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我的 iPad 应用程序有一个页面需要使用 UIDynamicAnimator 进行开发。我在下面添加了一些代码。根据我的需要，它在 iOS8 中完美运行，但在 iOS7 上失败。当强行将框架更改为弹跳时，我不会重复调用委托。

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，iOS7 的应用程序兼容性。基础 SDK iOS 8.1

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

这些在应用程序中全局共享，例如宏或其他东西，以提高可读性

提前感谢您的支持。

4

1 回答 1

3

问题是这一行：

self.bounceView.frame = rect

您正在动态动画师的控制下更改视图的框架，在动态动画师的背后。那是非法的。我很惊讶你的代码曾经工作过。动态动画师的全部意义在于它设置了它所控制的视图的框架。

要以不引起动态动画师注意的方式执行此操作，只需调用updateItemUsingCurrentState. 这就是它的用途。

于 2014-11-21T15:04:21.293 回答