Unknown class _TtC18ViewController in Interface Builder file

Question

Created Sep ’20

Replies 7

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I am getting Unknown class _TtC18ViewController in Interface Builder file for one of my ViewController for iOS 12.2 simulator.
I have tried to change class name, module and storyboardID, but having same error.

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Answer 1

mtricht OP

Sep ’20

I'm seeing the same issue in my simulator since upgrading to Xcode 12. Getting this error for iOS 10, 11 and 12. Works fine for iOS 13 and 14.

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Answer 2

Claude31 OP

Sep ’20

Did you reset the class name in IB and do an option - clean Build folder ?

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Answer 3

tagrawalla OP

Sep ’20

I did reset the class name in IB and did clean build folder. But I am still getting this issue. I am using Xcode 11.5. why is this happening only for specific ViewControllers?

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Answer 4

Claude31 OP

Sep ’20

Is it iOS 12.2 simulator. On Xcode 11.5 ?

Did you try to remove completely the VC and recreate it ?

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Answer 5

Dave Goldman PDX OP

Oct ’20

Same issue here, running on device (iPhone X), iOS 12.3.1. Xcode 12.0.1.

Same issue on simulator iPhone X, iOS 12.2.

Works fine for my iOS 13 iPad.

Was not an issue for Xcode 10 or 11, with the same project.

1

Answer 6

Dave Goldman PDX OP

Oct ’20

Ah. In my case this was caused by a reappearance of this previously-noted bug:

https://forums.developer.apple.com/message/398162#398162

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Answer 7

ergunkocak OP

Nov ’20

@mtricht did you find a solution?

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