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