MBProgressHUD wont show - objective-c

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!

Answer 2

Are u fetching anything from the server ?
If so please check whether u are passing synchronous request or asynchronous . Asynchronous requests are the best to follow .
Handle MBProgressBar in this way .
[MBProgressHUD showHUDAddedTo:self.view animated:YES];
dispatch_async(dispatch_get_main_queue(), ^{
//Any UI updates should be made here .
[MBProgressHUD hideHUDForView:self.view animated:YES];
});