FB12527597: Previews fail to build with linker error when using SwiftData about reports HOT 21 OPEN

Turns out this is listed as a known issue in the Xcode 15 beta 3 release notes:

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not fixed on beta 4

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Same here :( How can such a major bug slip through? Or is there a way to use SwiftData without the @model macro?

You can use SwiftData but you have to comment out the new #Previews which makes is a bit inconvenient

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This seems to be an issue with SwiftData. I was having the same problem, and removing the @model macro annotation (and associated code) corrected the preview issue. Obviously not ideal, but helps narrow it down.

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can confirm, my app I had converted to SwiftData no longer builds

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Managed to get mine to build (first one took a while), but not being able to use previews is not very convenient at all.

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Can confirm this as well. Can build to simulator and phone with no issue but the preview canvas fails due the @model macro associated with SwiftData.

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Turns out this is listed as a known issue in the Xcode 15 beta 3 release notes:

Good catch! I need to be better in the future about going line-by-line in the release notes. Thanks for pointing this one out!

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I have the same issue when building the app to place it on my device. Is there a workaround for this to test the app on our devices?

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having the same problem. What is strange is that I erased the Hard Drive and did a fresh install and then a fresh install of Xcode Beta 3 and right away, I am having the same problem. And again, once I remove @model the problem goes away

Undefined symbols:

Linker command failed with exit code 1 (use -v to see invocation)

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Same here :( How can such a major bug slip through? Or is there a way to use SwiftData without the @model macro?

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Same here :( How can such a major bug slip through? Or is there a way to use SwiftData without the @model macro?

You can use SwiftData but you have to comment out the new #Previews which makes is a bit inconvenient

Ah… I haven’t tried using the old Preview struct. If this still works, it’s only half as bad.

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Yup and the good old PreviewProvider also does not work :<

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The issue only appears with @model macro when using SwiftData. Even with old PreviewProvider, it does not work. And beta 4 does not fix the issue... (it is still written as a known issue)

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This has been mentioned in the Xcode 14 beta 4 release notes:

• Previewing view code in a SwiftData app results in a linker failure for the canvas despite that code compiling successfully for device and simulator. (111657477)
  Workaround: Run your app in the simulator to test your UI instead of using Previews.

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This has been mentioned in the Xcode 14 beta 4 release notes:

• Previewing view code in a SwiftData app results in a linker failure for the canvas despite that code compiling successfully for device and simulator. (111657477)
  Workaround: Run your app in the simulator to test your UI instead of using Previews.

I tried to run my app on my own iPhone, it still didn't work...

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This has been mentioned in the Xcode 14 beta 4 release notes:

• Previewing view code in a SwiftData app results in a linker failure for the canvas despite that code compiling successfully for device and simulator. (111657477)

Workaround: Run your app in the simulator to test your UI instead of using Previews.

I tried to run my app on my own iPhone, it still didn't work...

Must be something different then. For me both simulator and own device do work.

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Must be something different then. For me both simulator and own device do work.

Could you show me a quick example, with a simple @model class, with a single view?

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Simulator and devices all work for me but the #Preview code must be commented out or previews disabled in the editor otherwise I get the error

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I also commented out the function to generate the preview #Preview, the error disappears. However, it's not very convenient to rebuild the project every time, especially when making small changes in the interface. Hopefully, someone will fix this issue soon.

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Look's like the problem is solved by installing Xcode 15 beta 5 ✅

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