音乐跳动动画

 CAReplicatorLayer *replicatorLayer = [[CAReplicatorLayer alloc] init];

       replicatorLayer.frame=CGRectMake(10,100,30,30);

       replicatorLayer.instanceCount=4;

       replicatorLayer.instanceTransform  =CATransform3DMakeTranslation(8, 0, 0);

       replicatorLayer.instanceDelay=0.2;

       replicatorLayer.masksToBounds=YES;

       replicatorLayer.backgroundColor = [UIColor yellowColor].CGColor;

       CALayer*layer = [CALayerlayer];

       layer.frame=CGRectMake(0,30,2,30);

       layer.backgroundColor = [UIColor redColor].CGColor;

       [replicatorLayeraddSublayer:layer];

       [self.view.layeraddSublayer:replicatorLayer];

       CABasicAnimation *animation = [CABasicAnimation animation];

       animation.keyPath=@"position.y";

       animation.duration=0.5;

       animation.toValue=@30;

       animation.autoreverses=YES;

       animation.repeatCount=MAXFLOAT;

       [layeraddAnimation:animationforKey:nil];