iOS提供了方法来完成上述值得转换 convertRect:toView:, convertRect:FromView: convertPoint:toView: and convertPoint:fromView: methods 这里以convertRect:FromView:为例,文档中对该方法的描述: Converts a point from the coordinate system of a given view to that of the receiver. 将一个指定view
iOS Programming View Controllers 视图控制器 1.1 A view controller is an instance of a subclass of UIViewController. 一个view controller 是一个UIViewController的子类. A view controller manages a view hierarchy. 一个view controller 管理一个视图树. It is responsible for c