Xcode

Checking Xcode SDK Path

Will check whether SDK is linked with path. Command Line tools should be installed and symlinked with path.

xcrun -k --sdk iphoneos --show-sdk-path

Installing Command Line tools

This command would install the Command line tools on the machine.

xcrun -k --sdk iphoneos --show-sdk-path

Multiple Xcode Developer tools

If you have multiple versions of the Apple developer tools installed (an Xcode beta, for example), use xcode-select to change which version xcode or other build tool uses.

Show which xcode path is being used in Command Line Tools.

xcode-select -p

Switch Xcodes

GUI

Xcode -> Preferences -> Locations

CLI

You should be pointing it towards the Developer directory, not the Xcode application bundle.

sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer

Swift

Check Swift Version

xcrun swift -version

## Output
swift-driver version: 1.90.11.1 Apple Swift version 5.10 (swiftlang-5.10.0.13 clang-1500.3.9.4)
Target: x86_64-apple-macosx14.0

You can check it in Xcode project GUI as well.
Select Target -> Build Settings -> Search Swift Language Version