UIView的clipsToBounds与CALayer的maskToBounds之间的关系如何？

问题描述

UIView 有一个 CALayer 。这很确定。但两者似乎都提供了相同的东西。

A UIView has a CALayer. That's pretty sure. But both seem to provide something that means the same thing.

如果我设置 clipsToBounds = YES ，这也设置了图层的 masksToBounds = YES ？为什么不同名字？有人知道吗？

If I'd set clipsToBounds=YES, would this also set the layer's masksToBounds=YES? Why different names? Anyone knows?

推荐答案

它们的名称不同，因为 UIView 和 CALayer 是不同的，并且具有与之关联的不同术语，但它们在功能上是等效的。如果您反汇编 clipsToBounds ，您会看到它只是调用 masksToBounds （不可思议地从模拟器框架，所以x86）：

They are different names because UIView and CALayer are different and have different terminology associated with them, but they are functionally equivalent. If you disassemble clipsToBounds you will see it just calls masksToBounds (disassmebly from the simulator framework, so x86):

-(BOOL)[UIView(Rendering) clipsToBounds]
    +0  3091938a  55              pushl    %ebp
    [phone]b  89e5            movl     %esp,%ebp
    [phone]d  e800000000      calll    0x30919392
    [phone]              popl     %ecx
    [phone]b4508          movl     0x08(%ebp),%eax
   [phone]b5004          movl     0x04(%eax),%edx         (CALayer)_layer
   [phone]b8186cb1301    movl     0x0113cb86(%ecx),%eax    masksToBounds
   [phone]f  89450c          movl     %eax,0x0c(%ebp)
   [phone]a2  895508          movl     %edx,0x08(%ebp)
   [phone]a5  c9              leave
   [phone]a6  e92e211801      jmpl     0x31a9b4d9

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