重新动画渐变背景与不同的颜色迅速在ios

概述我想在动画时重新设置不同颜色的渐变背景动画. 我可以使用此代码成功为渐变颜色设置动画. let dayTopColor = CommonUtils.colorWithHexString("955EAC")let dayBottomColor = CommonUtils.colorWithHexString("9F3050")let dayToTopColor = CommonUtils.col 我想在动画时重新设置不同颜色的渐变背景动画.
我可以使用此代码成功为渐变颜色设置动画.

let daytopcolor = CommonUtils.colorWithHexString("955EAC")let dayBottomcolor = CommonUtils.colorWithHexString("9F3050")let dayTotopcolor = CommonUtils.colorWithHexString("D15B52")let dayToBottomcolor = CommonUtils.colorWithHexString("CC4645")let nighttopcolor = CommonUtils.colorWithHexString("2D5E7C")let nightBottomcolor = CommonUtils.colorWithHexString("19337D")let nightTotopcolor = CommonUtils.colorWithHexString("21334E")let nightToBottomcolor = CommonUtils.colorWithHexString("101A55")var isInSaudiarabia = falsevar gradIEnt : CAGradIEntLayer?var tocolors : AnyObject?var fromcolors : AnyObject?func animateBackground(){        var layerToRemove: CAGradIEntLayer?        for layer in self.vIEw.layer.sublayers!{            if layer.isKindOfClass(CAGradIEntLayer) {                layerToRemove = layer as? CAGradIEntLayer            }        }        layerToRemove?.removeFromSuperlayer()            self.gradIEnt!.colors = [nighttopcolor.CGcolor,nightBottomcolor.CGcolor]            self.tocolors = [nightTotopcolor.CGcolor,nightToBottomcolor.CGcolor]        self.vIEw.layer.insertSublayer(self.gradIEnt!,atIndex: 0)        animateLayer()    }    func animateLayer(){        self.fromcolors = self.gradIEnt!.colors!        self.gradIEnt!.colors = self.tocolors as? [AnyObject]        let animation : CABasicAnimation = CABasicAnimation(keyPath: "colors")        animation.delegate = self        animation.fromValue = fromcolors        animation.tovalue = tocolors        animation.duration = 3.50        animation.removedOnCompletion = true        animation.fillMode = kCAFillModeForwards        animation.timingFunction = camediatimingFunction(name: kcamediatimingFunctionlinear)        animation.delegate = self        self.gradIEnt!.addAnimation(animation,forKey:"animateGradIEnt")    }    overrIDe func animationDIDStop(anim: CAAnimation,finished flag: Bool) {        self.tocolors = self.fromcolors;        self.fromcolors = self.gradIEnt!.colors!        animateLayer()    }

CommonUtils.colorWithHexString()是一个将十六进制颜色转换为UIcolor的函数.
顺便说一句,当我尝试在动画时将背景颜色更改为日间颜色时,背景渐变颜色变得闪烁.

有谁知道解决方案.

解决方法 问题是当你删除图层时,它会停止动画.但是当动画停止时,仍然会调用animationDIDStop,这将启动一个新动画本身.所以,你要删除停止动画的图层,立即启动另一个图层,但是你要开始另一个动画.你有决斗动画.

您可以在animationDIDStop调用animateLayer之前检查标记以查看动画是否正确完成.

overrIDe func animationDIDStop(anim: CAAnimation,finished flag: Bool) {    if flag {        tocolors = fromcolors;        fromcolors = gradIEnt!.colors!        animateLayer()    }}

就个人而言,我不确定你为什么要删除,添加和删除图层.如果你是,我不确定为什么你不只是渐变？.removeFromSuperlayer()而不是迭代层.

无论如何,我只是将渐变层保留在那里,只需检查其presentationLayer并从那里开始动画：

class VIEwController: UIVIEwController {    overrIDe func vIEwDIDLoad() {        super.vIEwDIDLoad()        fromcolors = [daytopcolor.CGcolor,dayBottomcolor.CGcolor]        tocolors = [dayTotopcolor.CGcolor,dayToBottomcolor.CGcolor]        gradIEnt = CAGradIEntLayer()        gradIEnt!.colors = fromcolors!        gradIEnt!.frame = vIEw.bounds        vIEw.layer.addSublayer(gradIEnt!)        animateLayer()    }    let daytopcolor = CommonUtils.colorWithHexString("955EAC")    let dayBottomcolor = CommonUtils.colorWithHexString("9F3050")    let dayTotopcolor = CommonUtils.colorWithHexString("D15B52")    let dayToBottomcolor = CommonUtils.colorWithHexString("CC4645")    let nighttopcolor = CommonUtils.colorWithHexString("2D5E7C")    let nightBottomcolor = CommonUtils.colorWithHexString("19337D")    let nightTotopcolor = CommonUtils.colorWithHexString("21334E")    let nightToBottomcolor = CommonUtils.colorWithHexString("101A55")    var gradIEnt : CAGradIEntLayer?    var tocolors : [CGcolor]?    var fromcolors : [CGcolor]?    var day = true    func toggleFromDayToNight() {        day = !day        if day {            fromcolors = [daytopcolor.CGcolor,dayBottomcolor.CGcolor]            tocolors = [dayTotopcolor.CGcolor,dayToBottomcolor.CGcolor]        } else {            fromcolors = [nighttopcolor.CGcolor,nightBottomcolor.CGcolor]            tocolors = [nightTotopcolor.CGcolor,nightToBottomcolor.CGcolor]        }        let colors = (gradIEnt!.presentationLayer() as! CAGradIEntLayer).colors // save the in-flight current colors        gradIEnt!.removeAnimationForKey("animateGradIEnt")                      // cancel the animation        gradIEnt!.colors = colors                                               // restore the colors to in-flight values        animateLayer()                                                          // start animation    }    func animateLayer() {        let animation : CABasicAnimation = CABasicAnimation(keyPath: "colors")        animation.fromValue = gradIEnt!.colors        animation.tovalue = tocolors        animation.duration = 3.50        animation.removedOnCompletion = true        animation.fillMode = kCAFillModeForwards        animation.timingFunction = camediatimingFunction(name: kcamediatimingFunctionlinear)        animation.delegate = self        gradIEnt!.colors = tocolors        gradIEnt!.addAnimation(animation,finished flag: Bool) {        if flag {            swap(&tocolors,&fromcolors)            animateLayer()        }    }    @IBAction func dIDTapbutton() {        toggleFromDayToNight()    }}

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