Question

I’m making an app that as a UITableView that gets content from the web, parses it and shows it. It takes a little time to get it and parse it, so I use a loading indicator (MBProgressHUD) and do the loading in background. I wanted to add a button at the footer of the TableView, so I made up this code:

UIButton *myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[myButton addTarget:self action:@selector(myAction)
   forControlEvents:UIControlEventTouchDown];
[myButton setTitle:@"Button Title" forState:UIControlStateNormal];
myButton.frame = CGRectMake(0, 0, 160.0, 40.0);
self.tableView.tableFooterView=myButton;

The proble is that it is initialized in the tableview during the ViewDidLoad() just after my background content loading code

MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
    hud.mode = MBProgressHUDModeIndeterminate;
    hud.labelText = @"Loading";
    dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
        // Do something...
        [self getContent];
        [self.tableView reloadData];
        dispatch_async(dispatch_get_main_queue(), ^{
            [MBProgressHUD hideHUDForView:self.view animated:YES];
        });
    }); 

So when the view loads, the button is set on top (since the tableview is empty) and when it reloads, the button stays on top, I need to go to another view and come back to have the button in the footer.

Is there a way to set the button after the content loading ? Like a -(void)tableViewDidReloadData function ?

Thanks !

Answer 1

Yes, if you do it in the same call as [self.tableView reloadData] (which is a synchronous call) it’ll display once the data is loaded.

MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
hud.mode = MBProgressHUDModeIndeterminate;
hud.labelText = @"Loading";
dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
    // Do something...
    [self getContent];
    dispatch_async(dispatch_get_main_queue(), ^{
        [MBProgressHUD hideHUDForView:self.view animated:YES];
        [self.tableView reloadData];
        UIButton *myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        [myButton addTarget:self action:@selector(myAction) forControlEvents:UIControlEventTouchDown];
        [myButton setTitle:@"Button Title" forState:UIControlStateNormal];
        [myButton setFrame:CGRectMake(0, 0, 160.0, 40.0)];
        [self.tableView setTableFooterView:myButton];
    });
});