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  iOS CALayer动画 - kaelinda

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          <h1>iOS CALayer动画</h1>

        <div class="read-more clearfix">
          <span class="date">2018/9/3</span>

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

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


          <span class="comments">


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      <h2 id="toc_0">keyPath</h2>

<pre><code class="language-text">transform.scale = 比例轉換
transform.scale.x = 宽的比例轉換
transform.scale.y = 高的比例轉換
transform.rotation.z = 平面圖的旋轉
opacity = 透明度
margin=边框间隔?
zPosition = 平面图的位置
backgroundColor = 背景色
cornerRadius = layer的角度
borderWidth = 边框宽度
contents = 内容?
bounds = 大小?
contentsRect = 内容矩形
frame = 位置
hidden = 隐藏
mask = 标记
maskToBounds
position = 位置
shadowOffset = 阴影偏移?
shadowColor = 阴影颜色
shadowRadius = 阴影角度
</code></pre>

<h2 id="toc_1">CALayer</h2>

<h2 id="toc_2">CoreAnimation</h2>

<h2 id="toc_3">CAAnimation</h2>

<h3 id="toc_4">基本属性说明</h3>

<table>
<thead>
<tr>
<th>属性</th>
<th>说明</th>
</tr>
</thead>

<tbody>
<tr>
<td>duration</td>
<td>动画持续时间</td>
</tr>
<tr>
<td>repeatCount</td>
<td>重复次数，无限循环可以设置INFINITY(HUGE_VALF)或者MAXFLOAT</td>
</tr>
<tr>
<td>repeatDuration</td>
<td>重复时间</td>
</tr>
<tr>
<td>removeOnCompletion</td>
<td>默认为YES，代表动画执行完毕，从Layer上移除，图形会恢复到动画执行之前的状态。如果想要保持动画最终状态，那就设置为NO，并且fillMode = kCAFillModeForwards；</td>
</tr>
<tr>
<td>fillMode</td>
<td>当前视图在非active时段的状态比如 动画开始前 动画结束后</td>
</tr>
<tr>
<td>beginTime</td>
<td>可以用来延迟动画开始时间，让多个动画顺序执行</td>
</tr>
<tr>
<td>timingFuction</td>
<td>速度控制函数，控制动画运行的节奏</td>
</tr>
<tr>
<td>deleget</td>
<td>代理</td>
</tr>
</tbody>
</table>

<h3 id="toc_5">fillMode 说明</h3>

<ul>
<li><p><code>kCAFillModeRemoved</code> 这个是默认值，也就是说当动画开始前和动画结束后，动画对layer都没有影响，动画结束后，layer会恢复到之前的状态</p></li>
<li><p><code>kCAFillModeForwards</code> 当动画结束后，layer会一直保持着动画最后的状态</p></li>
<li><p><code>kCAFillModeBackwards</code> 在动画开始前，只需要将动画加入了一个layer，layer便立即进入动画的初始状态并等待动画开始。</p></li>
<li><p><code>kCAFillModeBoth</code> 这个其实就是上面两个的合成.动画加入后开始之前，layer便处于动画初始状态，动画结束后layer保持动画最后的状态</p></li>
</ul>

<h3 id="toc_6">动画的暂停 和 恢复</h3>

<pre><code class="language-text">#pragma - mark 暂停CALayer的动画
-(void)pauseLayer:(CALayer*)layer
{
    CFTimeInterval pausedTime = [layer convertTime:CACurrentMediaTime() fromLayer:nil];

    // 让CALayer的时间停止走动
      layer.speed = 0.0;
    // 让CALayer的时间停留在pausedTime这个时刻
    layer.timeOffset = pausedTime;
}

#pragma - mark 恢复CALayer的动画
-(void)resumeLayer:(CALayer*)layer
{
    CFTimeInterval pausedTime = layer.timeOffset;
    // 1. 让CALayer的时间继续行走
      layer.speed = 1.0;
    // 2. 取消上次记录的停留时刻
      layer.timeOffset = 0.0;
    // 3. 取消上次设置的时间
      layer.beginTime = 0.0;
    // 4. 计算暂停的时间(这里也可以用CACurrentMediaTime()-pausedTime)
    CFTimeInterval timeSincePause = [layer convertTime:CACurrentMediaTime() fromLayer:nil] - pausedTime;
    // 5. 设置相对于父坐标系的开始时间(往后退timeSincePause)
      layer.beginTime = timeSincePause;
}
</code></pre>

<h2 id="toc_7">CABasicAnimation</h2>

<h2 id="toc_8">CAKeyframeAnimation 关键帧动画</h2>

<h2 id="toc_9">CAAnimationGroup 动画组</h2>

<h2 id="toc_10">贝塞尔曲线</h2>

<h2 id="toc_11">弹性动画 CASpringAnimation</h2>

<pre><code class="language-text">CASpringAnimation *springAnimation = [CASpringAnimation animationWithKeyPath:@&quot;transform.scale&quot;];
springAnimation.damping = 7;// 阻尼系数(学过物理的都知道)
springAnimation.stiffness = 100;// 刚度系数（形变后产生弹力的大小的系数。刚度系数越大，弹力越大）
springAnimation.mass = 1;// 惯性系数 代表物体质量
springAnimation.initialVelocity = 2.0;// 初始速度 0 初始速度与运动方向一致 负数，初始速度与运动方向不一致
springAnimation.fromValue = @0;// 初始动画改变属性的值
springAnimation.toValue = @1;// 最终动画改变属性的值
springAnimation.duration = 2.0;// 动画时长「敲黑板，划重点！这个很重要」
[self.layer addAnimation:springAnimation forKey:@&quot;springScale&quot;];
</code></pre>

<h2 id="toc_12">特殊的Layer实现特殊动画</h2>

<h3 id="toc_13">CATransition</h3>

<h3 id="toc_14">CAReplicatorLayer</h3>

<h3 id="toc_15">CAEmitterLayer 粒子引擎</h3>


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