升级到 Xcode 12 后的故事板错误

Question

Since I switched to Xcode 12 I have problems with my storyboard. When I open the storyboard file if shows the following error:

The document “Main.storyboard” had 97 issues that were found and repaired. This may be due to an SCM operation such as merging. Please save the document to fix the issues.

I opened the file as source code and found indeed a lot of duplicates inside the <resources> tag. Those duplicates look like this:

<systemColor name="darkTextColor">
<color white="0.0" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/> 
</systemColor>

I started removing those duplicates, so that only one entry is left. Then I opened the file again in Interface Builder. Now I does not show the error mentioned above but it still says: " An internal error occurred. Editing functionality may be limited. "

Now if I close the file and open it again, Xcode is automatically adding the duplicates mentioned above again and the error " The document “Main.storyboard” had 97 issues that were found and repaired. " is displayed again.

This procedure repeats again and again if I continue removing the duplicates...

UPDATE

I reached out to Apple Developer Technical Support and got the advice to replace all occurrences of groupTableViewBackgroundColor with systemGroupedBackgroundColor .

I have done this and now the error mentioned above does not show up anymore but editing functionalities is still limited in my storyboard and I see those blue boxes around my view controllers. I hope a future Xcode version will fix this.

Answer 1

I faced the same issue regarding the "An internal error occurred. Editing functionality may be limited." message in Xcode and found that it was related to the UISplitViewController im my storyboard. If your storyboard uses a UISplitViewController , select it in Xcode and verify the value of the "Style" property in the Attributes Inspector. For me it was set to "Unspecified (Discouraged)". After I changed it to "Double Column", saved the storyboard, closed the storyboard (you may just want to close the whole Xcode project) and opened the storyboard/project again, everything worked fine.

(And thanks for your update regarding replacing groupTableViewBackgroundColor with systemGroupedBackgroundColor – I had to do this too.)

Answer 2

I found the same problem. Probably is an Xcode issue, it will be resolved in the next version. Anyway, it is annoying, but it hasn't any effect.

Update: it seems that the problem only affects two kind of attributes: darkTextColor and GroupTableColour (Secondary, Tertiary...). Changing them with other attributes (like "Default label colour") solves the problem. Wierd!

EDITED: Solved with Xcode 12.3