Failed to build ContentView.swift

Question

Created Dec ’21

Replies 4

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Due to some previous software issues with Xcode, I had to uninstall and reinstall the app. Currently running Xcode 13.2.1.

When I open any of my previous projects, Xcode gives me the error message, "Failed to build ContentView.swift". It will give me this same message for any of my SwiftUI view files (before the software issues noted above, I never had this issue). I've even attempted starting a brand new project from scratch, and it still gives the same error.

I'm running Xcode on a Mac mini (M1, 2020) with macOS Monterey (V12.0.1), if that helps.

Greatly appreciate any solutions to fix so I can get back to building my project. Thank you.

Boost

Answer 1

Developer Tools Engineer OP

Apple

Dec ’21

Sorry to hear you are having problems getting previews working. Best next step will be to file a feedback with diagnostics. We will need the diagnostics Xcode Previews generates in order to make sure we understand the error the previews system is encountering.

When you get an error in Xcode Previews, an error banner appears in the canvas
Click the "Diagnostics" button in that banner
In the sheet that appears, click "Generate Report" in the bottom left of the sheet
Attach (or make from the folder) the resulting zip file to the bug (will be named something like previews-diagnostics-0123456789.zip)

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Answer 2

csmccollum OP

Dec ’21

I believe I have the Diagnostics Report you refer to above (my folder is named: "previews-diagnostics-20211224-212138"), but unsure how to send you the files that you need. When I clicked on "Generate Report" and "OK", the window simply closes, presumably having sent Apple the issue specifics? Forgive my ignorance. Please advise, and thank you for your assistance.

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Answer 3

csmccollum OP

Dec ’21

UPDATE: due to the time-sensitive nature of correcting this issue (and on Christmas Eve, nonetheless), I opted to take a more extreme corrective measure. After backing up all of my data, I did a full restoration to default factory settings on my Mac mini. Once completed and my MacOS was updated to Monterey, I reloaded all of my saved data and reinstalled Xcode. By all apparent indications, this has resolved the issue, whatever the cause.

I should add that the "previous software issues" I was having with Xcode was that while attempted to stop running processes and close the software, Xcode simply gave the endless "spinning rainbow wheel" and wouldn't close. I'm relatively new to Mac, so perhaps this was user error. After an inordinate amount of time, I opted to force close Xcode and restart my Mac. Once restarted, the issue with Xcode failing to build the preview cropped up.

Thank you for taking the time to respond to my issue, and happy holidays to you and your family! God bless you.

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Answer 4

jorge_mz OP

Mar ’22

Preview is not working. Again. Again. Again.

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