core-animation
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关于iphone：在iOS上，如果CALayer的一个子类与一个空的显示方法一起使用，那么app似乎进入了无限循环？
On iOS, if a subclass of CALayer is used with an empty display method, then app seems to g…
On iOS, if a subclass of CALayer is used with an empty display method, then app seems to g…