[3]UIImageView动画播放的时间结束问题

用UIImageView 的animationImages来做动画,系统没提供具体的结束事件，发现在一些机型上动画设置的动画时间有延迟，即设置动画时间为3.0秒，结果在3.0s的时候动画没有结束，

[self performSelector:@selector(endAinimation) withObject:nil afterDelay:3.0f];

所以导致在3.0秒后调用endAinimation的时候 把动画结束了，而动画却没播放完。代码如下：

    static NSInteger const levelupImageCount = 46;

    //最后一张图片
    self.lastImagePath = [self getBundleImagePathWith:level num:levelupImageCount];
    [_levelupImageView setImage:[UIImage imageWithContentsOfFile:self.lastImagePath]];

    NSMutableArray * imageArray = [NSMutableArray array];
    for (NSInteger i = 0; i <= levelupImageCount; i++) {
         NSString * imagePath =  [self getBundleImagePathWith:level num:i];
         UIImage *image = [UIImage imageWithContentsOfFile:imagePath];
         [imageArray addObject:image];
    }
    //ImageView动画
     _levelupImageView.animationDuration = 3.0f;
     //图片播放次数,1
    _levelupImageView.animationRepeatCount = 1;
    //设置动画图片数组
    _levelupImageView.animationImages = imageArray;
    [_levelupImageView startAnimating];
    [self performSelector:@selector(endAinimation) withObject:nil afterDelay:animiationTime];

/*************升级动画结束后 添加选择和缩放动画*************/
- (void)endAinimation
 {
    [_levelupImageView stopAnimating];
    _levelupImageView.animationImages = nil;
    _cancelBtn.hidden = NO;
    _rotateImageView.hidden = NO;
    _shareBtn.hidden = NO;
    [self addRotationAnimation];
    [self addZoomAnimation];
}

为了动画结束时的精准控制，可以用CAAnimation提供的animationDidStop:(CAAnimation *)anim finished:(BOOL)flag;方法，可以精确知道动画结束事件，

    static NSInteger const levelupImageCount = 46;

    //最后一张图片
    self.lastImagePath = [self getBundleImagePathWith:level num:levelupImageCount];
    [_levelupImageView setImage:[UIImage imageWithContentsOfFile:self.lastImagePath]];

    NSMutableArray * imageArray = [NSMutableArray array];
    for (NSInteger i = 0; i <= levelupImageCount; i++) {
        NSString * imagePath =  [self getBundleImagePathWith:level num:i];
        UIImage *image = [UIImage imageWithContentsOfFile:imagePath];
        CGImageRef cgimg = image.CGImage;
        [imageArray addObject:(__bridge UIImage *)cgimg];
    }
    //创建CAKeyframeAnimation
    CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"contents"];
    animation.duration = 3.0f;
    animation.delegate = self; 
    animation.values = imageArray;
    animation.repeatCount = 1;
    [_levelupImageView.layer addAnimation:animation forKey:@"levelup_show"];
    
/*************升级动画结束后 添加选择和缩放动画*************/
- （void）animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag
 {
   [_levelupImageView.layer removeAnimationForKey:@"levelup_show"];
    _cancelBtn.hidden = NO;
    _rotateImageView.hidden = NO;
    _shareBtn.hidden = NO;
         
    [self addRotationAnimation];
    [self addZoomAnimation];
}

图片都是本地的图片 而且都是@2x的图片，用CAKeyframeAnimation加载动画的时候图片会变得特别大，若用这个方法可能图片做成@1x的大小正好能展示（由于项目用xib做的，imageView的大小就是屏幕的大小，所以设置imageView的contentMode为UIViewContentModeCenter，这样image就会一直居中，方便不同屏幕的适配）

鉴于图片的原因，优化UIImageView的animationImages结束以后endAinimation:

/*************升级动画结束后 添加选择和缩放动画*************/
- (void)endAinimation
 {
     //UIImageView的动画时间不准，如果动画还在进行就等0.2秒
     if(_levelupImageView.animating){
         [self performSelector:@selector(endAinimation) withObject:nil afterDelay:0.2];
     }else{
         [_levelupImageView stopAnimating];
         _levelupImageView.animationImages = nil;
         [_levelupImageView setImage:[UIImage imageWithContentsOfFile:self.lastImagePath]];
         _cancelBtn.hidden = NO;
         _rotateImageView.hidden = NO;
         _shareBtn.hidden = NO;
         
         [self addRotationAnimation];
         [self addZoomAnimation];
     }
}

UIImageView的动画时间不准，如果动画结束的时间到了，进入endAinimation，动画在进行就等0.2秒再进入endAinimation，一直等动画真正的结束。