CAKeyframeAnimation和音频同步

Question

我正在使用CAKeyframeAnimation在我的应用程序中执行一些动画。我想在播放动画的同时播放音频文件(有时在播放过程中，有时在播放之后)。我如何才能做到这一点？是否有针对CAKeyframeAnimation的AnimationDidStopSelector，或者是否有其他方法来实现此目的？

UIBezierPath *movePath = [UIBezierPath bezierPath];
            [movePath moveToPoint:imageAnimation.center];
            [movePath addQuadCurveToPoint:CGPointMake(839, 339)
                             controlPoint:CGPointMake(671, 316)];

            CAKeyframeAnimation *moveAnim = [CAKeyframeAnimation animationWithKeyPath:@"position"];
            moveAnim.path = movePath.CGPath;
            CAAnimationGroup *animGroup = [CAAnimationGroup animation];
            animGroup.animations = [NSArray arrayWithObjects:moveAnim, nil];
            animGroup.duration = 0.5;
            imageAnimation.layer.position = CGPointMake(839, 339);
            imageAnimation.tag = 0;
            [imageAnimation.layer addAnimation:animGroup forKey:nil];
            break;

Answer 1

实际上是有的。首先将您自己指定为代理：

animGroup.delegate = self

如果你想使用不同的动画，你可以使用KVC来区分它们：

[yourAnimation setValue:@"firstAnimation" forKey:@"animationName"];

然后实现这个方法

- (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag
{
    if (flag && [[anim valueForKey:@"animationName"] isEqualToString:@"firstAnimation"]) {
        //play your sound
    }
    else if (flag && [[anim valueForKey:@"animationName"] isEqualToString:@"secondAnimation"]) {
        //do something else
    }
}