iOS10 推送最新特性研究

 delegate

<UNUserNotificationCenterDelegate> 

iOS10收到通知不再是在application: didReceiveRemoteNotification:方法去处理， iOS10推出新的代理方法，接收和处理各类通知（本地或者远程）

 - (void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler {
  //应用在前台收到通知
  NSLog(@"========%@", notification);
}

- (void)userNotificationCenter:(UNUserNotificationCenter *)center didReceiveNotificationResponse:(UNNotificationResponse *)response withCompletionHandler:(void (^)())completionHandler {
  //点击通知进入应用
  NSLog(@"response:%@", response);
}