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I have a large mixed language (obj-c, swift & c++) project, it builds and runs fine on all platforms

"Build for previews" also seems to complete fine.

Opening preview of a particular swift file fails, e.g.: enter image description here

Diagnostics gives:


Failed to launch swiftc.

==================================

|  HumanReadableNSError: NSInvalidArgumentException
|  
|  com.apple.dt.PreviewsFoundation.ExceptionError (0):
|  ==NSLocalizedFailureReason: too many arguments (4670) -- limit is 4096

I have managed to get previews to work previously. I switched to using prebuilt xcframeworks in the hope of improving the preview build performance, but has gone from slow to not working at all!

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  • Same problem here. Did you manage to find a solution for this? Commented Aug 10, 2022 at 14:45
  • 1
    I did get it working, but what I did was to rewrite the view somewhat - so there is nothing concrete I can attribute it to, I'm afraid. It was quite a complex view which I broke down into smaller ones...so my best guess is some kind of cyclomatic complexity issue... Commented Aug 10, 2022 at 14:57
  • cool, but I have this error on a view that is literally var body: some View { Text("Hello, World!") } Commented Sep 6, 2022 at 12:29
  • Oh, wow. Can you reproduce on a reasonably clean project? Worth raising a radar bug I imagine... Commented Sep 6, 2022 at 15:07
  • Unfortunately not, the project is big and under NDA, but this is a newly generated module with an (almost) empty view and it doesn`t work Commented Sep 7, 2022 at 7:40
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