Multi-Threading Synchronous thread crashing

[Stryker908]

Hi All I have an issue here that I'm hoping somebody can help out with... I have an app with a search button, when a user performs a search I want to resign the keyboard and display a "searching graphic" but for some reason the way I am doing it is apparently not thread safe. Is there something I'm missing here ?

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar{
    
   dispatch_queue_t coreDataThread = dispatch_queue_create("com.me.coreDataThread", DISPATCH_QUEUE_SERIAL);
    dispatch_sync(coreDataThread, ^{
        
        self.activityIndicatorView = [self loadingView];
        self.activityIndicatorView.center = CGPointMake(self.view.frame.size.width /2, self.view.frame.size.height /2);
        
        dispatch_async(dispatch_get_main_queue(), ^{
        
        [self.view addSubview:self.activityIndicatorView];
        [self.view addSubview:activityIndicatorView]; 
        [self.searchBar resignFirstResponder];
        
        });
                       
    });

    
    //---------------------\\
    
    dispatch_sync(coreDataThread, ^{
        
        [self getNewDataAfterFirstResponderResigned];
        [self removeActivityIndicator];
        
    });
    
    dispatch_release(coreDataThread);
}

I am dispatching the threads synchronously because I want to create and display the spinner, as well as remove the keyboard first, then Execute the db search.....

Thanks for the time

[smithdale87]

Care to post the error messages &stack trace from the console?

[RLScott]

It looks like you are accessing the user interface from within a thread that is not the main UI thread. That will always cause problems.