How can I skip code signing for development builds in Xcode?

As of Xcode 10, here is how to turn off code signing for a macOS app:

1. Select your project in the project navigator.
2. Select your app in the list of targets.
3. Click “Build Settings”.
4. Click “All”.
5. Click “Levels”.
6. Type “identity” into the search field.

7. Click on the Code Signing Identity row, under the column for your app target (labeled “test” in my example). That cell of the table might appear empty.

8. In the pop-up menu that appears, choose “Other…”.

9. In the popover text box that appears, delete all text so the box is empty.

10. Press return to dismiss the popover.

With this setting, Xcode will not sign your app target.