Is it possible to have UISearchBarDelegate extension in separate file?

Question

extension HomeViewController: UISearchBarDelegate {


    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
        //code
    }

    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
         //code     
    }
}

This was working fine when it was at the bottom of my HomeViewController.
I wonder if I can separate this extension in separate file?

Ofc I did, but I got this error : >Use of undeclared type 'UISearchBarDelegate' — faris97, Jan 31 '20 at 08:42
@faris97 check to see if you've imported UIKit at the top of your new file — Alan S, Jan 31 '20 at 08:43
Including the error in your question would be a good idea in future. — Magnas, Jan 31 '20 at 08:44

score 2 · Answer 1 · answered Jan 31 '20 at 10:05

Yes it is possible.

Hope you know about extention in swift.

Extensions is useful feature that helps in adding more functionality to an existing Class, Structure, Enumeration or a Protocol type. This includes adding functionalities for types where you don’t have the original source code.

Code:

class HomeVC: UIViewController {

    var searchBar = UISearchBar()

    override func viewDidLoad() {
        super.viewDidLoad()
        self.searchBar.delegate = self   
    }
}

create another file named HomeVC+SearchBarDelegate

import Foundation
import UIKit

extension HomeVC: UISearchBarDelegate {

    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
        //code
    }

    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
         //code
    }
}

I hope this will help you.

Thank you

score 0 · Accepted Answer · answered Jan 31 '20 at 08:48

0

I forgot to include UIKit.

import Foundation
import UIKit

extension HomeViewController {
    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String)        {
      //code
    }

    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
     //code
    } 
}

Also, you need to inherit UISearchBarDelegate in ViewController, not in extension.

answered Jan 31 '20 at 08:48

faris97

402
4
24

That isn’t true. – Magnas Feb 11 '20 at 20:33

score 0 · Answer 3 · answered Jan 31 '20 at 09:00

You can achieve this like below.

viewDidLoad(){
  let searchBar = UISearchBar()
  searchBar.delegate = DelegateFile()
}

create a file.

class DelegateFile: NSObject, UISearchBarDelegate{
    func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {
        //
    }
}

Then implement your delegate methods in the seperate file.

Is it possible to have UISearchBarDelegate extension in separate file?

3 Answers3