如何在UIStoryboardSegue中实现UIViewControllerTransitioningDelegate？

Question

这就是我现在所做的：

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)
}

它的效果非常棒。首先，我使用

.instantiateViewControllerWithIdentifier:

从情节提要中获取控制器。控制器以正确的方式呈现：

但我需要用我的自定义segue实现相同的结果：

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)
    }
}

但它不起作用。为什么？

Answer 1

在

perform

结束时，您需要致电

presentViewController(destinationViewController, animated: true, completion: nil)

。