Cannot find protocol declaration for 'UNUserNotificationCenterDelegate' in -Swift.h file

Question

I tried to convert my objective C AppDelegate to Swift AppDelegate. So I deleted the main.m file and Converted all the AppDelegate code to swift. I tried to run the project, then this error occurs.

Cannot find protocol declaration for 'UNUserNotificationCenterDelegate'

In the -Swift.h file they generate, this is the delegate they showed

- (void)userNotificationCenter:(UNUserNotificationCenter * _Nonnull)center willPresentNotification:(UNNotification * _Nonnull)notification withCompletionHandler:(void (^ _Nonnull)(UNNotificationPresentationOptions))completionHandler SWIFT_AVAILABILITY(ios,introduced=10.0);

This is how I have written

@available(iOS 10.0, *)
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
    handleNotification(notification.request.content.userInfo)
}

Please help me get what is the issue am facing.

I tried, cleaning, restarting Xcode and restarting my Mac. Am using Swift 3.2.

This is my -Swift.h file error

If I comment the delegates, there are no errors.

Probable duplicate of https://stackoverflow.com/questions/10160887/cannot-find-protocol-declaration-for It all depends on your Objective C imports. You have not shown them so who knows what you’re doing. Clearly your conversion to Swift is very incomplete, and you have also deleted the main file prematurely. — matt, Mar 22 '18 at 14:12
Just commenting my UserNotifications Delegates will remove the error, and everything will work like charm. So this ain't a duplicate @matt. — Abin George, Mar 23 '18 at 03:54

score 3 · Accepted Answer · answered Mar 23 '18 at 04:18

3

Strange fix but by importing #import in my bridging header the issue was resolved.

answered Mar 23 '18 at 04:18

Abin George

644
6
21

Which is what I said, and what the duplicate said. – matt Mar 23 '18 at 05:16
1

That fixed my problem. – Hassy May 25 '18 at 09:42
1

can u post the import? my code is #import "UserNotifications.h" but got error 'UserNotifications.h' file not found – famfamfam Jan 03 '19 at 08:03

score 0 · Answer 2 · answered Mar 22 '18 at 13:26

0

You need to import following framework: import UserNotifications

answered Mar 22 '18 at 13:26

Narendar Singh Saini

3,555
1
17
17

1

where to import? Tks – famfamfam Jan 03 '19 at 08:06

Karthick Selvaraj · Answer 3 · 2018-03-22T13:55:20.387

This is how you need to proceed

import UIKit 
import UserNotifications

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

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

   /**Register for push notification*/
   func registerForPushNotification() {
       let userNotification = UNUserNotificationCenter.current()
       userNotification.delegate = self
       userNotification.requestAuthorization(options: [.sound, .badge, .alert]) { (status, error) in
        if error == nil {
            DispatchQueue.main.async { // From iOS 10 onwards we need to call pushNotification registration method in main thread.
                UIApplication.shared.registerForRemoteNotifications()
            }
        }
      }
   }

}


// MARK: - UNUserNotificationCenterDelegate methods
extension AppDelegate: UNUserNotificationCenterDelegate {

    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        completionHandler([.sound, .badge, .alert])
    }

}

Thanks.

score 0 · Answer 4 · answered Jul 15 '22 at 06:25

0

Just need to #import required framework in BridgingHeader.h to solve the problem

e.g

#import <UserNotifications/UserNotifications.h>

answered Jul 15 '22 at 06:25

steveSarsawa

1,559
2
14
31

Cannot find protocol declaration for 'UNUserNotificationCenterDelegate' in -Swift.h file

4 Answers4

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