如何在UIStoryboardSegue中實現UIViewControllerTransitioningDelegate？

Question

這就是我現在做的事：

func presentOverlayController(controller: UIViewController) { 

    controller.modalPresentationStyle = .Custom 
    controller.transitioningDelegate = self 

    presentViewController(controller, animated: true, completion: nil) 
} 

//MARK: - UIViewControllerTransitioningDelegate 

public func presentationControllerForPresentedViewController(presented: UIViewController, presentingViewController presenting: UIViewController, sourceViewController source: UIViewController) -> UIPresentationController? { 
    return OverlayPresentationController(presentedViewController: presented, presentingViewController: presenting) 
} 

它工作得真棒。首先，我使用.instantiateViewControllerWithIdentifier:從故事板獲取控制器。控制器給出的正確方法：

但同樣的結果，我需要實現我的自定義賽格瑞：

class OverlaySegue: UIStoryboardSegue, UIViewControllerTransitioningDelegate { 

    override func perform() { 

     destinationViewController.modalPresentationStyle = .Custom 
     destinationViewController.transitioningDelegate = self 
    } 

    //MARK: - UIViewControllerTransitioningDelegate 

    func presentationControllerForPresentedViewController(presented: UIViewController, presentingViewController presenting: UIViewController, sourceViewController source: UIViewController) -> UIPresentationController? { 
     return OverlayPresentationController(presentedViewController: presented, presentingViewController: presenting) 
    } 
} 

，但它不工作。爲什麼？

Answer 1

在perform的結尾處，您需要致電presentViewController(destinationViewController, animated: true, completion: nil)。