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
專場后
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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