Mac storage basics · Developer tools
Can I delete Xcode's iOS DeviceSupport folder?
Short answer: Yes — it holds debugging support files for each device OS version you've connected. Delete old versions; Xcode recreates them if you connect such a device again.
Yes. Xcode copies debugging support files from each iOS (and watchOS, tvOS) version of a device you connect for development. Old versions you no longer debug against can be deleted from ~/Library/Developer/Xcode/iOS DeviceSupport.
If you connect a device with one of those versions again, Xcode prepares the files again, which takes a few minutes.