Swift:插入带文本输入的警告框(和存储文本输入)

Question

在我的一个 viewController 中，我想让一个 alert box 出现，提示 user 键入此信息。然后，我希望用户使用 NSUserDefaults 存储此输入。我怎样才能做到这一点？

提前致谢!

Answer 1

检查一下:

let alertController = UIAlertController(title: "Email?", message: "Please input your email:", preferredStyle: .alert)

let confirmAction = UIAlertAction(title: "Confirm", style: .default) { (_) in
  guard let textFields = alertController.textFields,
    textFields.count > 0 else {
      // Could not find textfield
      return
  }

  let field = textFields[0]
  // store your data
  UserDefaults.standard.set(field.text, forKey: "userEmail")
  UserDefaults.standard.synchronize()
}

let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { (_) in }

alertController.addTextField { (textField) in
  textField.placeholder = "Email"
}

alertController.addAction(confirmAction)
alertController.addAction(cancelAction)

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