关于交换视图的核心动画问题

Question

-(IBAction)buttonPressed1:(id)sender 
{
SignView *tempVC = [[SignView alloc] initWithNibName:@"SignView" bundle:Nil];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationTransition: UIViewAnimationTransitionCurlUp forView:self.view cache:YES];
[UIView setAnimationDelay:0.0f];
[UIView setAnimationDuration:0.2f];
[self presentModalViewController:tempVC animated:YES];
[tempVC passDataWithString:button1.titleLabel.text andColor:currentlySelectedColor isNightModeOn:nightMode.on];
[UIView commitAnimations];
} 

谁能帮我弄清楚为什么这段代码不起作用？

Answer 1

这个方法会调用beginAnimations:和commitAnimations，不能嵌套。

[self presentModalViewController:tempVC animated:YES];

所以将它移到 beginAnimations: 之前或 commitAnimations 之后。