Objective-C Delegate in Swift

Register Objective-C notification protocal in Swift Project.

If you want achieve objective-c delegate in to swift. You need to do following steps.

1. Need to create bridge file to import your objective-c classes

    //
    //  Use this file to import your target's public headers that you would like to expose to Swift.
    //
   
    #import "UVIViewController.h"
   

2. You need to extend the protocol name in your swift viewcontroller

    import UIKit
   
    class ViewController: UVIViewController, UVIDataRefreshProtocol {   // 2. Extend Protocal
        
        var secondController: DelegateViewController?
   
        @IBOutlet var delegateRefresh: UILabel!
        
        override func viewDidLoad() {
            super.viewDidLoad()
            // Do any additional setup after loading the view, typically from a nib.
   
            self.registerForBasicDataRefreshNotification();             //  3. Register the protocol notification
        }
   
        override func didReceiveMemoryWarning() {
            super.didReceiveMemoryWarning()
            // Dispose of any resources that can be recreated.
        }
        
        // Register the protocol notification with same name. Example : DataRefreshNotification
        override func registerForBasicDataRefreshNotification() {
        
            self.validateBasicDataRefreshNotification();
            NSNotificationCenter.defaultCenter().addObserver(        // 4. Register the protocol notification with same name.
                self,
                selector: "basicDataDidRefresh",
                name: DataRefreshNotification,
                object: nil)
        
        }
        
        override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
            delegateRefresh.text = "";
            if segue.identifier == "view_to_delegate" {
                secondController = segue.destinationViewController as? DelegateViewController
            }
        }
        
        // Basic Data Did Refresh Notification
        func basicDataDidRefresh() {                            //  4. Event will be triggered while calling the protocol post notification. called with same name
                NSLog("\n Basic data is refreshed")
                delegateRefresh.text = "Basic data is refreshed";
        }
   
    }
   

---

    5. NSNotificationCenter.defaultCenter().postNotificationName(DataRefreshNotification, object: nil)  // Call the notification.

Do you like it?

Do you like this repo? Share it on Twitter, Facebook, Google+ or anywhere you like so that more of us can use it and help. Thanks!

Created by Vignesh