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class="sidebar-heading"><span>开发</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/guide/develop/setup-develop-environment.html" class="sidebar-link">设置开发环境</a></li><li><a href="/zh/guide/develop/create-a-new-app.html" class="sidebar-link">创建一个新的app</a></li><li><a href="/zh/guide/develop/weex_cli.html" class="sidebar-link">Weex CLI</a></li><li><a href="/zh/guide/develop/integrate-to-android-app.html" class="sidebar-link">集成到Android应用</a></li><li><a href="/zh/guide/develop/integrate-to-iOS-app.html" class="sidebar-link">集成到iOS应用</a></li><li><a href="/zh/guide/develop/weex_error_code.html" class="sidebar-link">WEEX常见错误码</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>调试</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/guide/debug/integrate-devtool-to-android.html" class="sidebar-link">集成Devtool到Android</a></li><li><a href="/zh/guide/debug/integrate-devtool-to-ios.html" class="sidebar-link">集成Devtool到iOS</a></li><li><a href="/zh/guide/debug/debug.html" class="sidebar-link">调试</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>扩展</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/guide/extend/extend-android.html" class="sidebar-link">扩展Android能力</a></li><li><a href="/zh/guide/extend/extend-ios.html" class="sidebar-link">扩展iOS能力</a></li><li><a href="/zh/guide/extend/extend-ios-with-swift.html" class="sidebar-link">使用Swift扩展iOS能力</a></li><li><a href="/zh/guide/extend/extend-web.html" class="sidebar-link">扩展Web组件</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading open"><span>高阶特性</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/guide/advanced/asset-path.html" class="sidebar-link">资源路径</a></li><li><a href="/zh/guide/advanced/downgrade.html" class="sidebar-link">降级方案</a></li><li><a href="/zh/guide/advanced/use-vuex-and-vue-router.html" class="sidebar-link">使用Vuex和vue-router</a></li><li><a href="/zh/guide/advanced/multi-size-screen.html" class="active sidebar-link">适应不同尺寸屏幕</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/zh/guide/advanced/multi-size-screen.html#简介" class="sidebar-link">简介</a></li><li class="sidebar-sub-header"><a href="/zh/guide/advanced/multi-size-screen.html#weex-如何将前端样式值转换为系统坐标值" class="sidebar-link">Weex 如何将前端样式值转换为系统坐标值</a></li><li class="sidebar-sub-header"><a href="/zh/guide/advanced/multi-size-screen.html#为什么-weex-页面不支持横竖屏切换" class="sidebar-link">为什么 Weex 页面不支持横竖屏切换</a></li><li class="sidebar-sub-header"><a href="/zh/guide/advanced/multi-size-screen.html#屏幕参数接口" class="sidebar-link">屏幕参数接口</a></li><li class="sidebar-sub-header"><a href="/zh/guide/advanced/multi-size-screen.html#使用场景" class="sidebar-link">使用场景</a></li></ul></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>贡献</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/guide/contribute/how-to-contribute.html" class="sidebar-link">加入 Weex 社区</a></li><li><a href="/zh/guide/contribute/thanks.html" class="sidebar-link">鸣谢</a></li></ul></div></li></ul></div><div class="page"><div class="content"><h2 id="简介"><a href="#简介" class="header-anchor">#</a> 简介</h2><p>本文将介绍 Weex 适配不同尺寸屏幕的方法以及横竖屏动态切换时如何自适应。</p><h2 id="weex-如何将前端样式值转换为系统坐标值"><a href="#weex-如何将前端样式值转换为系统坐标值" class="header-anchor">#</a> Weex 如何将前端样式值转换为系统坐标值</h2><p>以 iOS 为例，在应用启动时，Weex 获取当前屏幕宽度作为全局默认值。在 iOS 系统上该宽度为实际像素/屏幕比例后的 UIKit 宽度。比如 iPhone6 为 375。</p><div class="language-C extra-class"><pre class="language-c"><code>@implementation WXCoreBridge |
| |
| <span class="token operator">+</span> <span class="token punctuation">(</span><span class="token keyword">void</span><span class="token punctuation">)</span>install |
| <span class="token punctuation">{</span> |
| <span class="token keyword">static</span> dispatch_once_t onceToken<span class="token punctuation">;</span> |
| <span class="token function">dispatch_once</span><span class="token punctuation">(</span><span class="token operator">&</span>onceToken<span class="token punctuation">,</span> <span class="token operator">^</span><span class="token punctuation">{</span> |
| WeexCore<span class="token operator">::</span>WXCoreEnvironment<span class="token operator">*</span> env <span class="token operator">=</span> WeexCore<span class="token operator">::</span>WXCoreEnvironment<span class="token operator">::</span><span class="token function">getInstance</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| env<span class="token operator">-></span><span class="token function">SetPlatform</span><span class="token punctuation">(</span>OS_iOS<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| env<span class="token operator">-></span><span class="token function">AddOption</span><span class="token punctuation">(</span><span class="token string">"scale"</span><span class="token punctuation">,</span> <span class="token string">"1"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| CGSize screenSize <span class="token operator">=</span> <span class="token punctuation">[</span>UIScreen mainScreen<span class="token punctuation">]</span><span class="token punctuation">.</span>bounds<span class="token punctuation">.</span>size<span class="token punctuation">;</span> |
| env<span class="token operator">-></span><span class="token function">SetDeviceWidth</span><span class="token punctuation">(</span>std<span class="token operator">::</span><span class="token function">to_string</span><span class="token punctuation">(</span>screenSize<span class="token punctuation">.</span>width<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| env<span class="token operator">-></span><span class="token function">SetDeviceHeight</span><span class="token punctuation">(</span>std<span class="token operator">::</span><span class="token function">to_string</span><span class="token punctuation">(</span>screenSize<span class="token punctuation">.</span>height<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><span class="token punctuation">.</span><span class="token punctuation">.</span> |
| <span class="token punctuation">}</span> |
| </code></pre></div><p>创建的每个 WXSDKInstance，其默认的 viewPortWidth 为 750px。</p><div class="language-C extra-class"><pre class="language-c"><code><span class="token comment">// The default screen width which helps us to calculate the real size or scale in different devices.</span> |
| <span class="token keyword">static</span> <span class="token keyword">const</span> CGFloat WXDefaultScreenWidth <span class="token operator">=</span> <span class="token number">750.0</span><span class="token punctuation">;</span> |
| </code></pre></div><p>当指定 CSS 样式值为 "375px" 时，Weex 在接收到该样式后，自动根据当前屏幕宽度和当前 Instance 的 viewPortWidth 计算出在 iOS 系统上，对应的 UIKit 坐标值为：</p><div class="language-C extra-class"><pre class="language-c"><code><span class="token function">dimension</span><span class="token punctuation">(</span>UIKit<span class="token punctuation">)</span> <span class="token operator">=</span> <span class="token function">dimensionPx</span><span class="token punctuation">(</span>CSS<span class="token punctuation">)</span> <span class="token operator">/</span> <span class="token function">viewPortWidth</span><span class="token punctuation">(</span>instance<span class="token punctuation">)</span> <span class="token operator">*</span> globalScreenWidth |
| </code></pre></div><p>代入后： |
| dimension(UIKit) = 375 / 750 * 375 = 187.5</p><p>之后 Weex 排版引擎使用 187.5 来排版，并最终将排版后的结果设置给 iOS UIView。之后没有坐标转换过程了。</p><h2 id="为什么-weex-页面不支持横竖屏切换"><a href="#为什么-weex-页面不支持横竖屏切换" class="header-anchor">#</a> 为什么 Weex 页面不支持横竖屏切换</h2><p>如上文所述，Weex 最终将原始样式值转换为平台 UI 系统的坐标值，之后原始样式值被丢弃。这个有一定历史原因，且当页面非常大或复杂时，丢弃后可以节省很多内存，因此原始样式值被丢弃。</p><p>同时，目前 Weex 不支持百分比布局，大量竖屏页面使用 750px 的 viewPortWidth 值为基准进行开发，页面里的坐标值都是根据 750px 为一个屏幕宽度换算后的值。</p><p>当屏幕发生旋转后，比如 iPhone6 手机，旋转后的 “宽 * 高” 为 “667 * 375”。此时我们需要原始的样式值来重新计算出设置给排版引擎的坐标值，如前文所说，排版引擎接收的是 iOS UIKit 的坐标值。这个时候对于仍然为 "375px" 的样式，其计算出的 UIKit 坐标值为：</p><p>dimension(UIKit) = 375 / 750 * 667 = 333.5</p><p>仍然为宽屏下的屏幕宽度一半。</p><p>但是因为原始样式值被丢弃，我们不能支持横竖屏切换。</p><h2 id="屏幕参数接口"><a href="#屏幕参数接口" class="header-anchor">#</a> 屏幕参数接口</h2><p>我们通过添加一系列接口让 Weex 使用者可以控制排版参数。</p><h3 id="一、设置页面使用的-viewportwidth"><a href="#一、设置页面使用的-viewportwidth" class="header-anchor">#</a> 一、设置页面使用的 viewPortWidth</h3><h4 id="_1-使用-meta-module"><a href="#_1-使用-meta-module" class="header-anchor">#</a> 1. 使用 Meta Module</h4><div class="language-Javascript extra-class"><pre class="language-javascript"><code><span class="token keyword">const</span> meta <span class="token operator">=</span> weex<span class="token punctuation">.</span><span class="token function">requireModule</span><span class="token punctuation">(</span><span class="token string">'meta'</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| meta<span class="token punctuation">.</span><span class="token function">setViewport</span><span class="token punctuation">(</span><span class="token punctuation">{</span> |
| width<span class="token punctuation">:</span> <span class="token number">800</span> |
| <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </code></pre></div><h4 id="_2-使用-wxsdkinstance-的接口"><a href="#_2-使用-wxsdkinstance-的接口" class="header-anchor">#</a> 2. 使用 WXSDKInstance 的接口</h4><ul><li>iOS:</li></ul><div class="language-Objective-C extra-class"><pre class="language-text"><code>WXSDKInstance* instance = [[WXSDKInstance alloc] init]; |
| [instance setViewportWidth:800.f]; |
| </code></pre></div><ul><li>Android:</li></ul><div class="language-Java extra-class"><pre class="language-java"><code><span class="token class-name">WXSDKInstance</span> instance <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">WXSDKInstance</span><span class="token punctuation">(</span>mContext<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| instance<span class="token punctuation">.</span><span class="token function">setInstanceViewPortWidth</span><span class="token punctuation">(</span><span class="token number">800</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </code></pre></div><h3 id="二、设置页面使用的-devicewidth"><a href="#二、设置页面使用的-devicewidth" class="header-anchor">#</a> 二、设置页面使用的 deviceWidth</h3><div class="danger custom-block"><p class="custom-block-title">WARNING</p><p>Android暂不支持</p></div><span class="badge warning top">v0.25+</span><h4 id="_1-使用-meta-module-2"><a href="#_1-使用-meta-module-2" class="header-anchor">#</a> 1. 使用 Meta Module</h4><div class="language-Javascript extra-class"><pre class="language-javascript"><code><span class="token keyword">const</span> meta <span class="token operator">=</span> weex<span class="token punctuation">.</span><span class="token function">requireModule</span><span class="token punctuation">(</span><span class="token string">'meta'</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| meta<span class="token punctuation">.</span><span class="token function">setViewport</span><span class="token punctuation">(</span><span class="token punctuation">{</span> |
| deviceWidth<span class="token punctuation">:</span> <span class="token number">375</span><span class="token punctuation">,</span> |
| deviceHeight<span class="token punctuation">:</span> <span class="token number">800</span> |
| <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </code></pre></div><h4 id="_2-使用-wxsdkinstance-的接口-2"><a href="#_2-使用-wxsdkinstance-的接口-2" class="header-anchor">#</a> 2. 使用 WXSDKInstance 的接口</h4><div class="language-Objective-C extra-class"><pre class="language-text"><code>WXSDKInstance* instance = [[WXSDKInstance alloc] init]; |
| [instance setPageRequiredWidth:375.f height:800.f]; |
| </code></pre></div><h4 id="_3-设置全局的-devicewidth"><a href="#_3-设置全局的-devicewidth" class="header-anchor">#</a> 3. 设置全局的 deviceWidth</h4><div class="language-Objective-C extra-class"><pre class="language-text"><code>[WXSDKEngine setGlobalDeviceSize:CGSizeMake([UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)]; |
| </code></pre></div><h3 id="三、设置页面保留原始-css-样式值"><a href="#三、设置页面保留原始-css-样式值" class="header-anchor">#</a> 三、设置页面保留原始 CSS 样式值</h3><span class="badge warning top">v0.25+</span><h4 id="_1-使用-meta-module-3"><a href="#_1-使用-meta-module-3" class="header-anchor">#</a> 1. 使用 Meta Module</h4><div class="language-Javascript extra-class"><pre class="language-javascript"><code><span class="token keyword">const</span> meta <span class="token operator">=</span> weex<span class="token punctuation">.</span><span class="token function">requireModule</span><span class="token punctuation">(</span><span class="token string">'meta'</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| meta<span class="token punctuation">.</span><span class="token function">setViewport</span><span class="token punctuation">(</span><span class="token punctuation">{</span> |
| reserveCssStyles<span class="token punctuation">:</span> <span class="token boolean">true</span> |
| <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </code></pre></div><h4 id="_2-使用-wxsdkinstance-的接口-3"><a href="#_2-使用-wxsdkinstance-的接口-3" class="header-anchor">#</a> 2. 使用 WXSDKInstance 的接口</h4><ul><li>iOS:</li></ul><div class="language-Objective-C extra-class"><pre class="language-text"><code>WXSDKInstance* instance = [[WXSDKInstance alloc] init]; |
| [instance setPageKeepRawCssStyles]; |
| </code></pre></div><ul><li>Android:</li></ul><div class="language-Java extra-class"><pre class="language-java"><code><span class="token class-name">WXSDKInstance</span> instance <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">WXSDKInstance</span><span class="token punctuation">(</span>mContext<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| instance<span class="token punctuation">.</span><span class="token function">setPageKeepRawCssStyles</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </code></pre></div><h3 id="四、强制页面重新排版"><a href="#四、强制页面重新排版" class="header-anchor">#</a> 四、强制页面重新排版</h3><span class="badge warning top">v0.25+</span><ul><li>iOS:</li></ul><div class="language-Objective-C extra-class"><pre class="language-text"><code>[instance reloadLayout]; |
| </code></pre></div><ul><li>Android:</li></ul><div class="language-Java extra-class"><pre class="language-java"><code>instance<span class="token punctuation">.</span><span class="token function">reloadPageLayout</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </code></pre></div><h2 id="使用场景"><a href="#使用场景" class="header-anchor">#</a> 使用场景</h2><h3 id="一、不可旋转屏幕的应用"><a href="#一、不可旋转屏幕的应用" class="header-anchor">#</a> 一、不可旋转屏幕的应用</h3><p>如果应用不支持屏幕旋转，你可以不用关心以上问题。当 Weex 启动时，会自动获取当前屏幕宽度作为全局宽度，所有之后创建的 Weex 页面都会使用该宽度。</p><h3 id="二、某个特殊页面支持横竖屏切换"><a href="#二、某个特殊页面支持横竖屏切换" class="header-anchor">#</a> 二、某个特殊页面支持横竖屏切换</h3><span class="badge warning top">v0.25+</span><p>1、设置页面保留原始 CSS 样式值 |
| 2、当屏幕旋转完成后，调用以下接口设置新的屏幕尺寸，并重新排版</p><ul><li>iOS:</li></ul><div class="language-Objective-C extra-class"><pre class="language-text"><code>CGFloat w = [UIScreen mainScreen].bounds.size.width; |
| CGFloat h = [UIScreen mainScreen].bounds.size.height; |
| [_instance setPageRequiredWidth:w height:h]; |
| [_instance reloadLayout]; |
| </code></pre></div><ul><li>Android:</li></ul><div class="language-Java extra-class"><pre class="language-java"><code>instance<span class="token punctuation">.</span><span class="token function">resetDeviceDisplayOfPage</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| instance<span class="token punctuation">.</span><span class="token function">reloadPageLayout</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </code></pre></div><p>你可以使用最新 Playground 扫码<a href="http://editor.weex.io/p/wqyfavor/scroller/commit/37810078ef963388b699b5ad7d5e9881" target="_blank" rel="noopener noreferrer">示例<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a> |
| 要在控制面板里允许屏幕自动旋转。</p><p><a href="https://img.alicdn.com/tfs/TB1gWiTcvWG3KVjSZPcXXbkbXXa-240-427.gif" target="_blank" rel="noopener noreferrer">image<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></p><h3 id="三、注意"><a href="#三、注意" class="header-anchor">#</a> 三、注意</h3><p>对于不希望受屏幕宽度和 viewPortWidth 影响的尺寸，请使用 'wx' 单位。</p></div><div class="page-nav"><p class="inner"><span class="prev"> |
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| Incubator. Incubation is required of all newly accepted projects until a further review indicates that the |
| infrastructure, communications, and decision making process have stabilized in a manner consistent with |
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