iOS 将 UIAlertAction 移至屏幕顶部

Question

我目前正在尝试添加一个包含 3 个文本字段的警报。我在消息中添加了多个\n 以使 UIAlertController 更大。但是，当键盘出现时，它会阻止确定和取消按钮。因此，我想知道是否有办法将 UIAlertController 移到屏幕上更高的位置以防止按钮被挡住。

    let alert = UIAlertController(title: "", message: "\n\n\n\n\n\n\n\n\n", preferredStyle: UIAlertController.Style.alert)
    alert.view.addSubview(textField1)
    alert.view.addSubview(textField2)
    alert.view.addSubview(textField3)
    let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertAction.Style.default) { (_) in
        //
    }
    let okAction = UIAlertAction(title: "Cancel", style: UIAlertAction.Style.default) { (_) in
        //
    }
    alert.addAction(okAction)
    alert.addAction(cancelAction)
    self.present(alert, animated: true, completion: {})

Answer 1

UIAlertController包含 addTextField(configurationHandler: ((UITextField) -> Void)?您可以直接使用文本字段的属性，例如，您可以像下面这样使用

let alertController = UIAlertController(title: "", message: "\n\n\n\n\n\n\n\n\n", preferredStyle: .alert)
    alertController.addTextField { (textField : UITextField!) -> Void in
        textField.placeholder = "Enter First Name"
    }
    alertController.addTextField { (textField : UITextField!) -> Void in
        textField.placeholder = "Enter Second Name"
    }
    alertController.addTextField { (textField : UITextField!) -> Void in
        textField.placeholder = "Enter Third Name"
    }
    let saveAction = UIAlertAction(title: "Save", style: .default, handler: { alert -> Void in
        let firstTextField = alertController.textFields?.first as! UITextField
        let secondTextField = alertController.textFields![1] as UITextField
        let thirdTextField = alertController.textFields?.last as! UITextField
          print("firstName \(firstTextField.text), secondName \(secondTextField.text),thirdName \(thirdTextField.text)" )
    })
    let cancelAction = UIAlertAction(title: "Cancel", style: .default, handler: { (action : UIAlertAction!) -> Void in })
    alertController.addAction(saveAction)
    alertController.addAction(cancelAction)
    self.present(alertController, animated: true, completion: nil)

例如，您可以从 here 获得示例教程