使用 CGLayers 创建自定义动画？
基本上，我想制作一个缩小的圆圈的动画。我已经通过在 CGLayer 上绘制逐渐变小的圆圈，然后使用
if(index < 30){
[self PerformSelector:@selector(showNextLayer) withObject:nil afterDelay:(NSTimeInterval)0.02]; 索引++；
在
我的 showNextLayer 方法中。这适用于我的简单目标，但总的来说，这是绘制自定义动画的或多或少合理的方式吗？
Apple 有很多关于动画的文档 - 足以让我困惑 - 但据我 - 最终 - 理解：
- UIView 提供的动画服务非常适合对一些基本视图属性、视图转换等进行动画处理，
- 这些属性由以下类提供：继承自 CAAnimation，适用于对颜色变化、3d 变换等属性进行动画处理。
- UIViewImage 适合对自定义位图图像进行动画处理（当您只能在 CGLayer 中绘制圆圈时，创建位图图像并不是一个好主意）。
在我看来，还支持显示 CGLayer 序列的内容，我是否遗漏了什么？
预先感谢您的任何澄清..
Basically, I want to animate a shrinking circle. I've already done this by drawing progressively smaller circles onto CGLayer's, and then using
if(index < 30){
[self performSelector:@selector(showNextLayer) withObject:nil afterDelay:(NSTimeInterval)0.02];
index++;
}
in my showNextLayer method. This works for my simple goal, but in general is this a more or less sensible way to draw a custom animation?
Apple has a lot of documentation on animation -enough to confuse me-, but as far as I -finally- understand:
- The animation services provided by UIView is good for animating some basic view properties, view transitions etc.,
- those provided by classes that inherit from CAAnimation, are good for animating properties like color change, 3d transformations etc.
- UIViewImage is good for animating custom bitmap images (and it is not a good idea to create bitmap images when you can just draw circles into a CGLayer instead).
It seems to me that displaying the contents of a sequence of CGLayer 's would also be supported, am I missing something?
Thanks in advance for any clarification..
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