Anomalous bar on UIViewController in Storyboard. What is it?

https://stackoverflow.com/questions/21717067

ios
xcode-storyboard

10-10-2022
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سؤال

I don't know where this bar (indicated by red arrow) came from. It's not listed in the Document Outline, and I can't get rid of it. Tried quitting and restarting Xcode, and it's still there. Anybody got a guess?

enter image description here

Thanks!

المحلول

That is because it is a UITabBarController with no attached view controllers.

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