1. NSView 不切割sub view 超出部分
superView.layer.masksToBounds = false;
[_superView1 setWantsLayer:true];
_superView1.layer.masksToBounds = false;
_superView1.layer.backgroundColor = NSColor.redColor.CGColor;
[_subView1 setWantsLayer:true];
_subView1.layer.backgroundColor = NSColor.blueColor.CGColor;