ios - 如何从 UIViewController 的扩展中为两个不同的 Controller 返回两个不同的呈现 Controller ？

Question

这是我的分机:

extension UIViewController: UIViewControllerTransitioningDelegate {

    func presentAssignBookToClassesViewController(controller: BWAssignBookToClassesViewController) {

        controller.modalPresentationStyle = .Custom
        controller.transitioningDelegate = self
        controller.preferredContentSize = CGSizeMake(500, 575)

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

    func presentSettingsStoryboard() {

        if let settingsController = UIStoryboard(name: "TeacherSettingsStoryboard", bundle: nil).instantiateInitialViewController() {

            settingsController.modalPresentationStyle = .Custom
            settingsController.transitioningDelegate = self
            settingsController.preferredContentSize = CGSizeMake(500, 575)

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

    //MARK: - UIViewControllerTransitioningDelegate

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

        return BWOverlayPresentationController(presentedViewController: presented, presentingViewController: presenting)
    }
}

在 presentationControllerForPresentedViewController: 中，我需要根据调用的方法返回 BWOverlayPresentationController 或 BWSettingsPresentationController。如何实现？

Answer 1

你可以简单地通过restorationIdentifier来区分它们(你可以简单地使用storyboard来设置):

//MARK: - UIViewControllerTransitioningDelegate

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

    if presented.restorationIdentifier == BWSettingsRestorationIdentifier {
        return BWSettingsPresentationController(presentedViewController: presented, presentingViewController: presenting)
    } else {
        return BWOverlayPresentationController(presentedViewController: presented, presentingViewController: presenting)
    }
}