OC convertRect

举个例子:

    redView = [[UIView alloc]initWithFrame:CGRectMake(50, 100, 100, 100)];
    redView.backgroundColor = [UIColor redColor];
    [self.view addSubview:redView];
    
    
    blueView = [[UIView alloc]initWithFrame:CGRectMake(50, 350, 100, 100)];
    blueView.backgroundColor = [UIColor blueColor];
    [self.view addSubview:blueView];
//    这句代码的意思是blueView中的redView相对于self.view中的位置
    CGRect rect = [self.view convertRect:redView.frame  fromView:blueView];

// x:100.000000  y:450.000000   100.000000   height:100.000000

在redView上,blueview相对于blueview的位置

    CGRect rect = [blueView convertRect:blueView.frame  fromView:redView];
//    x:50.000000  y:100.000000   100.000000   height:100.000000

   

    
//    这句代码的意思是在blueView中,定义一个目标区域,该区域相对于window的位置(nil代表的是self.view.window)
    CGRect rect =  [blueView convertRect:CGRectMake(50, 500, 20, 20) toView:nil];
    
     x:100.000000  y:850.000000   20.000000   height:20.000000
    
    
    
//    CGRect rect =  [blueView convertRect:CGRectMake(150, 100, 20, 20) toView:redView];
    
//     x:50.000000  y:750.000000   20.000000   height:20.000000
    
    
 
// 将像素point由point所在视图转换到目标视图view中,返回在目标视图view中的像素值
- (CGPoint)convertPoint:(CGPoint)point toView:(UIView *)view;
// 将像素point从view中转换到当前视图中,返回在当前视图中的像素值
- (CGPoint)convertPoint:(CGPoint)point fromView:(UIView *)view;
 
// 将rect由rect所在视图转换到目标视图view中,返回在目标视图view中的rect
- (CGRect)convertRect:(CGRect)rect toView:(UIView *)view;
// 将rect从view中转换到当前视图中,返回在当前视图中的rect
- (CGRect)convertRect:(CGRect)rect fromView:(UIView *)view;
 
例把UITableViewCell中的subview(btn)的frame转换到 controllerA中
 
// controllerA 中有一个UITableView, UITableView里有多行UITableVieCell,cell上放有一个button
// 在controllerA中实现:
CGRect rc = [cell convertRect:cell.btn.frame toView:self.view];
或
CGRect rc = [self.view convertRect:cell.btn.frame fromView:cell];
// 此rc为btn在controllerA中的rect
 
或当已知btn时:
CGRect rc = [btn.superview convertRect:btn.frame toView:self.view];
或
CGRect rc = [self.view convertRect:btn.frame fromView:btn.superview];
原文地址:https://www.cnblogs.com/hualuoshuijia/p/6846110.html