swift – 为UIViewPropertyAnimator的fractionComplete设置动画以模糊背景

概述因此,当您在主屏幕上向下滚动时,我正在使用新的UIViewPropertyAnimator和UIVisualEffectView来实现与Spotlight搜索相同的功能,并使背景模糊. 我正在使用fractionComplete属性来设置平移UIView时要模糊多少的过程. animator = UIViewPropertyAnimator(duration: 1, curve: .linear) 因此,当您在主屏幕上向下滚动时,我正在使用新的UIVIEwPropertyAnimator和UIVisualEffectVIEw来实现与Spotlight搜索相同的功能,并使背景模糊.

我正在使用fractionComplete属性来设置平移UIVIEw时要模糊多少的过程.

animator = UIVIEwPropertyAnimator(duration: 1,curve: .linear) {        self.blurEffectVIEw.effect = nil    }

并且模糊度的变化值在0.0-1.0之间.

animator?.fractionComplete = blurValue

但是当我取消平移手势时,我希望模糊从其所处的位置动画回到无模糊(例如,〜> 1.0),持续时间为0.4毫秒.

现在我只是在取消平移手势时将fractionComplete设置为1.0.相反,我想要动画它.
我已经尝试了UIVIEw.animate(withDuration ..但它不会影响UIVIEwPropertyAnimators fractionComplete,这是模糊UIVisualEffectVIEw的唯一方法.

有任何想法吗？

解决方法 似乎fractionComplete有一个BUG(我在Stackoverflow上的问题： UIViewPropertyAnimator does not update the view when expected),rdar://30856746.该属性只将状态从非活动状态设置为活动状态,但不更新视图,因为(我假设)还有另一个内部状态不会触发.

要解决此问题,您可以执行以下 *** 作：

animator.startAnimation() // This will change the `state` from inactive to activeanimator.pauseAnimation() // This will change `isRunning` back to false,but the `state` will remain as active// Now any call of `fractionComplete` should update your vIEw correctly!animator.fractionComplete = /* your value here */

这是一个可以玩的游乐场片段：

let liveVIEw = UIVIEw(frame: CGRect(x: 0,y: 0,wIDth: 400,height: 50))liveVIEw.backgroundcolor = .whitePlaygroundPage.current.needsIndefiniteExecution = truePlaygroundPage.current.liveVIEw = liveVIEwlet square = UIVIEw(frame: CGRect(x: 0,wIDth: 50,height: 50))square.backgroundcolor = .redliveVIEw.addSubvIEw(square)let animator = UIVIEwPropertyAnimator.init(duration: 5,curve: .linear)animator.addAnimations {    square.frame.origin.x = 350}let blurVIEw = UIVisualEffectVIEw(effect: UIBlurEffect(style: .dark))blurVIEw.frame = liveVIEw.boundsliveVIEw.addSubvIEw(blurVIEw)animator.addAnimations {    blurVIEw.effect = nil}// If you want to restore the blur after it was animated,you have to // safe a reference to the effect which is manipulatedlet effect = blurVIEw.effectanimator.addCompletion {    // In case you want to restore the blur effect    if  == .start { blurVIEw.effect = effect }}animator.startAnimation()animator.pauseAnimation()dispatchQueue.main.asyncAfter(deadline: .Now() + 2) {    animator.fractionComplete = 0.5}dispatchQueue.main.asyncAfter(deadline: .Now() + 4) {    // decIDe the direction you want your animation to go.    // animator.isReversed = true    animator.startAnimation()}

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