Question

我正在做一个像这样的UIImageView动画：

//////progressbar start
progressbar.animationImages = [NSArray arrayWithObjects:
                               [UIImage imageNamed:@"1.png"],
                               [UIImage imageNamed:@"2.png"],
                               [UIImage imageNamed:@"3.png"],
                               [UIImage imageNamed:@"4.png"],
                               [UIImage imageNamed:@"5.png"],
                               [UIImage imageNamed:@"6.png"],
                               [UIImage imageNamed:@"7.png"],
                               [UIImage imageNamed:@"8.png"],
                               [UIImage imageNamed:@"9.png"],
                               [UIImage imageNamed:@"10.png"],
                               [UIImage imageNamed:@"11.png"],
                               [UIImage imageNamed:@"12.png"],
                               [UIImage imageNamed:@"13.png"],
                               [UIImage imageNamed:@"14.png"],
                               [UIImage imageNamed:@"15.png"],
                               [UIImage imageNamed:@"16.png"],
                               [UIImage imageNamed:@"17.png"],
                               [UIImage imageNamed:@"18.png"],
                               [UIImage imageNamed:@"19.png"],
                               [UIImage imageNamed:@"20.png"],
                               [UIImage imageNamed:@"21.png"],
                               [UIImage imageNamed:@"22.png"],
                               [UIImage imageNamed:@"23.png"],
                               [UIImage imageNamed:@"24.png"],
                               [UIImage imageNamed:@"25.png"],
                               [UIImage imageNamed:@"26.png"],
                               [UIImage imageNamed:@"27.png"],
                               [UIImage imageNamed:@"28.png"],
                               [UIImage imageNamed:@"29.png"],
                               [UIImage imageNamed:@"30.png"],
                               [UIImage imageNamed:@"31.png"],
                               [UIImage imageNamed:@"32.png"],
                               [UIImage imageNamed:@"33.png"],
                               [UIImage imageNamed:@"34.png"],
                               [UIImage imageNamed:@"35.png"],
                               [UIImage imageNamed:@"36.png"],
                               [UIImage imageNamed:@"37.png"],
                               [UIImage imageNamed:@"38.png"],
                               [UIImage imageNamed:@"39.png"],
                               [UIImage imageNamed:@"40.png"],
                               [UIImage imageNamed:@"41.png"],
                               [UIImage imageNamed:@"42.png"], nil];
progressbar.animationDuration = 5.00;
progressbar.animationRepeatCount = 0;
[progressbar startAnimating];

现在我需要暂停它，这样一旦用户点击按钮，图像就不会生成动画并保留在当前图像上。

我从网上获取此代码暂停，

  UIView *viewBeingAnimated = //your view that is being animated
viewBeingAnimated.frame = [[viewBeingAnimated.layer presentationLayer] frame];
[viewBeingAnimated.layer removeAllAnimations];
//when user unpauses, create new animation from current position.

该代码是否有效？另外，我如何从当前图像中取消它？

Answer 1

我也试过使用这段代码，但它没有用。

相反，您可以在以下链接中使用apple提供的代码来暂停和恢复动画。

http://developer.apple.com/library/ios/#qa/qa1673/_index.html

要让CALayer传递给pauseLayer函数，您可以使用以下代码。

CALayer *player = progressbar.layer;
[self pauseLayer:player];

Answer 2

这是我的方法：

- (IBAction)play:(id)sender
{
pauseAnimation = FALSE;
[self performSelector:@selector(changeImages) withObject:nil afterDelay:0];
[self.pauseButton setHidden:NO];
[self.playButton setHidden:YES];

}

- (IBAction)pause:(id)sender
{
pauseAnimation = TRUE;
[self.pauseButton setHidden:YES];
[self.playButton setHidden:NO];
}
- (void)changeImages
{
if (currentFrame == self.selectedAttachment.noOfFrames) 
{

    currentFrame = -1;
    return; //Don't use return, if a looped playing is required.
}
if (currentFrame == -1) {
    currentFrame = 0;
}
if (pauseAnimation) 
{
    return;
}

[self performSelector:@selector(changeImages) withObject:nil afterDelay:.5]; 

imageView.image = [frameArray objectAtIndex:currentFrame];
currentFrame ++;    
}

即使您可以更改之间的图像......

- (IBAction)replaceImage:(id)sender
{
UIImage *replaceImage = [[UIImage alloc]init];
replaceImage = [UIImage imageNamed:@"Bluehound.gif"];
int i = arc4random()%25;
[frameArray replaceObjectAtIndex:i withObject:replaceImage];
}

谢谢大家。您现在可以播放，暂停，替换图像等。 *有一个错误：再次点击播放按钮可以提高速度......：P

Answer 3

请尝试stopAnimating

[progressBar stopAnimating];

暂停UIImageView动画

3 个答案: