iOS，Swift，UIAlertController，UIAlertAction - 如何在按下按钮时关闭动画？

Question

当在此UIAlertController上按下按钮时，它会自动关闭动画。我可以关闭动画吗？

我尝试过以动画形式呈现：虚假但仍然以动画效果解散。

      func showOKMessage(title: String, message : String) {
        self.alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
        let okAction = UIAlertAction(title: "OK", style: .default)
        self.alertController.addAction(okAction)
        self.present(self.alertController, animated: true)
  }

Answer 1

首先我尝试的是创建一个UIAlertController的引用来处理在处理程序中将dismiss(animated:completion:)中的动画设置为false（将在您之后执行的代码）按下UIAlertAction的<确定按钮）

import UIKit

class ViewController: UIViewController {

  var alert: UIAlertController!

  @IBAction func alertViewButtonPressed(_ sender: UIButton) {
    alert = UIAlertController(title: "", message: "Hello", preferredStyle: .alert)
    let action = UIAlertAction(title: "OK", style: .default) { _ in
      // this code executes after you hit the OK button
      self.alert.dismiss(animated: false, completion: nil)
    }
    alert.addAction(action)
    self.present(alert, animated: true)
  }
}

不幸的是动画仍在那里：

对我有用的唯一方法就是override dismiss(animated:completion:)方法，并在super到false的调用中设置动画标记。您也不需要向处理程序添加代码，也没有理由为该解决方案创建引用。 （注意：现在每个呈现的视图控制器在该视图控制器中没有动画时被解除）：

import UIKit

class ViewController: UIViewController {

  @IBAction func alertViewButtonPressed(_ sender: UIButton) {
    let alert = UIAlertController(title: "", message: "Hello", preferredStyle: .alert)
    let action = UIAlertAction(title: "OK", style: .default, handler: nil)
    alert.addAction(action)
    self.present(alert, animated: true)
  }

  override func dismiss(animated flag: Bool, completion: (() -> Void)? = nil) {
    // view controller which was presented modally by the view controller gets dismissed now without animation
    super.dismiss(animated: false, completion: completion)
  }
}

现在警报视图在没有动画的情况下被解雇：