Background: I have a custom scrollview (subclassed) that has uiimageviews on it that are draggable, based on the drags I need to draw some lines dynamically in a subview of the uiscrollview. (Note I need them in a subview as at a later point i need to change the opacity of the view.)Background: I have a custom scrollview (subclas
阅读背景：
在视图之间划分界限的最佳方法是什么?
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