Question

我的代码如下，我在displayMessage

上遇到了所有问题

第一个错误是：

SigninViewController.swift：45：17：使用未解析的标识符'displayMessage'

下一个错误是：

SigninViewController.swift：87：13：“SigninViewController”类型的值没有成员'removeActivityIndicator'

import UIKit

class SigninViewController: UIViewController {

    @IBOutlet weak var userNameTextFeild: UITextField!


    @IBOutlet weak var userPasswordTextField: UITextField!
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func loginInButtonTapped(_ sender: Any) {
        print("log in button tapped")

        //Read values from text field

        let userName = userNameTextFeild.text
        let userPassword = userPasswordTextField.text

    // Check if required fields are not empty
        if(userName?.isEmpty)! || (userPassword?.isEmpty)!
        {

        // Display alert message


                print("User name \(String(describing: userName)) or password \(String(describing:userPassword)) is empty")

                displayMessage(userMessage:"one of the required feilds is missing")

                return

        }
        // Activity indicator

        let myActivityIndicator = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.gray)

        myActivityIndicator.center = view.center

        myActivityIndicator.hidesWhenStopped = false

        myActivityIndicator.startAnimating()

        view.addSubview(myActivityIndicator)


        // URL for login

        let myUrl = URL(string: "htps://198.228.12.1")
        var request = URLRequest(url:myUrl!)

        request.httpMethod = "POST"
        request.addValue("application/json", forHTTPHeaderField: "content-type")
        request.addValue("application/json", forHTTPHeaderField: "Accept")

        let postString = ["userName": userName!, "userPassword": userPassword!] as [String:String]

        do {
            request.httpBody = try JSONSerialization.data(withJSONObject: postString,
               options: .prettyPrinted)
        } catch let error  {
            print(error.localizedDescription)

            displayMessage(userMessage:"something went wrong")

            return
        }

        let task = URLSession.shared.dataTask(with: request) { (data: Data?, responce:
            URLResponse?, error: Error?) in
            self.removeActivityIndicator(activityIndicator: myActivityIndicator)

            if error != nil
            {


                self.displayMessage(userMessage: "Could not sucessfully perform this request")
                print("error=\(String(describing:error))")
                return

        }
            do{
                let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary

            } catch {

                self.remoteActivityIndicator(activityIndicator: myActivityIndicator)


                self.displayMessage(userMessage: "Could not sucessfully perform this request")
                print(error)



      }

    }
  }
}

Answer 1

首先，您确实需要将代码分解为函数。这将使调试变得更加容易，因为您将确切地知道哪个函数无法正常运行。

JSON请求应该是一个函数，解析JSON应该是另一个，如果你需要更新应该是另一个的屏幕。

现在您的错误，我没有看到displayMessage被初始化（或定义）的位置，因此您需要先创建它才能使用它。

使用未解析的标识符`displayMessage`

1 个答案: