求助 Animation, 为何 Zoom Out 不是在中心点缩小，anchorPoint 又没有重置。

从raywenderlich 找了一份源码思路是：

- (void) addSubviewWithZoomInAnimation:(UIView*)view duration:(float)secs option:(UIViewAnimationOptions)option
{
// first reduce the view to 1/100th of its original dimension
CGAffineTransform trans = CGAffineTransformScale(view.transform, 0.01, 0.01);
view.transform = trans; // do it instantly, no animation
[self addSubview:view];
// now return the view to normal dimension, animating this tranformation
[UIView animateWithDuration:secs delay:0.0 options:option
animations:^{
view.transform = CGAffineTransformScale(view.transform, 100.0, 100.0);
}
completion:nil];
}

- (void) removeWithZoomOutAnimation:(float)secs option:(UIViewAnimationOptions)option
{
[UIView animateWithDuration:secs delay:0.0 options:option
animations:^{
self.transform = CGAffineTransformScale(self.transform, 0.01, 0.01);
}
completion:^(BOOL finished) {
[self removeFromSuperview];
}];
}

我借鉴了下，Zoom in 倒是没有问题。 为何Zoom out 不是在中心点缩小了


源码地址在这边，有兴趣的帮我看一看谢谢了。
http://pan.baidu.com/s/1jG2vWLS