core-animation - 背景颜色的 CAKeyframeAnimation ... 导致崩溃

Question

我用这段代码枚举了一个数组，它崩溃了。我认为这是因为我错误地包装了颜色，但我应该如何通过它们？

    CAKeyframeAnimation *iAnimation = [CAKeyframeAnimation animationWithKeyPath:@"backgroundColor"];
    NSArray *iTimes;
    NSArray *iValues;
    NSInteger iTag = iButton.tag;

    iTimes = [NSArray arrayWithObjects:
              [NSNumber numberWithFloat:(iTimeBlock * iTag)],
              [NSNumber numberWithFloat:(iTimeBlock * iTag + 1)],
              [NSNumber numberWithFloat:iTimeBlock * (iTag + 2)], nil];

    iValues = [NSArray arrayWithObjects:
               iButton.backgroundColor,
               iButton.color, // my subclass has this property
                       iButton.backgroundColor, nil];

    [iAnimation setKeyTimes:iTimes];
    [iAnimation setValues:iValues];
    [iAnimation setDuration:21.0];
    [iButton.layer addAnimation:iAnimation
                         forKey:@"FlashColor"];

Answer 1

    iValues = [NSArray arrayWithObjects:
               (id)iButton.backgroundColor.CGColor,
               (id)iButton.color.CGColor,
               (id)iButton.backgroundColor.CGColor,
               nil];

Answer 2

要获得 UIButton 的颜色，您可以这样做：

[iButton 背景颜色];

你可能不需要这些东西：

[NSValue valueWithBytes:iButton.backgroundColor objCType:@encode(UIColor)],