wait_fences: failed to receive reply: 10004003 error - UIAlert WITHOUT UITextField present

Question

I am working on an app where a UIAlert pops up the first time the user begins using it to ask if they want to use their current location. This happens within the main contro

Answer 1

The reason for this wait_fences: failed to receive reply: can also be that you try to show an alert while not being on the mainThread (which is the GUI thread).

Dispatching to the GUI thread helps:

dispatch_async(dispatch_get_main_queue(), ^{ 
  [mainAlert show];
});