轉場動畫介紹

轉場動畫在我們日常開發中是經常遇到的，所謂轉場動畫，就是一個控制器的view切到另一個控制器的view上過程中過的動畫效果。本例子是實現了在導航控制器的titleView邊上慢慢彈出一個控制器。下面話不多說，來一起看看詳細的介紹：

效果圖：

專場前

專場後

示例代碼

首先自定義一個animator類。在需要轉場的控制器內，設置代理

 //需要設置轉場動畫的控制器titleViewVc.transitioningDelegate = aniamator//這裡的animator是animator的實例

下面是animator類中的代碼

class animatorTool: NSObject {
 lazy var isPresent = false
 var callBack : ((isPresented:Bool)->())?//向外界傳遞動畫是否正在顯示

 init(callBack : ((isPresented:Bool)->())) {
  self.callBack = callBack
 }//自定義構造方法，便於給閉包賦值
}
extension animatorTool:UIViewControllerTransitioningDelegate{
 func presentationControllerForPresentedViewController(presented: UIViewController, presentingViewController presenting: UIViewController, sourceViewController source: UIViewController) -> UIPresentationController? {
  return AWYPresentationController(presentedViewController: presented, presentingViewController: presenting)//AWYPresentationController是自定義繼承自UIPresentationController的類，是為了設置modal出來的vc的view的大小
 }
 func animationControllerForPresentedController(presented: UIViewController, presentingController presenting: UIViewController, sourceController source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
  isPresent = true
  self.callBack!(isPresented: isPresent)
  return self
 }

 func animationControllerForDismissedController(dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
  isPresent = false
  self.callBack!(isPresented: isPresent)
  return self
 }
}

extension animatorTool:UIViewControllerAnimatedTransitioning{
 func transitionDuration(transitionContext: UIViewControllerContextTransitioning?) -> NSTimeInterval {
  return 0.5//動畫時長
 }
 func animateTransition(transitionContext: UIViewControllerContextTransitioning) {
  isPresent ?animatetransitionForPresented(transitionContext) : animatetransitionForDismissed(transitionContext)
 }

 func animatetransitionForPresented(transitonContext:UIViewControllerContextTransitioning){
  let aimView = transitonContext.viewForKey(UITransitionContextToViewKey)!
  transitonContext.containerView()?.addSubview(aimView)

  aimView.transform = CGAffineTransformMakeScale(1.0, 0.0)
  UIView.animateWithDuration(transitionDuration(transitonContext), animations: {
   aimView.layer.anchorPoint = CGPointMake(0.5, 0.0)
   aimView.transform = CGAffineTransformIdentity
  }) { (_) in
   transitonContext.completeTransition(true)
  }
 }

 func animatetransitionForDismissed(transitonContext:UIViewControllerContextTransitioning){
  let aimView = transitonContext.viewForKey(UITransitionContextFromViewKey)!
  transitonContext.containerView()?.addSubview(aimView)


  UIView.animateWithDuration(transitionDuration(transitonContext), animations: {
   aimView.layer.anchorPoint = CGPointMake(0.5, 0.0)
   aimView.transform = CGAffineTransformMakeScale(1.0, 0.001)//留一點值，這樣會有動畫效果
  }) { (_) in
   transitonContext.completeTransition(true)
  }

 }


}

總結

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