ipad - ipad视图动画的未定义延迟问题

Question

我对以下代码有疑问。当我执行它时，首先有一个未定义的延迟[CATransaction commit]，并且CompletionBlock:. 不知道那里发生了什么。这只发生在应用程序在设备上运行时。

这是时间日志，

2013-04-22 15:59:50.893 MyApp[27038:907] ***** A   
2013-04-22 **15:59:50.894** MyApp[27038:907] ***** B  
2013-04-22 **15:59:53.161** MyApp[27038:907] ***** C  
2013-04-22 15:59:53.162 MyApp[27038:907] ***** D  
2013-04-22 15:59:53.164 MyApp[27038:907] ***** E  
2013-04-22 15:59:53.967 MyApp[27038:907] ***** F

-

NSLog(@"***** A");

[CATransaction begin];

[CATransaction setCompletionBlock:^{

    [CATransaction begin];

    NSLog(@"***** D");

    for (UIView *view in [masterTableView subviews])
    {
        if (view.tag == 501)
        {
            [view removeFromSuperview];
            break;
        }
    }

    [self.view sendSubviewToBack:masterTableView];
    [self.view bringSubviewToFront:detailView];

    CATransition *animation = [CATransition animation];
    [animation setType:kCATransitionPush];
    [animation setDuration:.8];
    [animation setSubtype:transitionFromRight?kCATransitionFromRight:kCATransitionFromLeft];
    [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];

    [CATransaction setCompletionBlock:^{

        NSLog(@"***** F");

        for (UIView *view in [detailView subviews])
        {
            if (view.tag == 502)
            {
                [view removeFromSuperview];
                break;
            }
        }

        [self addDetailView];

        [self.view sendSubviewToBack:detailView];
        [self.view bringSubviewToFront:masterTableView];

        CATransition *animation = [CATransition animation];
        [animation setType:kCATransitionPush];
        [animation setDuration:.8];
        [animation setSubtype:transitionFromRight?kCATransitionFromRight:kCATransitionFromLeft];
        [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];

        [[detailView layer] addAnimation:animation forKey:@"transition"];
    }];

    [[masterTableView layer] addAnimation:animation forKey:@"transition"];

    NSLog(@"***** E");
}];

[CATransaction begin];

[CATransaction setCompletionBlock:^{

    NSLog(@"***** C");

    for (UIView *view in [self.view subviews])
    {
        if (view.tag == 500)
        {
            [view removeFromSuperview];
            break;
        }
    }

    CATransition *animation = [CATransition animation];
    [animation setType:kCATransitionPush];
    [animation setDuration:0];
    [animation setSubtype:transitionFromRight?kCATransitionFromRight:kCATransitionFromLeft];
    [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
    [[dummyView layer] addAnimation:animation forKey:@"transition"];
}];

[CATransaction commit];

[CATransaction commit];

NSLog(@"***** B");

我是不是搞错了什么？？请帮忙。

Answer 1

当我意识到 CATransaction 创建了我动画视图的快照时。因此，该任务需要一些时间，因此会出现一些延迟。

因此，作为一个解决方案，我现在使用视图的快照图像为 UIImageView 设置动画。所以现在未定义的问题得到了解决。