极光iOS集成--下面那段代码有什么用

#if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_7_1
- (void)application:(UIApplication *)application
    didRegisterUserNotificationSettings:
        (UIUserNotificationSettings *)notificationSettings {
}

// Called when your app has been activated by the user selecting an action from
// a local notification.
// A nil action identifier indicates the default action.
// You should call the completion handler as soon as you've finished handling
// the action.
- (void)application:(UIApplication *)application
    handleActionWithIdentifier:(NSString *)identifier
          forLocalNotification:(UILocalNotification *)notification
             completionHandler:(void (^)())completionHandler {

}

// Called when your app has been activated by the user selecting an action from
// a remote notification.
// A nil action identifier indicates the default action.
// You should call the completion handler as soon as you've finished handling
// the action.
- (void)application:(UIApplication *)application
    handleActionWithIdentifier:(NSString *)identifier
         forRemoteNotification:(NSDictionary *)userInfo
             completionHandler:(void (^)())completionHandler {
  }


#endif