swift - 自定义 UIAlertController - 应用程序尝试以模态方式呈现事件 Controller

Question

应用程序试图以模态方式呈现事件 Controller

我正在尝试创建自定义 UIAlertController。因此，来自不同地方的人将更容易合作。但我收到了这个错误:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Application tried to present modally an active controller

class CustomAlert: UIAlertController,  UIImagePickerControllerDelegate, UINavigationControllerDelegate  {

    private static var sheet : UIAlertController = UIAlertController()
    static let instance = CustomAlert()

    func create(title: String, message: String) -> CustomAlert {
        CustomAlert.sheet = UIAlertController(title: title, message: message, preferredStyle: .actionSheet)
        return self
    }

    func addlibrary() -> CustomAlert{
        let libraryAction = UIAlertAction(title: "library", style: .default, handler: nil)
        CustomAlert.sheet.addAction(libraryAction)
        return self
    }

    func show(on vc : UIViewController){
          UIApplication.shared.keyWindow?.rootViewController?.present(vc, animated: true, completion: nil)

    }
}

问题出在哪里？谢谢

Answer 1

您正试图在您的 show 方法中显示错误的 Controller 。

改变:

UIApplication.shared.keyWindow?.rootViewController?.present(vc, animated: true, completion: nil)

到:

vc.present(self, animated: true, completion: nil)