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ios - 如何在 swift 中的 Uibutton 中运行异步函数

问题描述

我希望 getUserToken 函数和 userLogin 函数在下一行（即 Firebase 身份验证）之前运行。让它异步运行

    @IBAction func loginButtonPressed(_ sender: UIButton) {


    self.showSpinner(onView: self.view)

    guard var phoneNumber = phoneTextField.getRawPhoneNumber()    else { return }
    phoneNumber = "+234\(phoneNumber)"

    guard var userPhoneNumber = phoneTextField.getRawPhoneNumber()  else { return }
    userPhoneNumber = "234\(userPhoneNumber)"

    guard let userName = nameTextField.text else {return}
    print(phoneNumber) 
    getUserAcessToken()
    userLogin()

    //Validate Required fields are mnot empty
    if nameTextField.text == userName  {

        //Firebase Manipulation
        PhoneAuthProvider.provider().verifyPhoneNumber(phoneNumber, uiDelegate: nil) { (verificationId, error) in
            if error == nil {

                print(verificationId!)

                //UserDefaults Database manipulation for  Verification ID
                guard let verifyid = verificationId else {return}
                self.defaults.set(verifyid, forKey: "verificationId")
                self.defaults.synchronize()


                self.removeSpinner()
            }else {

                print("Unable to get secret verification code from   Firebase", error?.localizedDescription as Any)

                let alert = UIAlertController(title: "Please enter correct email and phone  number", message: "\n", preferredStyle: .alert)
                alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
                self.present(alert, animated: true, completion: nil)
                return

            }


        }

    }
    let OTPRequestVC =   storyboard?.instantiateViewController(withIdentifier: "OTPRequestViewController") as! OTPRequestViewController
    OTPRequestVC.userId = userId
    OTPRequestVC.userEmailData = userEmail
    self.present(OTPRequestVC, animated: true)

}

我希望这两个函数在 firebase 身份验证之前异步运行。

标签： iosswift

解决方案

在不复制整个预期功能的情况下，您要遵循的模式是：

func loginButtonPressed(_ sender: UIButton) {
    // Any immediate changes to the UI here
    // ...

    // Start time consuming task in background
    DispatchQueue.global(qos: .userInitiated).async {
        getUserAccessToken()
        userLogin()

        // Make your Firebase call
        PhoneAuthProvider.provider().verifyPhoneNumber(phoneNumber, uiDelegate: nil) { (verificationId, error) in

            // Any response validation here
            // ...

            DispatchQueue.main.async {
                // Any UI updates here

            }
        }
    }
}

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