ios - 无法使用parentViewController (Swift) 关闭viewController

Question

我试图像这样关闭 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 呈现它，有时从 picker (UIImagePicker Controller )呈现它。我试图通过访问父级来关闭它，但是 if 语句中没有任何代码正在执行。似乎找不到 Controller 。有什么想法我可能在这里做错了吗？任何帮助将非常感激!谢谢!

Answer 1

呈现的 View Controller 没有父级，它有一个呈现器。这可能会令人困惑。

您可以发送dismissViewControllerAnimated(_:completion:)到呈现的 View Controller 以使其自行消失:

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

或者您可以向 View Controller 询问其正在呈现的 View Controller ，并要求呈现者关闭所呈现的:

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