I am building with the release version of Xcode 7.0. No storyboards, just nib files.
I have a single UINavigationController
created by the app delegate
I had the same issue with my UIViewController
where i was only declaring variable in my class let alert = UIAlertView()
without using it yet, it was out of all the functions just inside the class as variable. by removing that solves the issue. so please check in your class if you have defined alert from UIAlertView
or UIAlertViewController
like that without using it or in the class variable!