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我是 Objective C 和 X 代码的新手，我无法让我的 UIImageView 动画在屏幕上停留至少一个完整的周期。我将它用作自定义等待动画，用于点击按钮并发生一堆保存和处理的事情。我使用 NSOperationQueue 在单独的线程中执行这些操作。这是我的代码的第一部分：

我的动画是在 ViewDidLoad 中定义的，它被称为“myAnimation”。它是一个 UIImageView 动画，由 UIImages 数组组成。我立即将其设置为隐藏并在需要时显示它。

-(void)viewDidLoad
{
    [super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

    NSArray *myAnimationArray  = [[NSArray alloc] initWithObjects:
                        [UIImage imageNamed:@"arisprite_0000.png"],
                        [UIImage imageNamed:@"arisprite_0001.png"],
                        [UIImage imageNamed:@"arisprite_0002.png"],
                        [UIImage imageNamed:@"arisprite_0003.png"],
                        [UIImage imageNamed:@"arisprite_0004.png"],
                        [UIImage imageNamed:@"arisprite_0005.png"],
                        [UIImage imageNamed:@"arisprite_0006.png"],
                        [UIImage imageNamed:@"arisprite_0007.png"],
                        [UIImage imageNamed:@"arisprite_0008.png"],
                        [UIImage imageNamed:@"arisprite_0009.png"],
                        [UIImage imageNamed:@"arisprite_0010.png"],
                        [UIImage imageNamed:@"arisprite_0011.png"],
                        [UIImage imageNamed:@"arisprite_0012.png"],
                        [UIImage imageNamed:@"arisprite_0013.png"],
                        [UIImage imageNamed:@"arisprite_0014.png"],
                        [UIImage imageNamed:@"arisprite_0015.png"],
                        [UIImage imageNamed:@"arisprite_0016.png"],
                        [UIImage imageNamed:@"arisprite_0017.png"],
                        [UIImage imageNamed:@"arisprite_0018.png"],
                        [UIImage imageNamed:@"arisprite_0019.png"],
                        [UIImage imageNamed:@"arisprite_0020.png"],
                        [UIImage imageNamed:@"arisprite_0021.png"],
                        [UIImage imageNamed:@"arisprite_0022.png"],
                        [UIImage imageNamed:@"arisprite_0023.png"],
                        [UIImage imageNamed:@"arisprite_0024.png"],
                        [UIImage imageNamed:@"arisprite_0025.png"],
                        [UIImage imageNamed:@"arisprite_0026.png"],
                        [UIImage imageNamed:@"arisprite_0027.png"],
                        [UIImage imageNamed:@"arisprite_0028.png"],
                        [UIImage imageNamed:@"arisprite_0029.png"],
                        [UIImage imageNamed:@"arisprite_0030.png"],
                        [UIImage imageNamed:@"arisprite_0031.png"],
                        [UIImage imageNamed:@"arisprite_0032.png"],
                        [UIImage imageNamed:@"arisprite_0033.png"],
                        [UIImage imageNamed:@"arisprite_0034.png"],
                        [UIImage imageNamed:@"arisprite_0035.png"],
                        [UIImage imageNamed:@"arisprite_0036.png"],
                        [UIImage imageNamed:@"arisprite_0037.png"],
                               nil];


myAnimation.animationImages = myAnimationArray;
myAnimation.animationDuration = 2.5;
    [myAnimation.layer setBorderColor:[[UIColor blackColor] CGColor]];
    [myAnimation.layer setBorderWidth:2.0];

[self.view addSubview:myAnimation];
    [myAnimation setHidden:YES];
...
...
...
}

-(IBAction)saveToYYY:(id)sender
{
// hide current view and show save screen
[self showAnimatedSaveScreen];

// show the saving screen
[self.view bringSubviewToFront:savingBackgroundView];
[self.view bringSubviewToFront:savingText];
[self.view bringSubviewToFront:myAnimation];


/* Operation Queue init */
NSOperationQueue *queue = [NSOperationQueue new];

/* Create our NSInvocationOperation to call save code, passing in nil */
NSInvocationOperation *saveToYYYOperation = [[NSInvocationOperation alloc]
                                    initWithTarget:self
                                    selector:@selector(saveToYYYWithOperation)
                                    object:nil];

NSInvocationOperation *saveToXXXOperation = [[NSInvocationOperation alloc]
                                                  initWithTarget:self
                                                       selector:@selector(saveToXXXWithOperation)
                                                  object:nil];

/* Add the operation to the queue */
[saveToXXXOperation addDependency:saveToYYYOperation];
[queue addOperation:saveToYYYOperation];
[queue addOperation:saveToXXXOperation];    
}

然后，在我的最后一个队列操作中，我有

-(void)saveToXXXWithOperation
{
... 
a bunch of processing
...

[self performSelectorOnMainThread:@selector(hideAnimatedSaveScreen) withObject:nil     waitUntilDone:YES];
}

一切似乎都运行良好，除了当这些保存操作太快时，尤其是在 iPad 上，myAnimation 无法完成 2.5 的持续时间。在隐藏动画之前，我想至少播放一次。有没有办法实现这个？

4

1 回答 1

0

如果问题是“我如何在完成保存后等待 2.5 秒”，只需让您的hideAnimatedSaveScreen实现使用延迟性能 ( performSelector:withObject:afterDelay:)。您可以使用时间戳[NSDate date]（

如果问题是“我怎么知道我的动画何时完成”，这很难说，因为你实际上并没有在代码中显示任何动画，所以当你说你有一个UIImageView 动画。

于 2012-12-30T03:21:58.467 回答