Question

我在我的项目上创建了动画，它在2 UIWebView之间交换。当我在iOS 3.2上开发时，动画一切都很好。但是当我搬到iOS 4.2时突然出现了一切：



    //LeftView Animation

    [UIView beginAnimations:@"leftPortrait" context:nil];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDuration:1.0f];
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:leftView cache:YES];
    [leftWebView setFrame:CGRectMake(0, 0, 384, 916)];
    [UIView commitAnimations];

    //RightView Animation
    [UIView beginAnimations:@"rightPortrait" context:nil];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDuration:1.0f]; 
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:rightView cache:YES];
    [rightWebView setFrame:CGRectMake(0, 0, 384, 916)];
    [UIView commitAnimations];

//LeftView Animation [UIView beginAnimations:@"leftPortrait" context:nil]; [UIView setAnimationDelegate:self]; [UIView setAnimationDuration:1.0f]; [UIView setAnimationBeginsFromCurrentState:YES]; [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:leftView cache:YES]; [leftWebView setFrame:CGRectMake(0, 0, 384, 916)]; [UIView commitAnimations]; //RightView Animation [UIView beginAnimations:@"rightPortrait" context:nil]; [UIView setAnimationDelegate:self]; [UIView setAnimationDuration:1.0f]; [UIView setAnimationBeginsFromCurrentState:YES]; [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:rightView cache:YES]; [rightWebView setFrame:CGRectMake(0, 0, 384, 916)]; [UIView commitAnimations];

谢谢！

Answer 1

尝试使用基于块的动画。

它们更干净，更流畅，也是目前Apple的做事方式。从[UIView beginAnimations：context：]切换到基于块的动画也最近修复了我的代码中的动画问题。

在您的情况下，一个简单的基于块的动画版本将是[UIView animateWithDuration:1.0f animations:^{[leftWebView setFrame:CGRectMake(0, 0, 384, 916)];}。您可能希望使用-[UIView animateWithDuration:delay:options:animations:animations:completion:]来设置其他选项以及动画完成时应执行的代码。

iOS 4.2上的动画有什么问题？

1 个答案: