Question

I trying to fix a strange bugg. People with IOS 4 can’t even start my app after the update before it crashes. IOS 5 devices works great.

The things that comes to mind that I added in the last update is blocks. But block should work on ios4, right?

IOS 4.3 simulator works great, but a 4.2.1 3GS crashes on the dispatch_async code below.

I know there isn’t much info here, but any suggestion would be appriciated.

Thanks in advance

1.         
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND,0), ^(void) 
                       {
                           dispatch_async(dispatch_get_main_queue(), ^(void) 
                                          {


2. 
    [UIView animateWithDuration:0.25f animations:^
     {
         myView.alpha = 0; 
     }]; 

Answer 1

See my answer to this question. The problem is DISPATCH_QUEUE_PRIORITY_BACKGROUND.