CODEWITHSUNDEEP
iosiphoneswift
Faisal Khalid
Faisal Khalid

Reputation: 650

Cannot update textfield in delegate callback method

I have implemented delegate in LoginViewController defined in RegistrationViewController. Callback function is calling but the problem is that I am not able to update the textfield of LoginViewController in delegate method.

LoginViewController.swift

import UIKit

class LoginViewController :UIViewController,RegisterViewDelegate {

    @IBOutlet weak var mobileNumber: UITextField!

    @IBAction func showRegistrationView(_ sender: Any) {

     let controller = storyboard?.instantiateViewController(withIdentifier: "registration") as! RegistrationViewController
       controller.delegate = self
     present(controller, animated: false, completion: nil)
    }

    func onUserRegistrationCompletion(number: String) {
            print(number) // output is 05010101010
        DispatchQueue.main.async {
            self.mobileNumber.text! = number
            print(self.mobileNumber.text!) . // output is empty
        }

    }



}

RegistrationViewController.swift

import UIKit

    class RegistrationViewController: UIViewController {

        weak var delegate:RegisterViewDelegate?

        @IBAction func register(_ sender: Any) {
            self.delegate?.onUserRegistrationCompletion(number: "05010101010")
            let controller = self.storyboard?.instantiateViewController(withIdentifier: "login")
            present(controller!, animated: false, completion: nil)
        }

    }


    protocol RegisterViewDelegate:class {
        func onUserRegistrationCompletion(number:String)
    }

Upvotes: 0

Views: 75

Answers (2)

Dharmesh Kheni
Dharmesh Kheni

Reputation: 71854

I suggest you to use navigationController.

and you can push to next view this way:

let controller = storyboard?.instantiateViewController(withIdentifier: "registration") as! RegistrationViewController
controller.delegate = self
self.navigationController?.pushViewController(controller, animated: true)

and when you want to go back to previous view use this code:

self.delegate?.onUserRegistrationCompletion(number: "05010101010")
self.navigationController?.popViewController(animated: true)

And your result will be:

enter image description here

Check THIS sample for more info.

And don't forget to Embed In your LoginViewController into navigationController from storyboard. as shown in demo project.

Upvotes: 1

Anbu.Karthik
Anbu.Karthik

Reputation: 82759

it means you allocating the memory again on self.storyboard?.instantiateViewController(withIdentifier: "login") in Register VC, that the reason your delegate is by default goes to nil.

@IBAction func register(_ sender: Any) {
        self.delegate?.onUserRegistrationCompletion(number: "05010101010")
         self.dismiss(animated: true, completion:nil) 
    }

Upvotes: 1

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