How to add TextField to UIAlertController in Swift

Question

I am trying to show a UIAlertController with a UITextView. When I add the line:

    //Add text field
    alertController.addTextFie         


        

Answer 1

UIAlertController with UITextfield in latest Apple Swift version 5.1.3

Create a lazy variable of UIAlertController in your UIViewController , Add UITextFieldDelegate , Show Alert on UIButton Action :

class  YourViewController: UIViewController,UITextFieldDelegate {

    //Create Alert Controller Object here
    lazy var alertEmailAddEditView:UIAlertController = {

        let alert = UIAlertController(title:"My App", message: "Customize Add/Edit Email Pop Up", preferredStyle:UIAlertController.Style.alert)

        //ADD TEXT FIELD (YOU CAN ADD MULTIPLE TEXTFILED AS WELL)
        alert.addTextField { (textField : UITextField!) in
            textField.placeholder = "Enter  emails"
            textField.delegate = self
        }

        //SAVE BUTTON
        let save = UIAlertAction(title: "Save", style: UIAlertAction.Style.default, handler: { saveAction -> Void in
            let textField = alert.textFields![0] as UITextField
            print("value entered by user in our textfield is: \(textField.text)")
        })
        //CANCEL BUTTON
        let cancel = UIAlertAction(title: "Cancel", style: UIAlertAction.Style.default, handler: {
            (action : UIAlertAction!) -> Void in })


        alert.addAction(save)
        alert.addAction(cancel)

        return alert
    }()


    //MARK:- UIButton Action for showing Alert Controller
    @objc func buttonClicked(btn:UIButton){
        self.present(alertEmailAddEditView, animated: true, completion: nil)
    }

    //MARK:- UITextFieldDelegate
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true
    }
}

Happy Coding!! :)

Answer 2

private func showLoginAlert() {
    let loginAlert = UIAlertController(title: "Login Using Credentials", message: nil, preferredStyle: .alert)
    loginAlert.view.tintColor = .systemBlue

    loginAlert.addTextField { usernameField in
        usernameField.font = .systemFont(ofSize: 17.0)
        usernameField.placeholder = "Username"
    }
    loginAlert.addTextField { passwordField in
        passwordField.font = .systemFont(ofSize: 17.0)
        passwordField.isSecureTextEntry = true
        passwordField.placeholder = "Password"
    }

    let cancelAction = UIAlertAction(title: "Cancel",
                                     style: .destructive,
                                     handler: { _ in
                                        // self.handleUsernamePasswordCanceled(loginAlert: loginAlert)
    })
    loginAlert.addAction(cancelAction)

    let loginAction = UIAlertAction(title: "Login",
                                    style: .default,
                                    handler: { _ in
                                        // self.handleUsernamePasswordEntered(loginAlert: loginAlert)
    })
    loginAlert.addAction(loginAction)
    loginAlert.preferredAction = loginAction
    present(loginAlert, animated: true, completion: nil)
}

Swift 5

Answer 3

Solution:

Swift 4.2

Try the following lines and see if it works:

let alertController = UIAlertController(title: "Add New Name", message: "", preferredStyle: .alert)

alertController.addTextField { (textField : UITextField!) -> Void in
    textField.placeholder = "Enter Second Name"
}

let saveAction = UIAlertAction(title: "Save", style: .default, handler: { alert -> Void in
    let firstTextField = alertController.textFields![0] as UITextField
    let secondTextField = alertController.textFields![1] as UITextField
})

let cancelAction = UIAlertAction(title: "Cancel", style: .default, handler: nil )

alertController.addTextField { (textField : UITextField!) -> Void in
    textField.placeholder = "Enter First Name"
}

alertController.addAction(saveAction)
alertController.addAction(cancelAction)

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

Hope it helps.

Answer 4

For Swift 4.0, You can use this sample of code succesfully tested in my project:

@IBAction func withdrawTapped(_ sender: UIButton) {

  let alertController = UIAlertController(title: "Token withdraw", message: "", preferredStyle: .alert)

  let withdrawAction = UIAlertAction(title: "Withdraw", style: .default) { (aciton) in

    let text = alertController.textFields!.first!.text!

    if !text.isEmpty {
      self.presentAlert(
        title: "Succesful", 
        message: "You made request for withdraw \(textField.text) tokens")
    }
  }

  let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { (action) in
  }

  alertController.addTextField { (textField) in
    textField.placeholder = "999"
    textField.keyboardType = .decimalPad
  }

  alertController.addAction(withdrawAction)
  alertController.addAction(cancelAction)

  self.present(alertController, animated: true, completion: nil)
}

Answer 5

So I started checking to see what could possibly have been different in my code to the working code. I noticed that my ViewController extends

UITextFieldDelegate

Which apparently means that I need to set the delegate of any child UITextView:

alertController.addTextFieldWithConfigurationHandler { (textField) -> Void in
    searchTextField = textField
    searchTextField?.delegate = self //REQUIRED
    searchTextField?.placeholder = "Enter your search terms"
}

Answer 6

In Swift 4.2 and Xcode 10.1

Alert with two Textfields and Read TextField text data and present alert on top of all views.

func alertWithTF(title: String, message: String) {
    //Step : 1
    let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.alert)

    //Step : 2
    alert.addAction (UIAlertAction(title: "Save", style: .default) { (alertAction) in
        let textField = alert.textFields![0]
        let textField2 = alert.textFields![1]
        if textField.text != "" {
            //Read textfield data
            print(textField.text!)
            print("TF 1 : \(textField.text!)")
        } else {
            print("TF 1 is Empty...")
        }
        if textField2.text != "" {
            //Read textfield data
            print(textField2.text!)
            print("TF 2 : \(textField2.text!)")
        } else {
            print("TF 2 is Empty...")
        }
    })

    //Step : 3
    //For first TF
    alert.addTextField { (textField) in
        textField.placeholder = "Enter your first name"
        textField.textColor = .red
    }
    //For second TF
    alert.addTextField { (textField) in
        textField.placeholder = "Enter your last name"
        textField.textColor = .blue
    }

    //Cancel action
    alert.addAction(UIAlertAction(title: "Cancel", style: .default) { (alertAction) in })
   self.present(alert, animated:true, completion: nil)

}

If you want to present aleert on top of all views.

Here from above code remove this last line self.present(alert, animated:true, completion: nil) and add below code.

//Present alert on top of all views.
let alertWindow = UIWindow(frame: UIScreen.main.bounds)
alertWindow.rootViewController = UIViewController()
alertWindow.windowLevel = UIWindowLevelAlert + 1

alertWindow.makeKeyAndVisible()

alertWindow.rootViewController?.present(alert, animated:true, completion: nil)

Now call like this

alertWithTF(title: "This is title", message: "This is message")