确定视图中的某个点是否在子视图范围内 [英] Determining if a point in a view is within a subviews bounds

问题描述

假设我有一个UIView parentView和一个子视图childView，它以相对于parentView的某个未知角度旋转。确定parentView中的一个点（我知道parentView的坐标系中的坐标）是否在childView的坐标系中的矩形内是最有效的方法（矩形与其边界正交，但不等于它的边界，可能与parentView的正交不正确）边界）？

Suppose I have a UIView parentView and a subview childView that is rotated at some unknown angle relative to parentView. What is the most efficient way to determine if a point within parentView (I know the coordinates in parentView's coordinate system) is within a rectangle in childView's coordinate system (the rectangle is orthogonal to, but not equal to its bounds and probably not orthogonal to parentView's bounds)?

推荐答案

将点转换为子视图的坐标系，然后使用 CGRectContainsPoint ：

Convert the point to the subview's coordinate system and then use CGRectContainsPoint:

CGPoint pointInSubview = [subview convertPoint:pointInSuperview fromView:superview];
if (CGRectContainsPoint(rectInSubview, pointInSubview)) {
    NSLog(@"We have a winner!");
}

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