Question

i am playing around with MBProgressHUD. the worflow in the viewcontroller (tableview) goes like that:

1) IBAction gets called to switch between 2 different tables
2.1) function reloadAllMonth gets called (initializes an array with the data for the new table)
2.2) MBProgressHUD *HUD should be displayed
3) reloadAllMonth is finished
4) HUD should disappear

my current code:

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{

        //sparing you the code that determins where the tap occured

        HUD = [[MBProgressHUD alloc]initWithFrame:self.view.frame];
        [MBProgressHUD showHUDAddedTo:self.view animated:YES];
        [self reloadAllMonth];
        allMonthIsActive = YES;
        [MBProgressHUD hideHUDForView:self.view animated:YES];

// some other code table reload etc.
}

what happens:

-> function touchesbegan gets called
-> nothing happens for 3-4 seconds (loading time)
-> new table pops up

question: why does the HUD not show up? where did i go wrong ?

Answer 1

You can’t have both show and hide in the same thread, this is what I would do:

-(void)reloadStuff
{
    [self reloadAllMonth];
    allMonthIsActive = YES;
    [MBProgressHUD hideHUDForView:self.view animated:YES];
    isLoading = NO;
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    //sparing you the code that determins where the tap occured

    if (isLoading)
        return;
    isLoading = YES;
    [MBProgressHUD showHUDAddedTo:self.view animated:YES];
    [self performSelectorInBackground:@selector(doStuff) withObject:nil];
}

Also you can remove the ivar HUD, you are not using it.

And don’t forget to initialize isLoading in viewDidLoad to NO:

isLoading = NO;

Good luck!