ios - 在动画中移动 UIView 时隐藏它

Question

我有一些动画使用 beginAnimations 进行一些旋转。我想隐藏有问题的 UIview，当然我尝试更改隐藏属性但没有任何反应。这是代码

 CGAffineTransform rotation = CGAffineTransformMakeRotation( angelToRotate(-90));
[UIView beginAnimations: @"" context: NULL];
self.view.hidden = TRUE;
[UIView setAnimationDuration: 0.4];
self.view.transform = CGAffineTransformConcat(self.view.transform, rotation);
self.view.hidden = FALSE;
[UIView commitAnimations];

我也尝试更改 View 上的 Alpha，但仍然没有任何效果。

有什么想法吗？

Answer 1

CGAffineTransform rotation = CGAffineTransformMakeRotation( angelToRotate(-90));   
[UIView animateWithDuration:0.4 animations:^
{
    self.view.transform = CGAffineTransformConcat(self.view.transform, rotation);
    self.view.alpha = 0.0;
}
completion:^(BOOL finished)
{
    self.view.alpha = 1.0;
}];

或者:

---

CGAffineTransform rotation = CGAffineTransformMakeRotation( angelToRotate(-90));
[UIView beginAnimations:nil context: NULL];
[UIView setAnimationDuration:0.4];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)];
self.view.transform = CGAffineTransformConcat(self.view.transform, rotation);
self.view.alpha = 0.0;
[UIView commitAnimations];

---

- (void) animationDidStop: (NSString *) animationID finished: (NSNumber *) finished context: (void *) context
{
    self.view.alpha = 1.0;
}