实现 UIAlertController 时遇到问题。无法提醒出现

Question

我已将警报设置为在某些用户尝试通过 firebase 请求新密码但无法正常工作时出现任何错误时显示。

正在打印 print("problems with email field") 所以我相信我在编写警告部分时出错了。

@IBAction func recuperarSenha(_ sender: Any) {

    Auth.auth().sendPasswordReset(withEmail: self.loginTextView.text!) { error in
        if error != nil {
            print("problems with email field")

            let alert = UIAlertController(title: "Couldn't send recover message", message: "Check if e-mail field is properly filled.", preferredStyle: .alert)
            alert.addAction(UIAlertAction(title: "OK!", style: .default, handler: nil))

        }
    }
}

Answer 1

您需要在创建提醒后展示您的提醒。添加动作后添加如下代码：

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

您的代码的编辑版本：

@IBAction func recuperarSenha(_ sender: Any) {

  Auth.auth().sendPasswordReset(withEmail: self.loginTextView.text!) { error in
    if error != nil {
        print("problems with email field")

        let alert = UIAlertController(title: "Couldn't send recover message", message: "Check if e-mail field is properly filled.", preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "OK!", style: .default, handler: nil))
        self.present(alert, animated: true, completion: nil)


    }
  }
}

实现 UIAlertController 时遇到问题。无法提醒出现

Trouble implementing UIAlertController. Cant get alert to show up

alert

ios

firebase

swift

uialertcontroller