\u884c2\u6b21<\/div>\n<div data-type=\"p\">\n<div data-type=\"image\" data-display=\"block\" data-align=\"left\" data-src=\"\/\/upload-images.jianshu.io\/upload_images\/2751425-38960743e5aa6646.png?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/984\/format\/webp\" data-width=\"\"><img decoding=\"async\" src=\"\/\/upload-images.jianshu.io\/upload_images\/2751425-38960743e5aa6646.png?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/984\/format\/webp\" width=\"\"><\/div>\n<\/div>\n<div data-type=\"p\">image.png<\/div>\n<div data-type=\"p\"><\/div>\n<h2 id=\"pzt6cn\" data-type=\"h\"><a id=\"app\u5207\u540e\u53f0\uff0c\u518d\u5207\u56de\u6765\" class=\"anchor\" href=\"#pzt6cn\"><\/a>App\u5207\u540e\u53f0\uff0c\u518d\u5207\u56de\u6765<\/h2>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">Log\u6240\u793a\uff1a<\/div>\n<div data-type=\"p\">\n<div data-type=\"image\" data-display=\"block\" data-align=\"left\" data-src=\"\/\/upload-images.jianshu.io\/upload_images\/2751425-15862055226a2efb.png?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/830\/format\/webp\" data-width=\"\"><img decoding=\"async\" src=\"\/\/upload-images.jianshu.io\/upload_images\/2751425-15862055226a2efb.png?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/830\/format\/webp\" width=\"\"><\/div>\n<\/div>\n<div data-type=\"p\">image.png<\/div>\n<div data-type=\"p\"><\/div>\n<h2 id=\"3p09dc\" data-type=\"h\"><a id=\"\u9500\u6bc1\u9636\u6bb5\" class=\"anchor\" href=\"#3p09dc\"><\/a>\u9500\u6bc1\u9636\u6bb5<\/h2>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">Log\u6240\u793a\uff1a<\/div>\n<div data-type=\"p\">\n<div data-type=\"image\" data-display=\"block\" data-align=\"left\" data-src=\"\/\/upload-images.jianshu.io\/upload_images\/2751425-844423198458a8e5.png?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/676\/format\/webp\" data-width=\"\"><img decoding=\"async\" src=\"\/\/upload-images.jianshu.io\/upload_images\/2751425-844423198458a8e5.png?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/676\/format\/webp\" width=\"\"><\/div>\n<\/div>\n<div data-type=\"p\">image.png<\/div>\n<div data-type=\"p\"><\/div>\n<div data-type=\"p\">\u6d41\u7a0b\u5982\u56fe\uff1a<\/div>\n<div data-type=\"p\">\n<div data-type=\"image\" data-display=\"block\" data-align=\"left\" data-src=\"\/\/upload-images.jianshu.io\/upload_images\/2751425-ae1b771bf9841dc8.png?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/856\/format\/webp\" data-width=\"\"><img decoding=\"async\" src=\"\/\/upload-images.jianshu.io\/upload_images\/2751425-ae1b771bf9841dc8.png?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/856\/format\/webp\" width=\"\"><\/div>\n<\/div>\n<div data-type=\"p\">image.png<\/div>\n<h3 id=\"i74uot\" data-type=\"h\"><\/h3>\n<div data-type=\"p\"><\/div>\n<pre data-syntax=\"ruby\"><code class=\"language-ruby\">import 'package:flutter\/material.dart';\n\nclass LifecycleAppPage extends StatefulWidget {\n  @override\n  State&lt;StatefulWidget&gt; createState() {\n    return new _LifecycleAppPageState('\u6784\u9020\u51fd\u6570');\n  }\n}\n\nclass _LifecycleAppPageState extends State&lt;LifecycleAppPage&gt;\n    with WidgetsBindingObserver {\n  String str;\n\n  int count = 0;\n\n  _LifecycleAppPageState(this.str);\n\n  @override\n  void initState() {\n    print(str);\n    print('initState');\n    super.initState();\n    WidgetsBinding.instance.addObserver(this);\n  }\n\n  @override\n  void didChangeDependencies() {\n    print('didChangeDependencies');\n    super.didChangeDependencies();\n  }\n\n  @override\n  void didUpdateWidget(LifecycleAppPage oldWidget) {\n    print('didUpdateWidget');\n    super.didUpdateWidget(oldWidget);\n  }\n\n  @override\n  void deactivate() {\n    print('deactivate');\n    super.deactivate();\n  }\n\n  @override\n  void dispose() {\n    print('dispose');\n    WidgetsBinding.instance.removeObserver(this);\n    super.dispose();\n  }\n\n  @override\n  void didChangeAppLifecycleState(AppLifecycleState state) {\n    switch (state) {\n      case AppLifecycleState.inactive:\n        print('AppLifecycleState.inactive');\n        break;\n      case AppLifecycleState.paused:\n        print('AppLifecycleState.paused');\n        break;\n      case AppLifecycleState.resumed:\n        print('AppLifecycleState.resumed');\n        break;\n      case AppLifecycleState.suspending:\n        print('AppLifecycleState.suspending');\n        break;\n    }\n\n    super.didChangeAppLifecycleState(state);\n  }\n\n  @override\n  Widget build(BuildContext context) {\n    print('build');\n    return new Scaffold(\n      appBar: new AppBar(\n        title: new Text('lifecycle \u5b66\u4e60'),\n        centerTitle: true,\n      ),\n      body: new OrientationBuilder(\n        builder: (context, orientation) {\n          return new Center(\n            child: new Text(\n              '\u5f53\u524d\u8ba1\u6570\u503c\uff1a$count',\n              style: new TextStyle(\n                  color: orientation == Orientation.portrait\n                      ? Colors.blue\n                      : Colors.red),\n            ),\n          );\n        },\n      ),\n      floatingActionButton: new FloatingActionButton(\n          child: new Text('click'),\n          onPressed: () {\n            count++;\n            setState(() {});\n          }),\n    );\n  }\n}\n\nclass LifecyclePage extends StatelessWidget {\n  @override\n  Widget build(BuildContext context) {\n    \/\/ TODO: implement build\n    return new Scaffold(\n      body: new LifecycleAppPage(),\n    );\n  }\n}\n\n\n<\/code><\/pre>\n<div data-type=\"p\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u524d\u8a00\uff1a \u751f\u547d\u5468\u671f\u662f\u4e00\u4e2a\u7ec4\u4ef6\u52a0\u8f7d\u5230\u5378\u8f7d\u7684\u6574\u4e2a\u5468\u671f\uff0c\u719f\u6089\u751f\u547d\u5468\u671f\u53ef\u4ee5\u8ba9\u6211\u4eec\u5728\u5408\u9002\u7684\u65f6\u673a\u505a\u8be5\u505a\u7684\u4e8b\u60c5\uff0c&nbsp;  [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":105,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[5],"series":[23],"class_list":{"0":"post-104","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","6":"hentry","7":"category-flutterstudys","8":"tag-flutter","9":"series-flutter","11":"post-with-thumbnail","12":"post-with-thumbnail-large"},"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.tairongkj.com\/index.php?rest_route=\/wp\/v2\/posts\/104","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tairongkj.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tairongkj.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tairongkj.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tairongkj.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=104"}],"version-history":[{"count":2,"href":"https:\/\/www.tairongkj.com\/index.php?rest_route=\/wp\/v2\/posts\/104\/revisions"}],"predecessor-version":[{"id":107,"href":"https:\/\/www.tairongkj.com\/index.php?rest_route=\/wp\/v2\/posts\/104\/revisions\/107"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.tairongkj.com\/index.php?rest_route=\/wp\/v2\/media\/105"}],"wp:attachment":[{"href":"https:\/\/www.tairongkj.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=104"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tairongkj.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=104"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tairongkj.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=104"},{"taxonomy":"series","embeddable":true,"href":"https:\/\/www.tairongkj.com\/index.php?rest_route=%2Fwp%2Fv2%2Fseries&post=104"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}