iOS Question Retrieve Firebase Dynamic Links

@end  
@interface b4i_main (notification) <UNUserNotificationCenterDelegate>
@end
@implementation b4i_main (notification)
- (void)userNotificationCenter:(UNUserNotificationCenter *)center
       willPresentNotification:(UNNotification *)notification
         withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler {
        completionHandler(UNNotificationPresentationOptionAlert | UNNotificationPresentationOptionSound );
   }
@end
@interface b4i_main (fbdl) <UIApplicationDelegate>
@end
@implementation B4IAppDelegate(DL)
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {      
    [FIRApp configure];  
    return YES;
}

- (BOOL)application:(UIApplication *)application continueUserActivity:(nonnull NSUserActivity *)userActivity
    restorationHandler:(nonnull void (^)(NSArray<id<UIUserActivityRestoring>> * _Nullable))restorationHandler {
        if ([userActivity webpageURL] != nil) {          
            NSString *incomingURL = [userActivity webpageURL].absoluteString;
            NSLog(@"Incoming URL is %@", incomingURL);                  
            return YES;          
        }else{          
            return NO;
        }
       
   }
@end