/*
此代理方法只会在app处于前台是执行，如果需要前台显示则有Badge、Sound、Alert三种类型可以设置：
completionHandler(UNNotificationPresentationOptionBadge|UNNotificationPresentationOptionSound|UNNotificationPresentationOptionAlert);
*/
- (void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler

/*
这个代理方法，只有用户点击消息才会触发，用户长按（3DTouch）、Action并不会触发，最后需要执行completionHander();否则会报warning:
*/
- (void)userNotificationCenter:(UNUserNotificationCenter *)center didReceiveNotificationResponse:(UNNotificationResponse *)response withCompletionHandler:(void (^)())completionHandler