如何从 swift 中的 KeychainWrapper 保存和检索值

Question

I have saved uid in otpButn.. i am retrieving uid in registerButn.. but i am getting nil because i am taping registerBtn before otpButn.. so how can i save globally uid i mean how to store all registered persons uid in keychainWrapper and retrieve it in regterBtn.. please help me in below code.

I am getting nil in uid.. please help me how to store and retrive uid in keychainwrapper to check if the user is exist or not while registration.

here is my code:

import UIKit
class RegistrationViewController: UIViewController, UITextFieldDelegate {

//MARK:- Outlets
@IBOutlet weak var nameTextField: UITextField!
@IBOutlet weak var phoneNumTextField: UITextField!
@IBOutlet weak var passwordTextField: UITextField!
@IBOutlet weak var conformPasswordTextField: UITextField!
@IBOutlet weak var otpTextField: UITextField!
@IBOutlet weak var registerButton: UIButton!
@IBOutlet weak var sendOtpButton: UIButton!
var otpField: Int?
var Uid: Int?
override func viewDidLoad() {
    super.viewDidLoad()
    self.phoneNumTextField.keyboardType = .phonePad
    otpTextField.isHidden = true
}

func textFieldShouldReturn(_ textField: UITextField) -> Bool {
    textField.resignFirstResponder()
    return true
}
//MARK:- ButtonActions
@IBAction func registerButton(_ sender: Any) {

    if (nameTextField.text ==  "" || phoneNumTextField.text == "" || passwordTextField.text ==  "" || conformPasswordTextField.text == "")
    {
        registerButton.isHidden = false
        sendOtpButton.isHidden = true
        AlertFun.ShowAlert(title: "Title", message: "RequiredAllFields", in: self)
    }
    else{
        registerButton.isHidden = true
        sendOtpButton.isHidden = false
        otpTextField.isHidden = false
        DispatchQueue.main.async {
            self.otpTextField.text = self.otpField as? String
        }
        registerService()
        }
}
@IBAction func sendOTPButton(_ sender: Any) {
    otpService()
}

//MARK:- Service part
@objc func registerService(){

    print("register tapped")

    let parameters = ["mobile_number": Int(phoneNumTextField.text ?? "") as Any,
                      "password":passwordTextField.text as Any,
                      "name": nameTextField.text as Any]

    let url = URL(string: "https://dev.anyemi.com/webservices/anyemi/register")
    var req =  URLRequest(url: url!)
    req.httpMethod = "POST"
    guard let httpBody = try? JSONSerialization.data(withJSONObject: parameters, options: .prettyPrinted) else {return}
    req.httpBody = httpBody
    let session = URLSession.shared
    session.dataTask(with: req, completionHandler: {(data, response, error) in
        if response != nil {
            // print(response)
        }
        if let data = data {
            do{
                let userId: Int? = KeychainWrapper.standard.integer(forKey: "Uid")

                print("the keychain uid \(userId)")
                if userId != nil{
                    AlertFun.ShowAlert(title: "Title", message: "already exists", in: self)
                }
                else{
                let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as! [String: Any]
                print("the json regggggggggggis \(json)")
                self.otpField = json["otp"] as? Int
                }
            }catch{
                print("error")
            }
        }
    }).resume()
}
@objc func otpService(){

    let parameters = ["mobile_number": phoneNumTextField.text as Any,
                      "otp": otpTextField.text as Any]
    let url = URL(string: "https://dev.anyemi.com/webservices/anyemi/otpverify")
    var req =  URLRequest(url: url!)
    req.httpMethod = "POST"
    guard let httpBody = try? JSONSerialization.data(withJSONObject: parameters, options: .prettyPrinted) else {return}
    req.httpBody = httpBody
    let session = URLSession.shared
    session.dataTask(with: req, completionHandler: {(data, response, error) in
        if response != nil {
            // print(response)
        }
        if let data = data {
            do{
                let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as! [String: Any]
                print("the json of otppppppppp \(json)")
                DispatchQueue.main.async {
                    if (self.otpTextField.text == String(self.otpField ?? 1)){
                        print("registration successfullllll...")
                        let mobileNum = json["mobile_number"] as! [String : Any]
                         self.Uid = mobileNum["id"] as? Int
                        print("otp Uid \(String(describing: self.Uid))")
                        DispatchQueue.main.async {
                            KeychainWrapper.standard.set(self.Uid!, forKey: "Uid")
                        }
                        let loginVC = self.storyboard?.instantiateViewController(withIdentifier: "ViewController") as! ViewController
                        self.present(loginVC, animated: true)
                    }
                    else {
                        print("register fail")
                    }
                }
            }catch{
                print("error")
            }
        }
    }).resume()
}
}

Answer 1

You can refer below link for save and retrieve values from KeyChainWrapper

https://github.com/jrendel/SwiftKeychainWrapper

And After Integrate this you just need to create one function with completion handler:

 func isUserExist(handleComplete:@escaping ((Bool)->())) {

        let userId: String? = KeychainWrapper.standard.string(forKey: "Uid")
        DispatchQueue.main.async {
            if userId != nil{
                AlertFun.ShowAlert(title: "Title", message: "This user is Already exist", in: self)
                handleComplete(false)
            }else{
                handleComplete(true)
            }
        }

    }

and call this function where you want to check validate for Uid like this:

      self.isUserExist { isExxist in
                if isExxist {
                    self.registerService()
                    self.otpTimer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(self.update), userInfo: nil, repeats: true)
                }else{
                  //here you can do whatever you want
                }

            }