Nativescript doesn't recognize Xcode (High Sierra)
Run the following command:
sudo xcode-select --reset
I found this answer here:
I had this problem today, but running the recommended command didn't help. I found that running the command
$ tns doctor
walked me through a series of prompts and corrected the issue. I did have to restart my terminal after the program completed in order for it to take effect.
Open Xcode than go to Preferences -> Locations -> Command Line Tools after that it'll automatically take a path for the same. The system may ask for sudo password.