// 返回負責轉場的控制器對象    func presentationControllerForPresentedViewController(presented: UIViewController, presentingViewController presenting: UIViewController, sourceViewController source: UIViewController) -> UIPresentationController? {        return PopoverPresentationController(presentedViewController: presented, presentingViewController: presenting)    }    // 返回提供modal動畫的對象    func animationControllerForPresentedController(presented: UIViewController, presentingController presenting: UIViewController, sourceController source: UIViewController) -> UIViewControllerAnimatedTransitioning? {        isPresented = true        return self    }    // 返回提供dismiss動畫的對象    func animationControllerForDismissedController(dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {        isPresented = false        return self    }    // 動畫時長    func transitionDuration(transitionContext: UIViewControllerContextTransitioning?) -> NSTimeInterval {        return 1.2    }    // 轉場動畫實現函數    func animateTransition(transitionContext: UIViewControllerContextTransitioning) {                }

// 設置轉場動畫代理vc.transitioningDelegate = self// 將轉場動畫設置為自定義vc.modalPresentationStyle = UIModalPresentationStyle.Custom