Question

在我的应用中，我通过自定义相机捕捉图像。因此，在拍摄图像时，我正在呈现控制器，因此它在中心显示相机并且看起来像捕捉图像。这是它的代码

    let layerVC = cameraLayerViewController(nibName: "cameraLayerViewController", bundle: nil)
            layerVC.modalPresentationStyle = .custom

            Global.appDelegate.window?.rootViewController?.presentedViewController?.present(layerVC, animated: false, completion: nil)

            DispatchQueue.main.asyncAfter(deadline: .now() + 0.4, execute: {

                layerVC.dismiss(animated: false, completion: nil)
}

但在更改相机模式时，我在同一个控制器上显示另一个控制器

if (UserDefaults.standard.value(forKey: Global.g_UserDefaultKey.isFrontCamera) as? Bool == true)
    {
        UserDefaults.standard.set(false, forKey: Global.g_UserDefaultKey.isFrontCamera)
        let controller : CameraVC = CameraVC(nibName: "CameraVC", bundle: nil)

        self.present(controller, animated: false, completion: nil)
    }
    else
    {
        UserDefaults.standard.set(true, forKey: Global.g_UserDefaultKey.isFrontCamera)
        let controller : CameraVC = CameraVC(nibName: "CameraVC", bundle: nil)
        self.present(controller, animated: false, completion: nil)
    }

现在当我在这个控制器上时，我试图让任何控制器无效。

    let layerVC = cameraLayerViewController(nibName: "cameraLayerViewController", bundle: nil)
            layerVC.modalPresentationStyle = .custom

            Global.appDelegate.window?.rootViewController?.presentedViewController?.present(layerVC, animated: false, completion: nil)

            DispatchQueue.main.asyncAfter(deadline: .now() + 0.4, execute: {

                layerVC.dismiss(animated: false, completion: nil)
}

所以让我知道如何在已经呈现的控制器上呈现控制器。

Answer 1

从根目录呈现第一个视图控制器：

let root = UIApplication.shared.keyWindow!.rootViewController!
let firstPresented = FirstViewController()
firstPresented.transitioningDelegate = yourPresentationDelegate
firstPresented.modalPresentationStyle = .custom
root.present(firstPresented, animated: false, completion: nil)

要present第二个视图控制器，因为它已经呈现，所以你不能再次present来自根目录，所以你必须present来自当前呈现的内容（self let secondPresented = SecondViewController() secondPresented.transitioningDelegate = yourPresentationDelegate secondPresented.modalPresentationStyle = .custom self.present(secondPresented, animated: false, completion: nil) 1}}）：

ngModelGroup

如何在已经提交的控制器

1 个答案: