Apple Watch handling Notification actions

First of all, we need to create categories

    UIMutableUserNotificationAction *acceptAction = [[UIMutableUserNotificationAction alloc] init];

    acceptAction.identifier = @"ACCEPT_IDENTIFIER";

    acceptAction.title = @"Accept";

    acceptAction.activationMode = UIUserNotificationActivationModeBackground;

    acceptAction.destructive = NO;

    acceptAction.authenticationRequired = NO;

    

    UIMutableUserNotificationAction *rejectAction = [[UIMutableUserNotificationAction alloc] init];

    rejectAction.identifier = @"REJECT_IDENTIFIER";

    rejectAction.title = @"Reject";

    rejectAction.activationMode = UIUserNotificationActivationModeBackground;

    rejectAction.destructive = NO;

    rejectAction.authenticationRequired = NO;

    

    UIMutableUserNotificationCategory *notificationCategory = [[UIMutableUserNotificationCategory alloc] init];

    notificationCategory.identifier = @"CALL_NOTIFICATION_CATEGORY";

    [notificationCategory setActions:@[acceptAction,rejectAction]forContext:UIUserNotificationActionContextDefault];

    

    NSSet *categories = [NSSet setWithObjects:notificationCategory, nil];

    UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeBadge|UIUserNotificationTypeSound categories:categories];

    

    [[UIApplication sharedApplication] registerUserNotificationSettings:settings];

Now on the App Delegate of the companion app, can override the method

- (void)application:(UIApplication *) application handleActionWithIdentifier: (NSString *) identifier forLocalNotification: (NSDictionary *) notification completionHandler: (void (^)()) completionHandler {

if ([identifier isEqualToString: @"ACCEPT_IDENTIFIER"])

        {

            NSLog(@"Accept is pressed");

            OngoingCallScreen *callScreen = [OngoingCallScreen sharedScreen];

            NSArray *callSessions = [callScreen getActiveCalls];

            NSLog(@"Call Sessions Are :%@",callSessions);

            if([callSessions count] > 0)

            {

                [callScreen handleCallEvent:CallEventToAnswerIncomingCall with:[callSessions objectAtIndex:0]];

            }

            

        }

        else

        {

            NSLog(@"Reject is pressed");

            OngoingCallScreen *callScreen = [OngoingCallScreen sharedScreen];

            NSArray *callSessions = [callScreen getActiveCalls];

            NSLog(@"Call Sessions Are :%@",callSessions);

            if([callSessions count] > 0)

            {

                [callScreen handleCallEvent:CallEventToRejectIncomingCall with:[callSessions objectAtIndex:0]];

            }

        }

   completionHandler();

}

references:
https://developer.apple.com/library/ios/documentation/General/Conceptual/WatchKitProgrammingGuide/BasicSupport.html#//apple_ref/doc/uid/TP40014969-CH18-SW1