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Xcode 15.4: "Swift.h" file not found for simulator

Developer Tools & Services Xcode
turtlturt
turtlturt OP
Created Apr ’25
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I'm currently adding swift widgets to my existing ObjC project and building it for ios-simulator causes a "Swift.h" file not found error. it works without issue for device build. I see the file compiled under DerivedData at and set the Header Search Path and User Header Search Path to: $(CONFIGURATION_TEMP_DIR)/$(PROJECT_NAME).build/DerivedSources but it still doesn't work.

Removing the #import "proj-Swift.h" line fixes the issues, but I need to import it to use WidgetCenter ReloadAllTimelines. I checked that the file is being generated correctly by viewing the autogenerated file and its contents.

Any advice and direction would be a great help. Been stuck on this all week and I can't think of a different solution.

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Apple Staff, DTS Engineer
DTS Engineer OP
Apple
Apr ’25

Are you able to shrink your project down to its bare essentials to share it here while reproducing this issue? If so, please share a link to your test project. That'll help us better understand what's going on. If you're not familiar with preparing a test project, take a look at Creating a test project.

— Ed Ford,  DTS Engineer

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Xcode 15.4: "Swift.h" file not found for simulator
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