ios - CAAnimationGroup在动画开始时播放声音

Question

我试图在AnimationGroup的特定时间播放声音，我该怎么做。

我应该使用NSTimer还是其他计时器？

for (int i = 0; i<[bildr count];  i++) {
    ...
    CABasicAnimation *fadeInAnimation;

    if([[[bildr objectAtIndex:i] objectForKey:@"animation"] isEqualToString:@"fadeIn"])    {

        greenLeafImageView.alpha = 0.0;
        fadeInAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
        [fadeInAnimation setToValue:[NSNumber numberWithFloat:1.0]];
        fadeInAnimation.fillMode = kCAFillModeForwards;
        fadeInAnimation.removedOnCompletion = NO;
        fadeInAnimation.duration = [[[bildr objectAtIndex:i] objectForKey:@"duration"] floatValue];
        fadeInAnimation.beginTime = CACurrentMediaTime() + [[[bildr objectAtIndex:i] objectForKey:@"startTime"] floatValue];
    }else{
        // is sound -> time it
    }



    [animArray addObject:fadeInAnimation];
    [greenLeafImageView.layer addAnimation:fadeInAnimation forKey:nil];
    lastpic=i;
}

float totaltime=20.0;

CAAnimationGroup * group = [CAAnimationGroup animation];
group.animations = animArray;
group.duration = totaltime;
[self.view.layer addAnimation:group forKey:nil];

Answer 1

简短的答案，是的，NSTimer是您必须采用的路径。

我写了一个类来协调声音和动画。您可以查看here on github。此类MKSoundCoordinatedAnimationLayer，还允许您通过传递NSDictionary以及相关的图像，位置，alpha，声音和定时信息来“编写”动画，从而允许您将动画配置/保存在自己的plist中在运行时加载，而不必修改代码来调整动画。