視圖間坐標轉換

[cpp]  - (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
     
    UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(10.0f, 100.0f, 300.0f, 100.0f)]; 
    view1.backgroundColor = [UIColor blackColor]; 
    UIView *view2 = [[UIView alloc] initWithFrame:CGRectMake(30.0f, 20.0f, 50.0f, 50.0f)]; 
    view2.backgroundColor = [UIColor whiteColor]; 
    [view1 addSubview:view2]; 
    [self.view addSubview:view1]; 
     
    // converRect: toView  
    CGRect rect1 = [view1 convertRect:CGRectMake(30.0f, 20.0f, 50.0f, 50.0f) toView:view2]; // 將view1中的frame轉換成在view2中的frame  
    CGPoint point1 = [view1 convertPoint:CGPointMake(30.0f, 20.0f) toView:view2];           // 將view1中的point轉換成在view2中的point  
    NSLog(@"rect1:(%f,%f,%f,%f)",rect1.origin.x,rect1.origin.y,rect1.size.width,rect1.size.height); 
    NSLog(@"point1:(%f,%f)",point1.x,point1.y); 
     
    // converRect: fromView  
    CGRect rect2 = [view2 convertRect:CGRectMake(30.0f, 20.0f, 50.0f, 50.0f) fromView:view1]; // 將view1中的frame轉換成在view2中的frame(同上)  
    CGPoint point2 = [view2 convertPoint:CGPointMake(30.0f, 20.0f) fromView:view1];           // 將view1中的point轉換成在view2中的point(同上)  
    NSLog(@"rect2:(%f,%f,%f,%f)",rect2.origin.x,rect2.origin.y,rect2.size.width,rect2.size.height); 
    NSLog(@"point2:(%f,%f)",point2.x,point2.y); 
     
    // 特殊  
    CGRect rect = [view1 convertRect:CGRectMake(30.0f, 20.0f, 50.0f, 50.0f) toView:nil];     // 這view1中的frame轉換成基於窗口坐標的frame  
    NSLog(@"rect:(%f,%f,%f,%f)",rect.origin.x,rect.origin.y,rect.size.width,rect.size.height); 
     
    [view1 release]; 
    [view2 release]; 
} 

- (void)viewDidLoad
{
    [super viewDidLoad];
 
    UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(10.0f, 100.0f, 300.0f, 100.0f)];
    view1.backgroundColor = [UIColor blackColor];
    UIView *view2 = [[UIView alloc] initWithFrame:CGRectMake(30.0f, 20.0f, 50.0f, 50.0f)];
    view2.backgroundColor = [UIColor whiteColor];
    [view1 addSubview:view2];
    [self.view addSubview:view1];
   
    // converRect: toView
    CGRect rect1 = [view1 convertRect:CGRectMake(30.0f, 20.0f, 50.0f, 50.0f) toView:view2]; // 將view1中的frame轉換成在view2中的frame
    CGPoint point1 = [view1 convertPoint:CGPointMake(30.0f, 20.0f) toView:view2];           // 將view1中的point轉換成在view2中的point
    NSLog(@"rect1:(%f,%f,%f,%f)",rect1.origin.x,rect1.origin.y,rect1.size.width,rect1.size.height);
    NSLog(@"point1:(%f,%f)",point1.x,point1.y);
   
    // converRect: fromView
    CGRect rect2 = [view2 convertRect:CGRectMake(30.0f, 20.0f, 50.0f, 50.0f) fromView:view1]; // 將view1中的frame轉換成在view2中的frame(同上)
    CGPoint point2 = [view2 convertPoint:CGPointMake(30.0f, 20.0f) fromView:view1];           // 將view1中的point轉換成在view2中的point(同上)
    NSLog(@"rect2:(%f,%f,%f,%f)",rect2.origin.x,rect2.origin.y,rect2.size.width,rect2.size.height);
    NSLog(@"point2:(%f,%f)",point2.x,point2.y);
   
    // 特殊
    CGRect rect = [view1 convertRect:CGRectMake(30.0f, 20.0f, 50.0f, 50.0f) toView:nil];     // 這view1中的frame轉換成基於窗口坐標的frame
    NSLog(@"rect:(%f,%f,%f,%f)",rect.origin.x,rect.origin.y,rect.size.width,rect.size.height);
   
    [view1 release];
    [view2 release];
}輸出結果:

結論:

1、A convert xxx to B / B convert xxx from A  將視圖A中的坐標系統轉換成視圖B中的坐標系統；

2、A convert xxx to B，B為nil時將視圖A中的坐標系統轉換成窗口的坐標系統。