//duration //設(shè)置動(dòng)畫時(shí)間
//timingFunction // 動(dòng)畫速度,何時(shí)快、慢
//
//kCAMediaTimingFunctionLinear //線性（勻速）
//kCAMediaTimingFunctionEaseIn //先慢
//kCAMediaTimingFunctionEaseOut //后慢
//kCAMediaTimingFunctionEaseInEaseOut //先慢 后慢 中間快
//kCAMediaTimingFunctionDefault //默認(rèn)
//
//type // 動(dòng)畫效果
//
//kCATransitionFade //淡出
//kCATransitionMoveIn //覆蓋原圖
//kCATransitionPush //推出
//kCATransitionReveal //底部顯出來
//
//subtype //動(dòng)畫方向
//
//kCATransitionFromRight // 右
//kCATransitionFromLeft // 左
//kCATransitionFromTop // 上
//kCATransitionFromBottom // 下


extension UIApplication {
    func cutRootVC(_ vc:UIViewController){
        
        let transition = CATransition()
        transition.duration = 0.5
        transition.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseOut)
        transition.type = kCATransitionFade
        transition.subtype = kCATransitionFromRight
        self.keyWindow?.rootViewController = vc
        self.keyWindow?.layer.add(transition, forKey: "animation")

    }
}