swift - iOS App Crashes in didFinishLaunchingWithOptions due to IBOutlet -


in ios app have initial viewcontroller 2 textfields login. if run application in debug mode code compiles , can see initial viewcontroller set on main storyboard.

in opposite if try run code in release app crashes calming outlet not set.

2017-04-07 13:55:53.422 sahin fruit[40068:1230157] *** terminating app due uncaught exception 'nsunknownkeyexception', reason: '[<uiviewcontroller 0x7fb5e2e0a450> setvalue:forundefinedkey:]: class not key value coding-compliant key emailtextfield.'

to overcome problem tries set initial vc in appdelegate programatically no result, app still crashes. idea?

    self.window = uiwindow(frame: uiscreen.main.bounds)     let initialviewcontroller = uistoryboard.viewcontrollerwithidentifier(main.loginvc.rawvalue, storyboardname: .main)     self.window?.rootviewcontroller = initialviewcontroller     self.window?.makekeyandvisible()

p.s: turned off optimisation in release see if no result.

this because must have copied viewcontroller in storyboard , assigned different class. right click on top of viewcontroller @ first square box(forgot exact name), , outlet ll shown yellow color triangle, delete it , project build fine.

enter image description here


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