Error when dismissing view controller

Question

Getting an error when dismissing a view controller, not seen anything like it before, and not much about it on the internet.

heres the error: * Assertion failur

Answer 1

I recieved this error when I was calling -presentViewController:animated:completion: on a thread that was not the main thread (from a callback in a network request). The solution is to dispatch your calls to present and dismiss view controllers to the main thread:

dispatch_async(dispatch_get_main_queue(), ^{
    //Code that presents or dismisses a view controller here
});