CGPoint相对于视图 [英] CGPoint relative to view

问题描述

考虑一个屏幕点（CGPoint）和一个视图（UIView），它位于视图层次结构中的某个位置（它可以是其他视图的子视图）。

Consider a screen point (CGPoint) and a view (UIView), which is somewhere inside the view hierarchy (it can be a subview of other views).

如何将点转换为相对于视图坐标的点？

How can you convert the point to a point relative to the view's coordinates?

推荐答案

首先，将点从屏幕坐标转换为主窗口的坐标：

First, convert the point from screen coordinates to the coordinates of your main window:

UIWindow *mainWindow = [[UIApplication sharedApplication] keyWindow];
CGPoint pointInWindowCoords = [mainWindow convertPoint:pointInScreenCoords fromWindow:nil];

其次，将点从窗口坐标转换为查看坐标：

Second, convert the point from window coords to view coords:

CGPoint pointInViewCoords = [myView convertPoint:pointInWindowCoords fromView:mainWindow];

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