ios - 尺度变换如何影响边界和变换？

Question

缩放视图的三种方法：

    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
    [view setBackgroundColor:[UIColor redColor]];
    [self.view addSubview:view];
    view.transform = CGAffineTransformMakeScale(0.5, 0.5);
    view.layer.affineTransform = CGAffineTransformMakeScale(0.5, 0.5);
    view.layer.transform = CATransform3DMakeScale(0.5, 0.5, 0);
    NSLog(@"%@",NSStringFromCGRect(view.bounds));
    NSLog(@"%@",NSStringFromCGRect(view.frame));

输出是

2013-03-13 23:55:02.492 {{0, 0}, {1024, 768}}
2013-03-13 23:55:02.495 {{256, 192}, {512, 384}}

我不知道为什么在制作比例后边界没有改变，而只是框架改变了。