Question

Here is my code:

#ifdef DEBUG
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"ERROR" message:@"JSON Parsing Error" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alertView show];
    [alertView release];
#endif

This code is executed in a background thread (responsible for parsing), and the error only happens every other time. Any idea on what is the problem here?

Answer 1

Dont mess with the UI from the background thread. Create a method and call that method on the main thread:

[someObject performSelectorOnMainThread:@selector(showDebug:)
                             withObject:@"JSON Parsing Error"
                          waitUntilDone:YES];