//由要转换坐标view的superView执行该方法，rect为待转换view的frame，view是要显示到哪儿的

- (CGRect)convertRect:(CGRect)rect toView:(UIView *)view;

//由要转换到哪儿的view执行，rect为待转换view的frame，view是待转换view的superView

- (CGRect)convertRect:(CGRect)rect fromView:(UIView *)view;

- (void)viewDidLoad {

    [super viewDidLoad];

    self.view.backgroundColor = [UIColor whiteColor];

    UIView *grayView = [[UIView alloc]initWithFrame:CGRectMake(, , kScreenWidth, )];

    grayView.backgroundColor = [UIColor lightGrayColor];

    [self.view addSubview:grayView];

    UIView *brownView = [[UIView alloc]initWithFrame:CGRectMake(, , , )];

    brownView.backgroundColor = [UIColor brownColor];

    [grayView addSubview:brownView];

    CGRect sonRectInController = [brownView.superview convertRect:brownView.frame toView:self.view];

    CGRect sonRectInController2 = [self.view convertRect:brownView.frame fromView:brownView.superview];

    NSLog(@"自己的%@", NSStringFromCGRect(brownView.frame));

    NSLog(@"父类的%@", NSStringFromCGRect(sonRectInController));

    NSLog(@"父类的2%@", NSStringFromCGRect(sonRectInController2));

}