textFiledMin.text = textFiledMin.text?.safelyLimitedTo(length: 3) //if u use this, need code below TextLengthsMax.swift

import UIKit

private var __maxLengths = [UITextField: Int]()

extension UITextField {

    @IBInspectable var maxLength: Int {

        get {

            guard let l = __maxLengths[self] else {

                return 3 // (global default-limit. or just, Int.max)

            }

            return l

        }

        set {

           __maxLengths[self] = newValue

            addTarget(self, action: #selector(fix), for: .editingChanged)

        }

    }

    @objc func fix(textField: UITextField) {

        let t = textField.text

        textField.text = t?.safelyLimitedTo(length: maxLength)

    }

}



extension String

{

    func safelyLimitedTo(length n: Int)->String {

        if (self.count <= n) {

            return self

        }

        return String( Array(self).prefix(upTo: n) )

    }

}

override func viewWillAppear(_ animated: Bool) {



        let userDefault = UserDefaults()

        if let data = userDefault.object(forKey: "savePlatMobil") {

            if let message = data as? String {

                self.platNo.text = message

            }

        }

        platNo.text = platNo.text?.safelyLimitedTo(length: 2)

    }

 

import UIKit

class PassUserDafaultViewController: UIViewController {
    @IBOutlet weak var textFieldUser: UITextField!
    
    override func viewDidLoad() {
        super.viewDidLoad()


    }

    @IBAction func passingDataUser(_ sender: Any) {
        let userDefault = UserDefaults()
        userDefault.set(textFieldUser.text, forKey: "saveDataRecive")
    }
    
}

import UIKit

class SecondNotifViewController: UIViewController {
    @IBOutlet weak var notifLabel: UILabel!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
     
    }
  
    @IBAction func saveData(_ sender: UIButton) {
        
        let vc = P2ViewController()
        navigationController?.pushViewController(vc, animated: false)


    }
    


}
    

import UIKit

class P2ViewController: UIViewController {

    @IBOutlet weak var labelPass: UILabel!
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        

 

    }

    
    override func viewWillAppear(_ animated: Bool) {
        let userDefault = UserDefaults()
        if let data = userDefault.object(forKey: "saveDataRecive") {
            if let message = data as? String {
                self.labelPass.text = message
            }
        }
    }
    
   

}

This my note as my problem and solution @luffyselah

import Alamofire
import SwiftyJSON
import UIKit

class LoginViewController: UIViewController, UITextFieldDelegate {
    
    
    @IBOutlet var emailTField: UITextField!
    @IBOutlet var passTField: UITextField!

@IBAction func bMasuk(_ sender: Any) {
        guard let email = emailTField.text, !(emailTField.text?.isEmpty)! else { return }
        guard let password = passTField.text, !(passTField.text?.isEmpty)! else { return }
        
        let vcbMasuk = HomeTabBarController()
        let urlLis = "https://yourbaseUrl/ios/v1/auth/login"
        
        let parameter: Parameters = [
            "email": email,
            "password": password
        ]
        
            
            Alamofire.request(urlLis, method: .post, parameters: parameter, encoding: URLEncoding.default, headers: nil)
                .validate(statusCode: 200..<300)
                .responseJSON { response in
                    
                    switch response.result {
                    case .success(let data):
                        print("isi: \(data)")
                        
                        self.navigationController?.pushViewController(vcbMasuk, animated: true)
                        
                    case .failure(let error):
                        alert.addAction(UIAlertAction(title: "Close", style: .default, handler: { (_: UIAlertAction) in
                            print("OK")
                        }))
                        
                        self.present(alert, animated: true, completion: nil)
                        print("need text")
                        print("Request failed with error: \(error)")
                 }
            }
    }

• Use tap Gesture Recognizer in your viewcontroller, and add Action like this below

@IBAction func didTapScreen(_ sender: Any) {
        
  
        
    }

• First textField (textField1) setting Return Key --> Next

• Second textField (textField2) setting Return Key --> Done

• This full code in viewController.swift

import UIKit

class CustomKeyViewController: UIViewController, UITextFieldDelegate {

    @IBOutlet weak var textField1: UITextField!
    @IBOutlet weak var textField2: UITextField!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        textField1.delegate = self
        textField2.delegate = self
    }
    
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        if textField1.isFirstResponder {
            textField2.becomeFirstResponder()
        } else {
            textField2.resignFirstResponder()
        }
        return false
    }
    
    // need item tap gesture recognizer
    @IBAction func didTapScreen(_ sender: Any) {
        
        if textField1.isFirstResponder {
            textField1.resignFirstResponder()
        } else if textField2.isFirstResponder {
            textField2.resignFirstResponder()
        }
        
    }
    
}

@IBAction func bMasuk(_ sender: Any) {
        
        let alert = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
        
        alert.addAction(UIAlertAction(title: "Upload", style: .default, handler: nil))
        alert.addAction(UIAlertAction(title: "Contoh Foto", style: .default, handler: { action in
            
            let vc = ContohFotoViewController()
            self.present(vc, animated: true, completion: nil)
            
        }))

        alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
        
        self.present(alert, animated: true)
    }



-- use alert notif (.alert)





        @IBAction func bMasuk(_ sender: Any) {
        
            
            let alert = UIAlertController(title: "Login failed", message: "Your text", preferredStyle: .alert)
            alert.addAction(UIAlertAction(title: "Close", style: .default, handler: { (action: UIAlertAction) in
                print("OK")
            }))
            
            self.present(alert, animated: true, completion: nil)
            print("need text")
            
       
    }


This my note as my problem and solution @luffyselah

import UIKit
import GoogleSignIn


class LoginViewController: UIViewController, GIDSignInUIDelegate, GIDSignInDelegate{ 
func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!) {
        
        if GIDSignIn.sharedInstance().hasAuthInKeychain() {
            // Signed in
            
            let vc = secondViewController()
            self.navigationController?.setViewControllers([vc], animated: true)

            
        } else {
            self.dismiss(animated: true, completion: nil)
            
        }
.....

       override func viewDidLoad() {
        super.viewDidLoad()
        
        GIDSignIn.sharedInstance().uiDelegate = self
        GIDSignIn.sharedInstance().delegate = self
        GIDSignIn.sharedInstance().signInSilently()
        

        TextFiled()
        //if the user is already logged in
        if (FBSDKAccessToken.current()) != nil{
            getFBUserData()
        }

    }

import UIKit
import GoogleSignIn



class LoginViewController: UIViewController, GIDSignInUIDelegate, GIDSignInDelegate{
    
    func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!) {
        
        if GIDSignIn.sharedInstance().hasAuthInKeychain() {
            // Signed in
            
           let vc = secondViewController()
            self.navigationController?.setViewControllers([vc], animated: true)

            
        } else {
            self.dismiss(animated: true, completion: nil)
            
        }
        
       
    }
    
    
    var user = GIDSignIn()
  

    @IBAction func gButton(_ sender: Any) {

        GIDSignIn.sharedInstance().signIn()
        
        
    }
    
    
    
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        GIDSignIn.sharedInstance().uiDelegate = self
        GIDSignIn.sharedInstance().delegate = self
        GIDSignIn.sharedInstance().signInSilently()
        

    }
    


}

<key>CFBundleURLTypes</key>
<array>
  <dict>
  <key>CFBundleURLSchemes</key>
  <array>
    <string>fb(YourAppID)</string>
  </array>
  </dict>
</array>
<key>FacebookAppID</key>
<string>(YourID)</string>
<key>FacebookDisplayName</key>
<string>(YourApp)</string>

import UIKit

import FacebookLogin

import FBSDKLoginKit



class FacebookLoginViewController: UIViewController {

    

    

    @IBAction func bLoginF(_ sender: Any) {

        

        let loginManager = LoginManager()

        loginManager.logIn(readPermissions: [.publicProfile], viewController : self) { loginResult in

            

            switch loginResult {

            case .failed(let error):

                print(error)

            case .cancelled:

                print("User cancelled login.")

            case .success(let grantedPermissions, let declinedPermissions, let accessToken):

                self.getFBUserData()

            }

        }

        

    }



    var dict : [String : AnyObject]!

    

    override func viewDidLoad() {

        super.viewDidLoad()



        

        //if the user is already logged in

        if (FBSDKAccessToken.current()) != nil{

            getFBUserData()

        }

    }

    

        

        //function is fetching the user data

        func getFBUserData() {

            if((FBSDKAccessToken.current()) != nil){

                FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id, name, picture.type(large), email"]).start(completionHandler: { (connection, result, error) -> Void in

                    if (error == nil){

                        self.dict = result as! [String : AnyObject]

                        print(result!)

                        print(self.dict)

                    }

                })

            }

        }

}

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        

        FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)

        

        window = UIWindow(frame: UIScreen.main.bounds)

        window?.makeKeyAndVisible()

        window?.rootViewController = UINavigationController(rootViewController: FacebookLoginViewController())

        

        return true

    }

    func applicationWillResignActive(_ application: UIApplication) {


        FBSDKAppEvents.activateApp()

    }