Getting a “This application is modifying the autolayout engine from a background thread” error?

Question

Been encountering this error a lot in my OS X using swift:

\"This application is modifying the autolayout engine from a background thread, which can

Answer 1

I had this problem since updating to the iOS 9 SDK when I was calling a block that did UI updates within an NSURLConnection async request completion handler. Putting the block call in a dispatch_async using dispatch_main_queue solved the issue.

It worked fine in iOS 8.