ios - 当我改变 UIVIew 的 bounds.size.height 时 frame.origin.y 改变

Question

(我的英文不是很好哈哈)

我定义了一个 UIView 对象作为 subview ，当我改变 subview.bounds.size.height 时，subview.frame.origin.y 改变了，我的代码有什么问题吗？

这是我的代码:

- (IBAction)touch
{
    static int i = 1;
    NSLog(@"%d: Bounds: %@", i, NSStringFromCGRect(self.subView.bounds));
    NSLog(@"%d: Frame: %@", i, NSStringFromCGRect(self.subView.frame));
    self.subView.bounds = CGRectMake(0.f, 0.f, self.subView.bounds.size.width, self.subView.bounds.size.height + 50);
    NSLog(@"%d: Bounds: %@", i, NSStringFromCGRect(self.subView.bounds));
    NSLog(@"%d: Frame: %@", i, NSStringFromCGRect(self.subView.frame));

    i++;
}

系统输出:

2011-12-23 12:11:29.316 Angry[7959:f803] 1: Bounds: {{0, 0}, {320, 100}}
2011-12-23 12:11:29.318 Angry[7959:f803] 1: Frame: {{0, 0}, {320, 100}}
2011-12-23 12:11:29.319 Angry[7959:f803] 1: Bounds: {{0, 0}, {320, 150}}
2011-12-23 12:11:29.320 Angry[7959:f803] 1: Frame: {{0, -25}, {320, 150}}

2011-12-23 12:11:30.920 Angry[7959:f803] 2: Bounds: {{0, 0}, {320, 150}}
2011-12-23 12:11:30.921 Angry[7959:f803] 2: Frame: {{0, -25}, {320, 150}}
2011-12-23 12:11:30.922 Angry[7959:f803] 2: Bounds: {{0, 0}, {320, 200}}
2011-12-23 12:11:30.923 Angry[7959:f803] 2: Frame: {{0, -50}, {320, 200}}

2011-12-23 12:11:32.080 Angry[7959:f803] 3: Bounds: {{0, 0}, {320, 200}}
2011-12-23 12:11:32.082 Angry[7959:f803] 3: Frame: {{0, -50}, {320, 200}}
2011-12-23 12:11:32.083 Angry[7959:f803] 3: Bounds: {{0, 0}, {320, 250}}
2011-12-23 12:11:32.084 Angry[7959:f803] 3: Frame: {{0, -75}, {320, 250}}

Answer 1

改变边界确实会影响框架:

Although you can change the frame, bounds, and center properties independent of the others, changes to one property affect the others in the following ways:

• When you set the frame property, the size value in the bounds property changes to match the new size of the frame rectangle. The value in the center property similarly changes to match the new center point of the frame rectangle.
• When you set the center property, the origin value in the frame changes accordingly.
• When you set the size of the bounds property, the size value in the frame property changes to match the new size of the bounds rectangle.