I faced a problem after updating to XCode9.0 i wasn't able to connect an outlet of a navigation Item Button to the "exit icon" on the storyboard scene to perform later on an unwind segue. i'm not sure if the bug was in the UINavigationItem or in the exit icon but the way it worked for me eventually was by copy-paste the scene then deleting the origin and after clean build folder (that's where you go on the product menu and hold the option key) it worked just fine.
2 Answers
if this problem happens with you :
first : make sure that you created the unwind prepare for segue method in your code before ctrl-dragging the UIButton to the "exit icon" on the storyboard Scene.
second :if you're still having a problem with ctrl-dragging just rename the unwind prepare for segue method and it should work
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