我有一个按钮，该按钮调用animateWithDuration代码，以淡出图像，淡入文本和in的新bg颜色，然后将其重置为正常值。动画需要几秒钟才能完成，效果很好。

然而！ 有一个问题：

有时在动画结束之前会再次按下此按钮。发生这种情况时，我希望当前的动画停止并重新开始。

研究解决方案不起作用

根据我的阅读，解决方案应该很简单，只需导入QuartzCore并添加：

button.layer.removeAllAnimations()

这确实删除了动画，但是新动画/第二动画完全被弄乱了。应该隐藏的图像不是，文本永远不会显示，并且颜色转换都是错误的。发生了什么！？！

//Animate Finished feedback in footer bar
func animateFinished(textToDisplay: String, footerBtn: UIButton, footerImg: UIImageView) {

    //Should cancel any current animation
    footerBtn.layer.removeAllAnimations()

    footerBtn.alpha = 0
    footerBtn.setTitle(textToDisplay, forState: UIControlState.Normal)
    footerBtn.titleLabel!.font = UIFont(name: "HelveticaNeue-Regular", size: 18)
    footerBtn.setTitleColor(UIColor(red: 255/255.0, green: 255/255.0, blue: 255/255.0, alpha: 1.0), forState: UIControlState.Normal)
    footerBtn.backgroundColor = UIColor(red: 217/255.0, green: 217/255.0, blue: 217/255.0, alpha: 1.0)

    UIView.animateWithDuration(0.5, delay: 0.0, options: nil, animations: {
        footerImg.alpha = 0.01 //Img fades out
        footerBtn.backgroundColor = UIColor(red: 46/255.0, green: 163/255.0, blue: 00/255.0, alpha: 0.6)
        }
        , completion: { finished in

            UIView.animateWithDuration(0.5, delay: 0.0, options: nil, animations: {
                footerBtn.alpha = 1 //Text fades in
                footerBtn.backgroundColor = UIColor(red: 46/255.0, green: 208/255.0, blue: 11/255.0, alpha: 0.6)
                }
                , completion: { finished in

                    UIView.animateWithDuration(0.5, delay: 1.0, options: nil, animations: {
                        footerBtn.alpha = 0.01 //Text fades out
                        footerBtn.backgroundColor = UIColor(red: 46/255.0, green: 173/255.0, blue: 00/255.0, alpha: 0.6)
                        }
                        , completion: { finished in

                            UIView.animateWithDuration(0.5, delay: 0.0, options: nil, animations: {
                                footerImg.alpha = 1 //Img fades in
                                }
                                , completion: { finished in
                                    footerBtn.backgroundColor = UIColor.clearColor()
                                    footerBtn.setTitleColor(UIColor(red: 55/255.0, green: 55/255.0, blue: 55/255.0, alpha: 1.0), forState: UIControlState.Normal)
                                    footerBtn.titleLabel!.font = UIFont(name: "HelveticaNeue-Light", size: 18)
                                    footerBtn.setTitle("", forState: UIControlState.Normal)
                                    footerBtn.alpha = 1
                                    //Completion blocks sets values back to norm
                            })
                    })
            })
    })
}//End of animation

@Shripada建议我切换到关键帧以获取更具可读性的代码。关键帧格式如下。它没有解决动画中断问题。如果您可以嵌套或关键帧格式解决问题，请发布它！

func animateFinished(textToDisplay: String, footerBtn: UIButton, footerImg: UIImageView) {
    //Should cancel any current animation
    footerBtn.layer.removeAllAnimations()

    footerBtn.alpha = 0
    footerBtn.setTitle(textToDisplay, forState: UIControlState.Normal)
    footerBtn.titleLabel!.font = UIFont(name: "HelveticaNeue-Regular", size: 18)
    footerBtn.setTitleColor(UIColor(red: 255/255.0, green: 255/255.0, blue: 255/255.0, alpha: 1.0), forState: UIControlState.Normal)
    //footerBtn.backgroundColor = UIColor(red: 217/255.0, green: 217/255.0, blue: 217/255.0, alpha: 1.0)

    UIView.animateKeyframesWithDuration(3.0 /*Total*/, delay:0.0, options: UIViewKeyframeAnimationOptions.CalculationModeLinear, animations: {

            UIView.addKeyframeWithRelativeStartTime(0.0, relativeDuration:0.10, animations:{
                footerImg.alpha = 0.01 //Img fades out
                footerBtn.backgroundColor = UIColor(red: 46/255.0, green: 103/255.0, blue: 00/255.0, alpha: 0.6) //Bg turns to green
            })

            UIView.addKeyframeWithRelativeStartTime(0.10, relativeDuration:0.30, animations:{
                footerBtn.alpha = 1 //Text and green bg fades in
                footerBtn.backgroundColor = UIColor(red: 46/255.0, green: 173/255.0, blue: 11/255.0, alpha: 0.6) //BG turns greener
            })

            UIView.addKeyframeWithRelativeStartTime(0.40, relativeDuration:0.50, animations:{
                footerBtn.alpha = 0.01 //Text fades out & bg fade out
            })

        },
        completion: {  finished in
            footerImg.alpha = 1
            footerBtn.alpha = 1
            footerBtn.backgroundColor = UIColor.clearColor()
            footerBtn.setTitleColor(UIColor(red: 55/255.0, green: 55/255.0, blue: 55/255.0, alpha: 1.0), forState: UIControlState.Normal)
            footerBtn.titleLabel!.font = UIFont(name: "HelveticaNeue-Light", size: 18)
            footerBtn.setTitle("", forState: UIControlState.Normal)
            //Completion blocks sets values back to norm
        }
    )
}//End of 'Finished' animation