獲取CGPoint（位於子視圖內）的位置，W.R.T的父視圖 - ObjectiveC

Question

我有一個點在子UIView內。我想找到CGPoint相對於子視圖的父母UIView的位置。我如何得到它？

Answer 1

CGPoint pointInSuperview = [superview convertPoint:pointInSubview fromView:subView]; 

實施例：

UIView *subView = [[UIView alloc] initWithFrame:CGRectMake(50, 50, 100, 100)]; 
[self.view addSubview:subView]; 

CGPoint pointInSubview = CGPointMake(20, 20); 
CGPoint pointInSuperview = [self.view convertPoint:pointInSubview fromView:subView]; 
NSLog(@"%@", NSStringFromCGPoint(pointInSuperview)); 

打印出{70, 70}到控制檯