本文探讨了视图如何存储其子元素，并通过subviews数组检索这些子元素。在屏幕上，子视图总是在父视图之后绘制，遵循subviews数组中从后到前的顺序。视图的绘制模式反映了这一顺序，后期出现在数组中的视图会覆盖早期出现的视图。
Views store arrays of their children. Retrieve this array by calling [aView subviews]. Onscreen, the child views are always drawn after the parent, in the order that they appear in the subviews array.These views draw in order from back to front, and the subviews array mirrors that drawing pattern.Views that appear later in the array are drawn after views that appear earlier.
转载于:https://www.cnblogs.com/zhtf2014/archive/2010/12/28/1918963.html
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