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          <h1>iOS 动画全解 (1)</h1>

        <div class="read-more clearfix">
          <span class="date">2019/3/11</span>

          <span>posted in&nbsp;</span>

              <span class="posted-in"><a href='ios.html'>iOS</a></span>


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      <h2 id="toc_0">iOS动画&quot;概述&quot;（瞎说一通）</h2>

<p>Apple 为开发者提供的视图动画框架有如下几种：</p>

<ul>
<li><code>UIKit</code>：高级别框架,允许程序员创建视图,窗口,按钮,和其他 UI 相关的控件。它也将低层的 API 组合到一个 易于使用的高级别 API 中。</li>
<li><code>Quartz 2D</code>：运行内部的用于 iOS 画图的主引擎;UIKit 使用了 Quarz。 重点在画图。</li>
<li><p><code>Core Graphics</code>(核心图层)：加载图片，绘制图片等的框架重点在图形图片的渲染。</p></li>
<li><p><code>Core Animation</code>：iOS上的最基础的，应用最广泛的动画框架。（加载到CALayer上的动画）<br/>
<code>Core Animation</code> 其实是一个令人误解的命名。你可能认为它只是用来做动画的，但实际上它是从一个叫做<code>Layer Kit</code>这么一个不怎么和动画有关的名字演变而来，所以做动画这只是<code>Core Animation</code>特性的冰山一角。 <code>Core Animation</code>是一个复合引擎，它的职责就是尽可能快地组合屏幕上不同的可视内容，这个内容是被分解成独立的图层，存储在一个叫做图层树的体系之中。于是这个树形成了<code>UIKit</code>以及在iOS应用程序当中你所能在屏幕上 看见的一切的基础。</p></li>
</ul>

<h2 id="toc_1">CALayer 和 UIView</h2>

<h3 id="toc_2">CALayer</h3>

<p><code>CALayer</code> 类在概念上和 <code>UIView</code> 类似，同样也是一些被层级关系树管理的矩形块，同样也可以包含一些内 容(像图片，文本或者背景色)，管理子图层的位置。它们有一些方法和属性用来做动画和变换。和 最 大的不同是<code>CALayer</code>不处理用户的交互。</p>

<h3 id="toc_3">平行的层级关系</h3>

<p>每一个<code>UIView</code>都有一个<code>CALayer</code>实例的图层属性，也就是所谓的<code>backing layer</code>，视图的职责就是创建并管理这个图层，以确保当子视图在层级关系中添加或者被移除的时候，他们关联的图层也同样对应在层级关系树当中有相同的操作。(可以理解为 UIViewController  和 VC.view的关系，只不过VC是UIView的管理调度者,UIView 是 CALayer的管理调度者)</p>

<h3 id="toc_4">CALayer的能力</h3>

<ul>
<li>阴影，圆角，带颜色的边框 • 3D变换</li>
<li>非矩形范围</li>
<li>透明遮罩</li>
<li><p>多级非线性动画</p></li>
<li><p>contents属性</p></li>
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