MBprogressHUD not showing as expected - ios

Question

I am using MBProgressHUD to show a HUD but it is not showing as expected.
Steps:
User selects a cell in a tableView. Some data is parsed then a warning (UIAlertView) is shown to the user. The user is asked if they want to create a New Game with the selected (cell) user. Cancel/Start Game buttons.
The UIAlertView delegate methods is as follows:
pragma mark - UIAlertView Delegate
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
NSLog(#"button %i",buttonIndex);
if (buttonIndex == 0) {
// Cancel button pressed
self.gameNewOpponentuser = nil;
} else {
// Start Game button pressed
[MESGameModel createNewGameWithUser:[PFUser currentUser] against:self.gameNewOpponentuser];
}
}
If the user selects Start Game the GameModel method is run. The game model(NSObject subclass) method is as follows:
pragma mark - Custom method
+(void)createNewGameWithUser:(PFUser *)user1 against:(PFUser *)user2 {
// First we put a HUD up for the user on the window
MBProgressHUD *HUD = [[MBProgressHUD alloc] initWithWindow:[UIApplication sharedApplication].keyWindow];
HUD.dimBackground = YES;
HUD.labelText = NSLocalizedString(#"HUDCreateNewGame", #"HUD - Create New Game text");
HUD.removeFromSuperViewOnHide = YES;
// Confirm we have two users to play with.
}
As you can see the HUD is alloc init to the keywindow of the application. However, the HUD is not showing as expected, nothing happens no UI lockup etc. I have put a breakpoint in the above method and can see that it is called however the HUD is not displayed
From the above, I expect the HUD to show up but nothing else happen, i.e. the HUD just remain on screen at the moment...

Answer 1

You are missing the part where you add the HUD to the Window and then showing the HUD. Note that you can add the HUD to the Window or the current view (self.view).
MBProgressHUD *HUD = [[MBProgressHUD alloc] initWithWindow:[UIApplication sharedApplication].keyWindow];
[[UIApplication sharedApplication].keyWindow addSubview:HUD]; //<-- You're missing this
HUD.dimBackground = YES;
HUD.labelText = NSLocalizedString(#"HUDCreateNewGame", #"HUD - Create New Game text");
HUD.removeFromSuperViewOnHide = YES;
[HUD showAnimated:YES whileExecutingBlock:^{ //<-- And this
// Do something
}];

Answer 2

Try this:
MBProgressHUD *HUD = [[MBProgressHUD alloc] initWithView:self.view];
HUD.labelText = NSLocalizedString(#"HUDCreateNewGame", #"HUD - Create New Game text");
// Set determinate mode
[HUD setMode:MBProgressHUDModeDeterminate];
[self.view addSubview:HUD];
[HUD show:YES];

Answer 3

You aren't adding it to any view for it to be displayed. So add it to appropriate view.
From the git hub project demo for MBProgressHUD
// The hud will dispable all input on the view (use the higest view possible in the view hierarchy)
HUD = [[MBProgressHUD alloc] initWithView:self.navigationController.view];
[self.navigationController.view addSubview:HUD];

Answer 4

You are not given the code to display the hud. use the following code
MBProgressHUD *HUD = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
HUD.dimBackground = YES;
HUD.labelText = NSLocalizedString(#"HUDCreateNewGame", #"HUD - Create New Game text");

Answer 5

Ok, I found the issue. I was using clickedButtonAtIndex method for the UIAlertView which was of course holding to the view. I used didDismissWithButtonIndex instead and this works fine now.