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轉場動畫介紹
轉場動畫在我們?nèi)粘i_發(fā)中是經(jīng)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(xiàn)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
專場后
示例代碼
首先自定義一個animator類。在需要轉場的控制器內(nèi),設置代理
//需要設置轉場動畫的控制器titleViewVc.transitioningDelegate = aniamator//這里的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,便于給閉包賦值 } 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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