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<script src="https://snack.expo.io/embed.js" defer="defer"></script><title data-react-helmet="true">Learn the Basics · React Native</title><meta data-react-helmet="true" property="twitter:image" content="https://reactnative.dev/img/logo-og.png"><meta data-react-helmet="true" name="twitter:image:alt" content="Image for React Native"><meta data-react-helmet="true" name="docsearch:language" content="en"><meta data-react-helmet="true" name="docsearch:version" content="0.63"><meta data-react-helmet="true" name="docsearch:docusaurus_tag" content="docs-default-0.63"><meta data-react-helmet="true" property="og:image" content="https://reactnative.dev/img/logo-og.png"><meta data-react-helmet="true" name="twitter:card" content="summary"><meta data-react-helmet="true" name="twitter:image" content="https://reactnative.dev/img/logo-og.png"><meta data-react-helmet="true" property="og:title" content="Learn the Basics · React Native"><meta data-react-helmet="true" name="description" content="React Native is like React, but it uses native components instead of web components as building blocks. So to understand the basic structure of a React Native app, you need to understand some of the basic React concepts, like JSX, components, state, and props. If you already know React, you still need to learn some React-Native-specific stuff, like the native components. This tutorial is aimed at all audiences, whether you have React experience or not."><meta data-react-helmet="true" property="og:description" content="React Native is like React, but it uses native components instead of web components as building blocks. So to understand the basic structure of a React Native app, you need to understand some of the basic React concepts, like JSX, components, state, and props. If you already know React, you still need to learn some React-Native-specific stuff, like the native components. This tutorial is aimed at all audiences, whether you have React experience or not."><meta data-react-helmet="true" property="og:url" content="https://reactnative.dev/docs/tutorial"><link data-react-helmet="true" rel="shortcut icon" href="/img/favicon.ico"><link data-react-helmet="true" rel="preconnect" href="https://BH4D9OD16A-dsn.algolia.net" crossorigin="anonymous"><link data-react-helmet="true" rel="canonical" href="https://reactnative.dev/docs/tutorial"><link rel="stylesheet" href="/styles.bc3f26fc.css">
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<script src="https://snack.expo.io/embed.js" defer="defer"></script><title data-react-helmet="true">Learn the Basics · React Native</title><meta data-react-helmet="true" property="twitter:image" content="https://reactnative.dev/react-native/img/logo-og.png"><meta data-react-helmet="true" name="twitter:image:alt" content="Image for React Native"><meta data-react-helmet="true" name="docsearch:language" content="en"><meta data-react-helmet="true" name="docsearch:version" content="0.63"><meta data-react-helmet="true" name="docsearch:docusaurus_tag" content="docs-default-0.63"><meta data-react-helmet="true" property="og:image" content="https://reactnative.dev/img/logo-og.png"><meta data-react-helmet="true" name="twitter:card" content="summary"><meta data-react-helmet="true" name="twitter:image" content="https://reactnative.dev/img/logo-og.png"><meta data-react-helmet="true" property="og:title" content="Learn the Basics · React Native"><meta data-react-helmet="true" name="description" content="React Native is like React, but it uses native components instead of web components as building blocks. So to understand the basic structure of a React Native app, you need to understand some of the basic React concepts, like JSX, components, state, and props. If you already know React, you still need to learn some React-Native-specific stuff, like the native components. This tutorial is aimed at all audiences, whether you have React experience or not."><meta data-react-helmet="true" property="og:description" content="React Native is like React, but it uses native components instead of web components as building blocks. So to understand the basic structure of a React Native app, you need to understand some of the basic React concepts, like JSX, components, state, and props. If you already know React, you still need to learn some React-Native-specific stuff, like the native components. This tutorial is aimed at all audiences, whether you have React experience or not."><meta data-react-helmet="true" property="og:url" content="https://reactnative.dev/react-native/docs/tutorial"><link data-react-helmet="true" rel="shortcut icon" href="/react-native/img/favicon.ico"><link data-react-helmet="true" rel="preconnect" href="https://BH4D9OD16A-dsn.algolia.net" crossorigin="anonymous"><link data-react-helmet="true" rel="canonical" href="https://reactnative.dev/react-native/docs/tutorial"><link rel="stylesheet" href="/react-native/styles.bc3f26fc.css">
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</head>
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<body>
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<script>!function(){function t(t){document.documentElement.setAttribute("data-theme",t)}var e=function(){var t=null;try{t=localStorage.getItem("theme")}catch(t){}return t}();t(null!==e?e:"light")}()</script><div id="__docusaurus">
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<nav class="navbar navbar--fixed-top navbar--dark"><div class="navbar__inner"><div class="navbar__items"><div aria-label="Navigation bar toggle" class="navbar__toggle" role="button" tabindex="0"><svg xmlns="http://www.w3.org/2000/svg" width="30" height="30" viewBox="0 0 30 30" role="img" focusable="false"><title>Menu</title><path stroke="currentColor" stroke-linecap="round" stroke-miterlimit="10" stroke-width="2" d="M4 7h22M4 15h22M4 23h22"></path></svg></div><a class="navbar__brand" href="/"><img class="navbar__logo" src="/img/header_logo.svg" alt="React Native"><strong class="navbar__title">React Native</strong></a><div class="navbar__item dropdown dropdown--hoverable dropdown--left"><a class="navbar__item navbar__link" href="/docs/getting-started">0.63</a><ul class="dropdown__menu"><li><a class="dropdown__link" href="/docs/next/tutorial">Next</a></li><li><a aria-current="page" class="dropdown__link dropdown__link--active" href="/docs/tutorial">0.63</a></li><li><a class="dropdown__link" href="/docs/0.62/tutorial">0.62</a></li><li><a class="dropdown__link" href="/docs/0.61/tutorial">0.61</a></li><li><a class="dropdown__link" href="/docs/0.60/tutorial">0.60</a></li><li><a class="dropdown__link" href="/versions">All versions</a></li></ul></div></div><div class="navbar__items navbar__items--right"><a class="navbar__item navbar__link" href="/docs/getting-started">Docs</a><a class="navbar__item navbar__link" href="/docs/components-and-apis">Components</a><a class="navbar__item navbar__link" href="/docs/accessibilityinfo">API</a><a class="navbar__item navbar__link" href="/help">Community</a><a class="navbar__item navbar__link" href="/blog">Blog</a><a href="https://github.com/facebook/react-native" target="_blank" rel="noopener noreferrer" class="navbar__item navbar__link navbar-github-link" aria-label="GitHub repository"></a><div class="react-toggle react-toggle--disabled displayOnlyInLargeViewport_2aTZ"><div class="react-toggle-track"><div 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class="navbar-sidebar__backdrop"></div><div class="navbar-sidebar"><div class="navbar-sidebar__brand"><a class="navbar__brand" href="/"><img class="navbar__logo" src="/img/header_logo.svg" alt="React Native"><strong class="navbar__title">React Native</strong></a></div><div class="navbar-sidebar__items"><div class="menu"><ul class="menu__list"><li class="menu__list-item"><a class="menu__link" href="/docs/getting-started">Docs</a></li><li class="menu__list-item"><a class="menu__link" href="/docs/components-and-apis">Components</a></li><li class="menu__list-item"><a class="menu__link" href="/docs/accessibilityinfo">API</a></li><li class="menu__list-item"><a class="menu__link" href="/help">Community</a></li><li class="menu__list-item"><a class="menu__link" href="/blog">Blog</a></li><li class="menu__list-item"><a role="button" class="menu__link menu__link--sublist">Versions</a><ul class="menu__list"><li class="menu__list-item"><a class="menu__link" href="/docs/next/tutorial">Next</a></li><li class="menu__list-item"><a aria-current="page" class="menu__link menu__link--active" href="/docs/tutorial">0.63</a></li><li class="menu__list-item"><a class="menu__link" href="/docs/0.62/tutorial">0.62</a></li><li class="menu__list-item"><a class="menu__link" href="/docs/0.61/tutorial">0.61</a></li><li class="menu__list-item"><a class="menu__link" href="/docs/0.60/tutorial">0.60</a></li><li class="menu__list-item"><a class="menu__link" href="/versions">All versions</a></li></ul></li><li class="menu__list-item"><a href="https://github.com/facebook/react-native" target="_blank" rel="noopener noreferrer" class="menu__link navbar-github-link" aria-label="GitHub repository"></a></li></ul></div></div></div></nav><div class="main-wrapper"><div class="docPage_2gpo"><main class="docMainContainer_3EyW"><div class="container padding-vert--lg docItemWrapper_1Hme"><div class="row"><div class="col docItemCol_2AGf"><div class="docItemContainer_1tAC"><article><header><h1 class="docTitle_cWlf">Learn the Basics</h1></header><div class="markdown"><p>React NLine truncated
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<nav class="navbar navbar--fixed-top navbar--dark"><div class="navbar__inner"><div class="navbar__items"><div aria-label="Navigation bar toggle" class="navbar__toggle" role="button" tabindex="0"><svg xmlns="http://www.w3.org/2000/svg" width="30" height="30" viewBox="0 0 30 30" role="img" focusable="false"><title>Menu</title><path stroke="currentColor" stroke-linecap="round" stroke-miterlimit="10" stroke-width="2" d="M4 7h22M4 15h22M4 23h22"></path></svg></div><a class="navbar__brand" href="/react-native/"><img class="navbar__logo" src="/react-native/img/header_logo.svg" alt="React Native"><strong class="navbar__title">React Native</strong></a><div class="navbar__item dropdown dropdown--hoverable dropdown--left"><a class="navbar__item navbar__link" href="/react-native/docs/getting-started">0.63</a><ul class="dropdown__menu"><li><a class="dropdown__link" href="/react-native/docs/next/tutorial">Next</a></li><li><a aria-current="page" class="dropdown__link dropdown__link--active" href="/react-native/docs/tutorial">0.63</a></li><li><a class="dropdown__link" href="/react-native/docs/0.62/tutorial">0.62</a></li><li><a class="dropdown__link" href="/react-native/docs/0.61/tutorial">0.61</a></li><li><a class="dropdown__link" href="/react-native/docs/0.60/tutorial">0.60</a></li><li><a class="dropdown__link" href="/react-native/versions">All versions</a></li></ul></div></div><div class="navbar__items navbar__items--right"><a class="navbar__item navbar__link" href="/react-native/docs/getting-started">Docs</a><a class="navbar__item navbar__link" href="/react-native/docs/components-and-apis">Components</a><a class="navbar__item navbar__link" href="/react-native/docs/accessibilityinfo">API</a><a class="navbar__item navbar__link" href="/react-native/help">Community</a><a class="navbar__item navbar__link" href="/react-native/blog">Blog</a><a href="https://github.com/facebook/react-native" target="_blank" rel="noopener noreferrer" class="navbar__item navbar__link navbar-github-link" aria-label="GitHub repository"></a><div class="react-toggle react-toggle--disabled displayOnlyInLargeViewport_2aTZ"><div class="react-toggle-track"><div class="react-toggle-track-check"><span class="toggle_BsTx">🌜</span></div><div class="react-toggle-track-x"><span class="toggle_BsTx">🌞</span></div></div><div class="react-toggle-thumb"></div><input type="checkbox" disabled="" aria-label="Dark mode toggle" class="react-toggle-screenreader-only"></div><button type="button" class="DocSearch DocSearch-Button" aria-label="Search"><svg width="20" height="20" class="DocSearch-Search-Icon" viewBox="0 0 20 20"><path d="M14.386 14.386l4.0877 4.0877-4.0877-4.0877c-2.9418 2.9419-7.7115 2.9419-10.6533 0-2.9419-2.9418-2.9419-7.7115 0-10.6533 2.9418-2.9419 7.7115-2.9419 10.6533 0 2.9419 2.9418 2.9419 7.7115 0 10.6533z" stroke="currentColor" fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round"></path></svg><span class="DocSearch-Button-Placeholder">Search</span><span class="DocSearch-Button-Key">⌘</span><span class="DocSearch-Button-Key">K</span></button></div></div><div role="presentation" class="navbar-sidebar__backdrop"></div><div class="navbar-sidebar"><div class="navbar-sidebar__brand"><a class="navbar__brand" href="/react-native/"><img class="navbar__logo" src="/react-native/img/header_logo.svg" alt="React Native"><strong class="navbar__title">React Native</strong></a></div><div class="navbar-sidebar__items"><div class="menu"><ul class="menu__list"><li class="menu__list-item"><a class="menu__link" href="/react-native/docs/getting-started">Docs</a></li><li class="menu__list-item"><a class="menu__link" href="/react-native/docs/components-and-apis">Components</a></li><li class="menu__list-item"><a class="menu__link" href="/react-native/docs/accessibilityinfo">API</a></li><li class="menu__list-item"><a class="menu__link" href="/react-native/help">Community</a></li><li class="menu__list-item"><a class="menu__link" href="/react-native/blog">Blog</a></li><li class="menu__list-item"><a role="button" class="menu__link menu__link--sublist">Versions</a><ul class="menu__list"><li class="menu__list-item"><a class="menu__link" href="/react-native/docs/next/tutorial">Next</a></li><li class="menu__list-item"><a aria-current="page" class="menu__link menu__link--active" href="/react-native/docs/tutorial">0.63</a></li><li class="menu__list-item"><a class="menu__link" href="/react-native/docs/0.62/tutorial">0.62</a></li><li class="menu__list-item"><a class="menu__link" href="/react-native/docs/0.61/tutorial">0.61</a></li><li class="menu__list-item"><a class="menu__link" href="/react-native/docs/0.60/tutorial">0.60</a></li><li class="menu__list-item"><a class="menu__link" href="/react-native/versions">All versions</a></li></ul></li><li class="menu__list-item"><a href="https://github.com/facebook/react-native" target="_blank" rel="noopener noreferrer" class="menu__link navbar-github-link" aria-label="GitHub repository"></a></li></ul></div></divLine truncated
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</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token keyword" style="color:#c5a5c5">import</span><span class="token plain"> React</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"> useState </span><span class="token punctuation" style="color:#657b83">}</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">from</span><span class="token plain"> </span><span class="token string" style="color:#8dc891">'react'</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain" style="display:inline-block">
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</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain" style="display:inline-block">
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</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain" style="display:inline-block">
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@@ -40,16 +40,16 @@
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</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token keyword" style="color:#c5a5c5">import</span><span class="token plain"> React</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"> useState </span><span class="token punctuation" style="color:#657b83">}</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">from</span><span class="token plain"> </span><span class="token string" style="color:#8dc891">'react'</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token keyword" style="color:#c5a5c5">import</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"> View</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> Text</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> Button</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> StyleSheet </span><span class="token punctuation" style="color:#657b83">}</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">from</span><span class="token plain"> </span><span class="token string" style="color:#8dc891">'react-native'</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain" style="display:inline-block">
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</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token keyword" style="color:#c5a5c5">const</span><span class="token plain"> </span><span class="token function-variable function" style="color:#79b6f2">App</span><span class="token plain"> </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"> </span><span class="token operator" style="color:#fc929e">=></span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">const</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">[</span><span class="token plain">count</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> setCount</span><span class="token punctuation" style="color:#657b83">]</span><span class="token plain"> </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">useState</span><span class="token punctuation" style="color:#657b83">(</span><span class="token number" style="color:#5a9bcf">0</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain" style="display:inline-block">
|
||||
</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">return</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#657b83"><</span><span class="token tag class-name" style="color:#fac863">View</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">style</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript" style="color:#fc929e">styles</span><span class="token tag script language-javascript punctuation" style="color:#657b83">.</span><span class="token tag script language-javascript" style="color:#fc929e">container</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag punctuation" style="color:#657b83">></span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#657b83"><</span><span class="token tag class-name" style="color:#fac863">Text</span><span class="token tag punctuation" style="color:#657b83">></span><span class="token plain">You clicked </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain">count</span><span class="token punctuation" style="color:#657b83">}</span><span class="token plain"> times</span><span class="token tag punctuation" style="color:#657b83"></</span><span class="token tag class-name" style="color:#fac863">Text</span><span class="token tag punctuation" style="color:#657b83">></span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token tag punctuation" style="color:#657b83"><</span><span class="token tag class-name" style="color:#fac863">Button</span><span class="token tag" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">onPress</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript punctuation" style="color:#657b83">(</span><span class="token tag script language-javascript punctuation" style="color:#657b83">)</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript operator" style="color:#fc929e">=></span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript function" style="color:#79b6f2">setCount</span><span class="token tag script language-javascript punctuation" style="color:#657b83">(</span><span class="token tag script language-javascript" style="color:#fc929e">count </span><span class="token tag script language-javascript operator" style="color:#fc929e">+</span><span class="token tag script language-javascript" style="color:#fc929e"> </span><span class="token tag script language-javascript number" style="color:#5a9bcf">1</span><span class="token tag script language-javascript punctuation" style="color:#657b83">)</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">titles</span><span class="token tag attr-value punctuation" style="color:#657b83">=</span><span class="token tag attr-value punctuation" style="color:#657b83">"</span><span class="token tag attr-value" style="color:#8dc891">Click me!</span><span class="token tag attr-value punctuation" style="color:#657b83">"</span><span class="token tag" style="color:#fc929e"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token tag" style="color:#fc929e"> </span><span class="token tag punctuation" style="color:#657b83">/></span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token tag Line truncated
|
||||
</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token comment" style="color:#93a1a1">// React Native Styles</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token keyword" style="color:#c5a5c5">const</span><span class="token plain"> styles </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> StyleSheet</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">create</span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> container</span><span class="token punctuation" style="color:#657b83">:</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> flex</span><span class="token punctuation" style="color:#657b83">:</span><span class="token plain"> </span><span class="token number" style="color:#5a9bcf">1</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> justifyContent</span><span class="token punctuation" style="color:#657b83">:</span><span class="token plain"> </span><span class="token string" style="color:#8dc891">'center'</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> alignItems</span><span class="token punctuation" style="color:#657b83">:</span><span class="token plain"> </span><span class="token string" style="color:#8dc891">'center'</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">}</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token punctuation" style="color:#657b83">}</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span></div></div></div></div></div></div><p>As shown in the image, there is no difference in handling the <code>state</code> between <a href="https://reactjs.org/docs/state-and-lifecycle.html" target="_blank" rel="noopener noreferrer">React</a> and <code>React Native</code>. You can use the state of your components both in classes and in functional components using <a href="https://reactjs.org/docs/hooks-intro.html" target="_blank" rel="noopener noreferrer">hooks</a>!</p><p>In the following example we will show the same above counter example using classes.</p><div class="snack-player" data-snack-name="Hello Classes" data-snack-description="Example usage" data-snack-code="import%20React%2C%20%7B%20Component%20%7D%20from%20'react'%0Aimport%20%7B%0A%20%20StyleSheet%2C%0A%20%20TouchableOpacity%2C%0A%20%20Text%2C%0A%20%20View%2C%0A%7D%20from%20'react-native'%0A%0Aclass%20App%20extends%20Component%20%7B%0A%20%20state%20%3D%20%7B%0A%20%20%20%20count%3A%200%0A%20%20%7D%0A%0A%20%20onPress%20%3D%20()%20%3D%3E%20%7B%0A%20%20%20%20this.setState(%7B%0A%20%20%20%20%20%20count%3A%20this.state.count%20%2B%201%0A%20%20%20%20%7D)%0A%20%20%7D%0A%0A%20render()%20%7B%0A%20%20%20%20return%20(%0A%20%20%20%20%20%20%3CView%20style%3D%7Bstyles.container%7D%3E%0A%20%20%20%20%20%20%20%20%3CTouchableOpacity%0A%20%20%20%20%20%20%20%20%20style%3D%7Bstyles.button%7D%0A%20%20%20%20%20%20%20%20%20onPress%3D%7Bthis.onPress%7D%0A%20%20%20%20%20%20%20%20%3E%0A%20%20%20%20%20%20%20%20%20%3CText%3EClick%20me%3C%2FText%3E%0A%20%20%20%20%20%20%20%20%3C%2FTouchableOpacity%3E%0A%20%20%20%20%20%20%20%20%3CView%3E%0A%20%20%20%20%20%20%20%20%20%20%3CText%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20You%20clicked%20%7B%20this.state.count%20%7D%20times%0A%20%20%20%20%20%20%20%20%20%20%3C%2FText%3E%0A%20%20%20%20%20%20%20%20%3C%2FView%3E%0A%20%20%20%20%20%20%3C%2FView%3E%0A%20%20%20%20)%0A%20%20%7D%0A%7D%0A%0Aconst%20styles%20%3D%20StyleSheet.create(%7B%0A%20%20container%3A%20%7B%0A%20%20%20%20flex%3A%201%2C%0A%20%20%20%20justifyContent%3A%20'center'%2C%0A%20%20%20%20alignItems%3A%20'center'%2C%0A%20%20%7D%2C%0A%20%20button%3A%20%7B%0A%20%20%20%20alignItems%3A%20'center'%2C%0A%20%20%20%20backgroundColor%3A%20'%23DDDDDD'%2C%0A%20%20%20%20padding%3A%2010%2C%0A%20%20%20%20marginLine truncated
|
||||
<script src="/styles.473a8a2f.js"></script>
|
||||
<script src="/runtime~main.c27877bd.js"></script>
|
||||
<script src="/main.a296a144.js"></script>
|
||||
<script src="/1.c2efdf9c.js"></script>
|
||||
<script src="/2.df07bbe5.js"></script>
|
||||
<script src="/938.90ac1b2e.js"></script>
|
||||
<script src="/943.9ae23c1b.js"></script>
|
||||
<script src="/ee5b3385.a8b9fcd6.js"></script>
|
||||
<script src="/17896441.f6a73c80.js"></script>
|
||||
<script src="/78a42ea2.c6588c82.js"></script>
|
||||
</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token comment" style="color:#93a1a1">// React Native Styles</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token keyword" style="color:#c5a5c5">const</span><span class="token plain"> styles </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> StyleSheet</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">create</span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> container</span><span class="token punctuation" style="color:#657b83">:</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> flex</span><span class="token punctuation" style="color:#657b83">:</span><span class="token plain"> </span><span class="token number" style="color:#5a9bcf">1</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> justifyContent</span><span class="token punctuation" style="color:#657b83">:</span><span class="token plain"> </span><span class="token string" style="color:#8dc891">'center'</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> alignItems</span><span class="token punctuation" style="color:#657b83">:</span><span class="token plain"> </span><span class="token string" style="color:#8dc891">'center'</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">}</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token punctuation" style="color:#657b83">}</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span></div></div></div></div></div></div><p>As shown in the image, there is no difference in handling the <code>state</code> between <a href="https://reactjs.org/docs/state-and-lifecycle.html" target="_blank" rel="noopener noreferrer">React</a> and <code>React Native</code>. You can use the state of your components both in classes and in functional components using <a href="https://reactjs.org/docs/hooks-intro.html" target="_blank" rel="noopener noreferrer">hooks</a>!</p><p>In the following example we will show the same above counter example using classes.</p><div class="snack-player" data-snack-name="Hello Classes" data-snack-description="Example usage" data-snack-code="import%20React%2C%20%7B%20Component%20%7D%20from%20'react'%0Aimport%20%7B%0A%20%20StyleSheet%2C%0A%20%20TouchableOpacity%2C%0A%20%20Text%2C%0A%20%20View%2C%0A%7D%20from%20'react-native'%0A%0Aclass%20App%20extends%20Component%20%7B%0A%20%20state%20%3D%20%7B%0A%20%20%20%20count%3A%200%0A%20%20%7D%0A%0A%20%20onPress%20%3D%20()%20%3D%3E%20%7B%0A%20%20%20%20this.setState(%7B%0A%20%20%20%20%20%20count%3A%20this.state.count%20%2B%201%0A%20%20%20%20%7D)%0A%20%20%7D%0A%0A%20render()%20%7B%0A%20%20%20%20return%20(%0A%20%20%20%20%20%20%3CView%20style%3D%7Bstyles.container%7D%3E%0A%20%20%20%20%20%20%20%20%3CTouchableOpacity%0A%20%20%20%20%20%20%20%20%20style%3D%7Bstyles.button%7D%0A%20%20%20%20%20%20%20%20%20onPress%3D%7Bthis.onPress%7D%0A%20%20%20%20%20%20%20%20%3E%0A%20%20%20%20%20%20%20%20%20%3CText%3EClick%20me%3C%2FText%3E%0A%20%20%20%20%20%20%20%20%3C%2FTouchableOpacity%3E%0A%20%20%20%20%20%20%20%20%3CView%3E%0A%20%20%20%20%20%20%20%20%20%20%3CText%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20You%20clicked%20%7B%20this.state.count%20%7D%20times%0A%20%20%20%20%20%20%20%20%20%20%3C%2FText%3E%0A%20%20%20%20%20%20%20%20%3C%2FView%3E%0A%20%20%20%20%20%20%3C%2FView%3E%0A%20%20%20%20)%0A%20%20%7D%0A%7D%0A%0Aconst%20styles%20%3D%20StyleSheet.create(%7B%0A%20%20container%3A%20%7B%0A%20%20%20%20flex%3A%201%2C%0A%20%20%20%20justifyContent%3A%20'center'%2C%0A%20%20%20%20alignItems%3A%20'center'%2C%0A%20%20%7D%2C%0A%20%20button%3A%20%7B%0A%20%20%20%20alignItems%3A%20'center'%2C%0A%20%20%20%20backgroundColor%3A%20'%23DDDDDD'%2C%0A%20%20%20%20padding%3A%2010%2C%0A%20%20%20%20marginLine truncated
|
||||
<script src="/react-native/styles.ecce6748.js"></script>
|
||||
<script src="/react-native/runtime~main.03447a47.js"></script>
|
||||
<script src="/react-native/main.9cf581fa.js"></script>
|
||||
<script src="/react-native/1.c2efdf9c.js"></script>
|
||||
<script src="/react-native/2.df07bbe5.js"></script>
|
||||
<script src="/react-native/938.7660bbfd.js"></script>
|
||||
<script src="/react-native/943.9ae23c1b.js"></script>
|
||||
<script src="/react-native/ee5b3385.b7e352cf.js"></script>
|
||||
<script src="/react-native/17896441.908b971b.js"></script>
|
||||
<script src="/react-native/78a42ea2.e7d13e60.js"></script>
|
||||
</body>
|
||||
</html>
|
||||
Reference in new issue
Block a user