UIView
UIView 的主要功能
// 可以修改clipsToBounds 来修改默认选项
@interface UIView(UIViewRendering)
@property(nonatomic) BOOL clipsToBounds; // When YES, content and subviews are clipped to the bounds of the view. Default is NO.
@end视图的几何机构(UIViewGeometry)
视图的层次结构(UIViewHierarchy)
视图的绘制周期
tips
视图的运行时交互模型(The Runtime Interaction Model For Views)
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