In my app, I am loading a resource heavy view that takes about 1 to 2 seconds to load. So I am loading it in a separate thread like this:
hud = [[MBProgressHUD alloc] init];
[hud showWhileExecuting:@selector(loadWorkbench:) onTarget:self withObject:nil animated:YES];
however it never appears, and application looks frozen to the end user. any ideas where I have gone wrong?
Yes. It does not appear because you never tell add the HUD as a subview of the window. try something like:
// Should be initialized with the windows frame so the HUD disables all user input by covering the entire screen HUD = [[MBProgressHUD alloc] initWithWindow:[UIApplication sharedApplication].keyWindow]; // Add HUD to screen [self.view.window addSubview:HUD]; // Register for HUD callbacks so we can remove it from the window at the right time HUD.delegate = self; HUD.labelText = NSLocalizedString(@"Loading Workbench", nil); HUD.detailsLabelText = NSLocalizedString(@"please wait", nil); // Show the HUD while the provided method executes in a new thread [HUD showWhileExecuting:@selector(loadWorkbench:) onTarget:self withObject:nil animated:YES];
Since you are setting yourself as the HUD delegate, also add the following delegate method:
- (void)hudWasHidden { // Remove HUD from screen [HUD removeFromSuperview]; // add here the code you may need }
and remember to add MBProgressHUDDelegate in the corresponding header file.
原文：http://www.cnblogs.com/ghgyj/p/4056119.html