ios - 无法使用 parentViewController (Swift) 关闭 viewController

Question

我正在尝试像这样关闭 View Controller :

func cropViewController(cropViewController: TOCropViewController!, didFinishCancelled cancelled: Bool) {

        if let vc = cropViewController.parentViewController {
            print("has controller")
            vc.dismissViewControllerAnimated(true, completion: nil)
        }

    }

TOCropViewController 是 UIViewController 的子类。有时我从 self 显示它，有时从 picker (一个 UIImagePicker Controller )显示它。我试图通过访问父级来关闭它，但是 if 语句中的代码都没有执行。它似乎无法找到 Controller 。任何想法我可能在这里做错了什么？任何帮助将非常感激!谢谢!

Answer 1

呈现的 View Controller 没有父对象，它有一个呈现器。这可能会造成混淆。

您可以发送dismissViewControllerAnimated(_:completion:)到呈现的 View Controller 让它自己消失:

If you call this method on the presented view controller itself, UIKit asks the presenting view controller to handle the dismissal.

或者你可以向 View Controller 询问它的呈现 View Controller ，并要求呈现器关闭呈现的 View Controller :

    if let vc = cropViewController.presentingViewController {
        print("has presenter")
        vc.dismissViewControllerAnimated(true, completion: nil)
    }