需要修改UIView的一个属性：
@property(nonatomic) BOOL clipsToBounds;
// When YES, content and subviews are clipped to the bounds of the view. Default is NO.
UIView隐藏超出superview的部分
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需要修改UIView的一个属性：
@property(nonatomic) BOOL clipsToBounds;
// When YES, content and subviews are clipped to the bounds of the view. Default is NO.
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