This seems to be an issue again, I fixed it by crashing Xcode (it didnt wanna close because it couldnt autosave) via Activity Monitor and then reopening and cleaning build folder.

exactly the same problem, except I can't just update to Big Sur and then the newest Xcode as I don't have enough storage... Since Big Sur takes like 40 something GB to install.

Hi, I am also working on an app which utilises this, but I need the user's input to be limited to some extent. For example I want the counter to only be able to count from -1 to 20. Could someone point me in the right direction with this? Thanks - I am using roughly the code mentioned here.