{"id":687,"date":"2025-12-09T17:28:53","date_gmt":"2025-12-09T09:28:53","guid":{"rendered":"https:\/\/www.52runoob.com\/?p=687"},"modified":"2025-12-09T17:28:53","modified_gmt":"2025-12-09T09:28:53","slug":"%e9%b8%bf%e8%92%99%e4%b8%adstate%e7%9a%84%e5%8e%9f%e7%90%86%e4%bd%bf%e7%94%a8%e8%af%a6%e8%a7%a3harmonyos-5","status":"publish","type":"post","link":"https:\/\/www.52runoob.com\/index.php\/2025\/12\/09\/%e9%b8%bf%e8%92%99%e4%b8%adstate%e7%9a%84%e5%8e%9f%e7%90%86%e4%bd%bf%e7%94%a8%e8%af%a6%e8%a7%a3harmonyos-5\/","title":{"rendered":"\u9e3f\u8499\u4e2d@State\u7684\u539f\u7406\u4f7f\u7528\u8be6\u89e3(HarmonyOS\u00a05)"},"content":{"rendered":"\n<p>\u4e0b\u9762\u7ed9\u4f60\u6574\u7406\u4e00\u4efd <strong>\u300aHarmonyOS 5 @State \u539f\u7406\u4e0e\u4f7f\u7528\u8be6\u89e3\u300b<\/strong>\uff0c\u5305\u542b\u6982\u5ff5\u3001\u5de5\u4f5c\u539f\u7406\u3001\u4f7f\u7528\u65b9\u6cd5\u4ee5\u53ca\u6700\u4f73\u5b9e\u8df5\uff0c\u9002\u5408\u524d\u7aef\u5f00\u53d1\u8005\u5728 AbilitySlice \/ Composable \u573a\u666f\u4e2d\u5feb\u901f\u638c\u63e1\u72b6\u6001\u7ba1\u7406\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\"><strong>HarmonyOS 5 @State \u539f\u7406\u4e0e\u4f7f\u7528\u8be6\u89e3<\/strong><\/h1>\n\n\n\n<p>\u5728 HarmonyOS 5\uff08\u57fa\u4e8e ArkUI \u6846\u67b6\uff09\u4e2d\uff0c<code>@State<\/code> \u662f\u6700\u6838\u5fc3\u7684\u72b6\u6001\u7ba1\u7406\u6ce8\u89e3\uff0c\u7528\u4e8e\u54cd\u5e94\u5f0f UI \u66f4\u65b0\u3002\u7406\u89e3\u5b83\u7684\u539f\u7406\uff0c\u6709\u52a9\u4e8e\u9ad8\u6548\u7f16\u5199\u53ef\u7ef4\u62a4\u7684\u9875\u9762\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\"><strong>\u4e00\u3001@State \u57fa\u672c\u6982\u5ff5<\/strong><\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5b9a\u4e49<\/strong>\uff1a<code>@State<\/code> \u7528\u4e8e\u6807\u8bb0 <strong>\u53ef\u53d8\u7684\u3001\u4f1a\u89e6\u53d1 UI \u66f4\u65b0\u7684\u5c5e\u6027<\/strong><\/li>\n\n\n\n<li><strong>\u4f5c\u7528<\/strong>\uff1a\u5f53\u6807\u8bb0\u7684\u53d8\u91cf\u6539\u53d8\u65f6\uff0c\u6846\u67b6\u4f1a\u81ea\u52a8 <strong>\u91cd\u65b0\u6e32\u67d3\u76f8\u5173 Composable \u7ec4\u4ef6<\/strong><\/li>\n\n\n\n<li><strong>\u9002\u7528\u573a\u666f<\/strong>\uff1aUI \u9875\u9762\u4e2d\u7684\u6309\u94ae\u72b6\u6001\u3001\u8f93\u5165\u6846\u5185\u5bb9\u3001\u5217\u8868\u6570\u636e\u7b49<\/li>\n<\/ul>\n\n\n\n<p>\u793a\u4f8b\uff1a<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n@State\nvar counter = 0\n\n<\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\"><strong>\u4e8c\u3001@State \u5de5\u4f5c\u539f\u7406<\/strong><\/h1>\n\n\n\n<p>HarmonyOS 5 \u7684 <code>@State<\/code> \u80cc\u540e\u662f <strong>\u54cd\u5e94\u5f0f\u6570\u636e\u673a\u5236<\/strong>\uff0c\u539f\u7406\u5982\u4e0b\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u6570\u636e\u52ab\u6301<\/strong>\n<ul class=\"wp-block-list\">\n<li><code>@State<\/code> \u6807\u8bb0\u7684\u53d8\u91cf\u5728\u7f16\u8bd1\u65f6\u88ab\u5305\u88c5\u6210 <strong>\u53ef\u89c2\u5bdf\u5bf9\u8c61<\/strong><\/li>\n\n\n\n<li>\u5185\u90e8\u4f1a\u62e6\u622a <strong>get\/set<\/strong> \u65b9\u6cd5<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u4f9d\u8d56\u6536\u96c6<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5f53 Composable \u4f7f\u7528\u8be5\u53d8\u91cf\u65f6\uff0c\u4f1a\u8bb0\u5f55\u8be5\u7ec4\u4ef6\u5bf9\u53d8\u91cf\u7684\u4f9d\u8d56\u5173\u7cfb<\/li>\n\n\n\n<li>\u4f8b\u5982\uff1a<code>Text(counter.toString())<\/code> \u4f1a\u8ba2\u9605 <code>counter<\/code><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u72b6\u6001\u53d8\u66f4\u89e6\u53d1<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u53d8\u91cf\u8d4b\u503c\u65f6\uff0c\u4f1a\u89e6\u53d1\u4f9d\u8d56\u6536\u96c6\u7684\u7ec4\u4ef6\u91cd\u65b0\u6267\u884c\u6e32\u67d3\u903b\u8f91<\/li>\n\n\n\n<li>\u7c7b\u4f3c Jetpack Compose \u7684 StateFlow \/ SwiftUI \u7684 @State<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u589e\u91cf\u6e32\u67d3<\/strong>\n<ul class=\"wp-block-list\">\n<li>HarmonyOS \u53ea\u4f1a\u66f4\u65b0\u53d7\u5f71\u54cd\u7684\u7ec4\u4ef6\uff0c\u800c\u4e0d\u662f\u6574\u4e2a\u754c\u9762<\/li>\n\n\n\n<li>\u63d0\u9ad8\u6027\u80fd<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p>\u56fe\u793a\uff1a<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n@State variable  ---&gt;  Composable component\n       set()         |\u4f9d\u8d56|\n      notify UI ---&gt; re-render\n\n<\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\"><strong>\u4e09\u3001@State \u4f7f\u7528\u65b9\u6cd5<\/strong><\/h1>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>1. \u5b9a\u4e49\u72b6\u6001\u53d8\u91cf<\/strong><\/h2>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n@State\nvar username: String = &quot;&quot;\n@State\nvar isLogin: Boolean = false\n\n<\/pre><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li>\u53d8\u91cf\u53ef\u4ee5\u662f\u57fa\u672c\u7c7b\u578b\uff0c\u4e5f\u53ef\u4ee5\u662f\u96c6\u5408<\/li>\n\n\n\n<li>\u96c6\u5408\u7c7b\u578b\u63a8\u8350\u4f7f\u7528 <code>mutableListOf()<\/code> \/ <code>mutableMapOf()<\/code>\uff0c\u5426\u5219\u65e0\u6cd5\u89e6\u53d1 UI \u66f4\u65b0<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>2. \u5728 Composable \u4e2d\u4f7f\u7528<\/strong><\/h2>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nColumn() {\n    Text(&quot;Welcome, $username&quot;)\n    Button(&quot;Login&quot;) {\n        isLogin = true\n        username = &quot;HarmonyOSUser&quot;\n    }\n    if (isLogin) {\n        Text(&quot;Login successful&quot;)\n    }\n}\n\n<\/pre><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li>\u5f53 <code>isLogin<\/code> \u6216 <code>username<\/code> \u6539\u53d8\u65f6\uff0c\u5bf9\u5e94\u7684 <code>Text<\/code> \u4f1a\u81ea\u52a8\u5237\u65b0<\/li>\n\n\n\n<li>\u65e0\u9700\u624b\u52a8\u8c03\u7528 <code>invalidate()<\/code> \u6216 <code>notifyDataSetChanged()<\/code><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>3. \u96c6\u5408\u7c7b\u578b\u72b6\u6001<\/strong><\/h2>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n@State\nvar items = mutableListOf&amp;lt;String&gt;()\n\nColumn {\n    for (item in items) {\n        Text(item)\n    }\n\n    Button(&quot;Add Item&quot;) {\n        items.add(&quot;New Item&quot;) \/\/ \u4f1a\u81ea\u52a8\u5237\u65b0\u5217\u8868\n    }\n}\n\n<\/pre><\/div>\n\n\n<p>\u6ce8\u610f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u76f4\u63a5\u66ff\u6362\u6574\u4e2a\u96c6\u5408<\/strong> \u53ef\u4ee5\u89e6\u53d1\u66f4\u65b0 <code>items = items + listOf(\"Item2\")<\/code><\/li>\n\n\n\n<li><strong>\u96c6\u5408\u5185\u90e8\u5143\u7d20\u4fee\u6539<\/strong>\uff08\u5982 <code>items[0] = \"X\"<\/code>) \u4e0d\u4e00\u5b9a\u89e6\u53d1 UI\uff0c\u9700\u6574\u4f53\u66ff\u6362\u6216\u4f7f\u7528\u7279\u6b8a\u65b9\u6cd5<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\"><strong>\u56db\u3001@State \u4e0e\u751f\u547d\u5468\u671f<\/strong><\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>@State<\/code> \u53d8\u91cf\u4e0e Composable \u751f\u547d\u5468\u671f\u7ed1\u5b9a<\/li>\n\n\n\n<li>\u9875\u9762\u9000\u51fa\u65f6\uff0c@State \u4f1a\u81ea\u52a8\u9500\u6bc1<\/li>\n\n\n\n<li>\u9002\u5408\u7528\u4e8e <strong>\u4e34\u65f6 UI \u72b6\u6001<\/strong><\/li>\n\n\n\n<li>\u5bf9\u4e8e\u8de8\u9875\u9762\u6216\u8de8\u7ec4\u4ef6\u5171\u4eab\u72b6\u6001\uff0c\u5efa\u8bae\u4f7f\u7528 <strong>@AppStorage \/ ViewModel \/ StateStore<\/strong><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\"><strong>\u4e94\u3001@State \u7684\u9650\u5236\u4e0e\u6ce8\u610f\u4e8b\u9879<\/strong><\/h1>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u4e0d\u80fd\u5728\u975e Composable \u5916\u76f4\u63a5\u4f7f\u7528<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u63a8\u8350\u5728 AbilitySlice \/ Page \/ Composable \u5185\u4f7f\u7528<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u907f\u514d\u5927\u5bf9\u8c61\u9891\u7e41\u66f4\u65b0<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5927\u91cf\u5bf9\u8c61\u66f4\u65b0\u4f1a\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u96c6\u5408\u64cd\u4f5c\u9700\u6574\u4f53\u66ff\u6362<\/strong>\n<ul class=\"wp-block-list\">\n<li>List \/ Map \u5185\u90e8\u5355\u4e2a\u5143\u7d20\u4fee\u6539\u4e0d\u4f1a\u89e6\u53d1 UI<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u6df1\u5c42\u5bf9\u8c61\u72b6\u6001<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u591a\u5c42\u5d4c\u5957\u5bf9\u8c61\uff0c\u9700\u8981\u6bcf\u5c42\u90fd\u7528 @State \u6216\u4f7f\u7528 immutable \u6570\u636e\u7ed3\u6784<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\"><strong>\u516d\u3001@State \u6700\u4f73\u5b9e\u8df5<\/strong><\/h1>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>UI \u5c40\u90e8\u72b6\u6001<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u7528\u4e8e\u6309\u94ae\u72b6\u6001\u3001\u8f93\u5165\u6846\u5185\u5bb9\u3001\u5f39\u7a97\u663e\u793a<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u5168\u5c40\u72b6\u6001<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528 <code>@AppStorage<\/code> \u6216\u81ea\u5b9a\u4e49 <code>StateStore<\/code><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u96c6\u5408\u64cd\u4f5c<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5c3d\u91cf\u66ff\u6362\u6574\u4e2a\u96c6\u5408\uff0c\u6216\u4f7f\u7528 <code>mutableListOf().apply { ... }<\/code><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u6027\u80fd\u4f18\u5316<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u907f\u514d\u5728\u5faa\u73af\u6216\u5927\u5217\u8868\u4e2d\u9891\u7e41\u66f4\u65b0\u5355\u4e2a @State<\/li>\n\n\n\n<li>\u5bf9\u4e8e\u5927\u6570\u636e\u5217\u8868\uff0c\u4f7f\u7528 LazyColumn \u6216 List \u6e32\u67d3<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\"><strong>\u4e03\u3001\u5b8c\u6574\u793a\u4f8b<\/strong><\/h1>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n@Composable\nfun CounterPage() {\n    @State var counter = 0\n\n    Column(horizontalAlignment = Alignment.Center) {\n        Text(&quot;Counter: $counter&quot;)\n        Button(&quot;Increment&quot;) {\n            counter += 1\n        }\n        Button(&quot;Reset&quot;) {\n            counter = 0\n        }\n    }\n}\n\n<\/pre><\/div>\n\n\n<p>\u6548\u679c\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u70b9\u51fb <code>Increment<\/code> \u81ea\u52a8\u5237\u65b0 Text<\/li>\n\n\n\n<li>\u70b9\u51fb <code>Reset<\/code> \u91cd\u7f6e\u8ba1\u6570\u5668<\/li>\n\n\n\n<li>\u65e0\u9700\u624b\u52a8\u5237\u65b0\u754c\u9762<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\"><strong>\u516b\u3001\u603b\u7ed3<\/strong><\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>@State<\/code> \u662f HarmonyOS 5 ArkUI \u54cd\u5e94\u5f0f\u6570\u636e\u6838\u5fc3<\/li>\n\n\n\n<li>\u81ea\u52a8\u7ba1\u7406 UI \u4e0e\u72b6\u6001\u7ed1\u5b9a\uff0c\u63d0\u9ad8\u5f00\u53d1\u6548\u7387<\/li>\n\n\n\n<li>\u9002\u5408\u5c0f\u8303\u56f4\u9875\u9762\u72b6\u6001\u7ba1\u7406<\/li>\n\n\n\n<li>\u5bf9\u4e8e\u5168\u5c40\u6216\u590d\u6742\u72b6\u6001\uff0c\u9700\u8981\u7ed3\u5408 ViewModel \/ StateStore<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u4e0b\u9762\u7ed9\u4f60\u6574\u7406\u4e00\u4efd \u300aHarmonyOS 5 @State \u539f\u7406\u4e0e\u4f7f\u7528\u8be6\u89e3\u300b\uff0c\u5305\u542b&#8230; <a class=\"more-link\" href=\"https:\/\/www.52runoob.com\/index.php\/2025\/12\/09\/%e9%b8%bf%e8%92%99%e4%b8%adstate%e7%9a%84%e5%8e%9f%e7%90%86%e4%bd%bf%e7%94%a8%e8%af%a6%e8%a7%a3harmonyos-5\/\">Continue Reading &rarr;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-687","post","type-post","status-publish","format-standard","hentry","category-2"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts\/687","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/comments?post=687"}],"version-history":[{"count":1,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts\/687\/revisions"}],"predecessor-version":[{"id":688,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts\/687\/revisions\/688"}],"wp:attachment":[{"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/media?parent=687"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/categories?post=687"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/tags?post=687"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}