The document “ViewController.swift” could not be saved. The file doesn’t exist

This happens quite often when moving files around.

What I do:

• Locate the file in your project folder and drag to desktop
• In xcode delete the file
• Close Xcode, you may have to force quit if it keeps showing the The document “ViewController.swift” could not be saved. The file doesn’t exist. alert.
• Reopen xcode and drag the file from your desktop to the folder in xcode project where you want it to be.
• Build and the message should have gone.

Make a zip of that project and delete the original project. After that force quit the system. Then start the system again and unzip the zipped project. Thank-You