UIDynamicAnimator in swift ios 7

Question

我的iPad應用程序有一個頁面需要使用UIDynamicAnimator進行開發。我在下面添加了一段代碼。它根據我的需要在iOS8中完美工作，但在iOS7上失敗。當強制更改框架彈跳時，我不會重複呼叫委託。

private var bounceCount:Int = 0 
private var animator:UIDynamicAnimator! 
private var animateWithBounce:Bool = Yes 

override func viewWillAppear(animated: Bool) { 
    super.viewWillAppear(animated) 

// Do any additional setup. 
if(self.animateWithBounce==Yes) { 

self.hideAnimationViews() 

var rect:CGRect = self.bounceView.frame 
rect.origin.y = 319 
self.bounceView.frame = rect 
self.bounceCount = 0 

var animator:UIDynamicAnimator = UIDynamicAnimator(referenceView: self.bounceContainerView) 

var gravityBehavior:UIGravityBehavior = UIGravityBehavior(items: [self.bounceView]) 
gravityBehavior.gravityDirection = CGVector(dx: 0.0, dy: -1.0) 
gravityBehavior.magnitude = 1.0 
animator.addBehavior(gravityBehavior) 

var collisionBehavior:UICollisionBehavior = UICollisionBehavior(items: [self.bounceView]) 
collisionBehavior.translatesReferenceBoundsIntoBoundary = Yes; 
collisionBehavior.collisionDelegate = self; 
animator.addBehavior(collisionBehavior) 

var elasticityBehavior:UIDynamicItemBehavior = UIDynamicItemBehavior(items: [self.bounceView]) 
elasticityBehavior.elasticity = 0.8; 
animator.addBehavior(elasticityBehavior) 

self.animator = animator 
    } 
} 

// MARK: - UICollisionBehaviorDelegate methods 

func collisionBehavior(behavior: UICollisionBehavior, endedContactForItem item: UIDynamicItem, withBoundaryIdentifier identifier: NSCopying) { 
    var rect:CGRect = self.bounceView.frame 

    if(self.bounceCount==0) { 
     rect.origin.y = 79.25 
    } 
    else if(self.bounceCount==1) { 
     rect.origin.y = 19.25 
    } 
    else if(self.bounceCount==2) { 
     rect.origin.y = 09.25 
    } 
    else if(self.bounceCount==3) { 
     self.startAnimationOnViews() 
    } 

    self.bounceView.frame = rect 

    bounceCount = bounceCount+1 
} 

// MARK: - 

private func hideAnimationViews() 
{ 
//some views hided here 
} 

private func startAnimationOnViews() 
{ 
UIView.animateKeyframesWithDuration(duration, delay: delay, options: options, animations: { 

UIView.addKeyframeWithRelativeStartTime(0, relativeDuration: time1, animations: { 
//some views showing on first time slot 
}) 

UIView.addKeyframeWithRelativeStartTime(time1, relativeDuration: time2, animations: { 
//some views showing on second time slot 
}) 

}, completion: {finished in 
//recursive call 
}) 
} 

我正在使用XCode 6.1.0，與iOS7的應用程序兼容性。基地SDK的iOS 8.1

var Yes:Bool { return true } 
var No:Bool { return false } 

這些像宏或一些應用在全球範圍內共享以提高可讀性

感謝支持提前。

Answer 1

的問題是這一行：

self.bounceView.frame = rect 

您的動態動畫的控制下改變視圖的幀，動態動畫師的背後。這是非法的。我很驚訝你的代碼有史以來工作。動態動畫設計師的整個觀點是，它是設置它所控制的視圖的框架的那個人。

要做到這一點，不能逃避動態動畫製作者的注意，只需撥打updateItemUsingCurrentState即可。這就是它的目的。