title: How to implement push notification for iOS 10[Objective C]?
body: <p>Can anyone help me with implementing push notification for iOS 10 as i have implemented following code but still getting problem in it:</p>
  
  <pre><code>#define SYSTEM_VERSION_GRATERTHAN_OR_EQUALTO(v)  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
  
  if(SYSTEM_VERSION_GRATERTHAN_OR_EQUALTO(@"10.0"))
  {
      UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
      center.delegate = self;
      [center requestAuthorizationWithOptions:(UNAuthorizationOptionSound | UNAuthorizationOptionAlert | UNAuthorizationOptionBadge) completionHandler:^(BOOL granted, NSError * _Nullable error){
          if(!error){
              [[UIApplication sharedApplication] registerForRemoteNotifications];
          }
      }];
  }
  else {
      // Code for old versions
  }
  </code></pre>
  
  <p>I am getting error suggesting that </p>
  
  <blockquote>
    <p>Unknown receiver UIUserNotificationCenter</p>
  </blockquote>
  
  <p>Thank you in advance!</p>