ios - GCD 和 progressHUD

Question

使用任何形式的 progressHUD(SV、MB 等)我遇到了这个问题，即 HUD 在显示后立即隐藏或永久保留在那里。在下面的示例中，HUD 将永久保留，无论推特提要(或其他 View Controller 的页面)是否已完成加载。如何在单独线程中的任务完成后让 HUD 消失？

[MBProgressHUD showHUDAddedTo:self.view animated:YES];
dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{

       //Sets the auth key (user or app) for the RMACC Twitter Feed
       STTwitterAPI *twitter = [STTwitterAPI twitterAPIOSWithFirstAccount];

       [twitter verifyCredentialsWithSuccessBlock:^(NSString *username) {

           [twitter getUserTimelineWithScreenName:@"RMACCNewsNotes" count:10 successBlock:^(NSArray *statuses) {

               dispatch_async(dispatch_get_main_queue(), ^{
                   [MBProgressHUD hideHUDForView:self.view animated:YES];
               });

               self.twitterFeed =[NSMutableArray arrayWithArray:statuses];

               [self.tableView reloadData];

            } errorBlock:^(NSError *error){ }];

        } errorBlock:^(NSError *error) {
            [self twitterselfauthrequest];
        }];

    });        
}

Answer 1

应该是这样的:

[MBProgressHUD showHUDAddedTo:self.view animated:YES];
dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{

// do all your twitter stuff, including the error checking

      dispatch_async(dispatch_get_main_queue(), ^{
         [self.tableView reloadData];
         [MBProgressHUD hideHUDForView:self.view animated:YES];
      });
});