问用于CAShapeLayer动画的完成块

EN

[CATransaction begin];

for (int i = 0; i < MAX_NUM_LIGHTS; i++)
{
    NSUInteger c = [colorsArray count];

    CAShapeLayer *l = (CAShapeLayer*)llayers[i];

    // the fill color after the anim is complete
    [l setFillColor:((UIColor*)colorsArray[(i+index)%c]).CGColor];

    CABasicAnimation *fillColorAnimation = [CABasicAnimation animationWithKeyPath:@"fillColor"];
    fillColorAnimation.duration = 2.0f;
    fillColorAnimation.toValue = (id)((UIColor*)colorsArray[(i+index)%c]).CGColor;
    fillColorAnimation.repeatCount = 0;
    fillColorAnimation.autoreverses = FALSE;

    [l addAnimation:fillColorAnimation forKey:@"fillColor"];

}

[CATransaction setCompletionBlock:^
{
    if (currEffect != LpyEffect_MultiBall) return;

    NSUInteger c = [colorsArray count];
    int r = (index+1)%c;
    [self simMultiBallEffect:r]; // recursive call, new index
}];

[CATransaction commit];