我想暂停 UIImageView 动画，根据我的研究，可以停止图像的动画，但无法暂停序列。通过在 UIImageView 上调用语句 stopAnimating，则它会停止动画并使图像视图变空。
要暂停 UIImages 的动画，必须使用 NSTimer。
我已经在应用程序中使用一个 NSTimer，以在不同的时间间隔后一个接一个地加载 view controllers。每个 view controller 中都有一个 UIImages 的幻灯片展示。
问题是当暂停计时器时，view controllers 停止加载，但此时正在显示的 view controller 仍然反复显示该 view controller 中的 UIImages 幻灯片展示，直到恢复暂停。因此，我想暂停那个幻灯片展示。
这就是我在使用 NSTimer 的地方。
-(void)playpauseAction:(id)sender {
if([audioPlayer isPlaying])
{
[sender setImage:[UIImage imageNamed:@"Play Icon.png"] forState:UIControlStateSelected];
[audioPlayer pause];
[self pauseTimer];
}else{
[sender setImage:[UIImage imageNamed:@"pause.png"] forState:UIControlStateNormal];
[audioPlayer play];
[self resumeTimer];
if(isFirstTime == YES)
{
self.timer = [NSTimer scheduledTimerWithTimeInterval:11.0
target:self
selector:@selector(displayviewsAction:)
userInfo:nil
repeats:NO];
isFirstTime = NO;
}
}
}
这是displayviewsAction如何在不同的时间间隔后依次加载11个视图控制器。
- (void)displayviewsAction:(id)sender
{
First *firstController = [[First alloc] init];
firstController.view.frame = CGRectMake(0, 0, 320, 480);
CATransition *transitionAnimation = [CATransition animation];
[transitionAnimation setDuration:1];
[transitionAnimation setType:kCATransitionFade];
[transitionAnimation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn]];
[self.view.layer addAnimation:transitionAnimation forKey:kCATransitionFade];
[self.view addSubview:firstController.view];
[self.view addSubview:toolbar];
[firstController release];
self.timer = [NSTimer scheduledTimerWithTimeInterval:23 target:self selector:@selector(Second) userInfo:nil repeats:NO];
}
-(void)Second
{
Second *secondController = [[Second alloc] init];
secondController.view.frame = CGRectMake(0, 0, 320, 480);
CATransition *transitionAnimation = [CATransition animation];
[transitionAnimation setDuration:1];
[transitionAnimation setType:kCATransitionReveal];
[transitionAnimation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn]];
[self.view.layer addAnimation:transitionAnimation forKey:kCATransitionReveal];
[self.view addSubview:secondController.view];
[self.view addSubview:toolbar];
[secondController release];
self.timer = [NSTimer scheduledTimerWithTimeInterval:27 target:self selector:@selector(Third) userInfo:nil repeats:NO];
}
这就是在视图控制器中启动图像动画的方法。
// Displays UIImageView
UIImageView* ImageView = [[UIImageView alloc] initWithFrame:CGRectMake(10, 5, 300, 235)];
self.view.backgroundColor = [UIColor brownColor];
// load all the frames of our animation
ImageView.animationImages = [NSArray arrayWithObjects:
[UIImage imageNamed:@"1a.png"],
[UIImage imageNamed:@"1b.png"],
nil];
// all frames will execute in 25 seconds
ImageView.animationDuration = 25;
// start animating
[ImageView startAnimating];
ImageView.layer.borderWidth = 2;
ImageView.layer.borderColor = [[UIColor whiteColor]CGColor];
[ImageView.layer setMasksToBounds:YES];
[ImageView.layer setCornerRadius:15.0f];
[baseView addSubview:ImageView];
现在，如果有人能引导我如何在 NSTimer 暂停时暂停这个 UIImage 动画 的幻灯片播放，谢谢帮忙。