很久没搞一个老项目，搞完后，用户反馈角标不行了，发现是接入极光也得加这行代码，要不然没有通知。。。没通知就没角标，然后要开启background mode的远程推送，就又有角标了

• (void)registerPushNotification {
  UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
  [center requestAuthorizationWithOptions:(UNAuthorizationOptionBadge | UNAuthorizationOptionSound | UNAuthorizationOptionAlert) completionHandler:^(BOOL granted, NSError * _Nullable error) {

    if (!granted) {
  
    }
  

  }];

}