When debugging:
The line about to be executed is highlighted in green in the main editor
The stack backtrace of each thread is shown by the debug navigator (View > Navigator > Show Debug Navigator)
Variables are shown in the debug area (View > Debug Area > Show Debug Area) — You can use the controls at bottom right of the debug area to show and hide the variables view and console area independently.
You can step through code using the buttons in the debug bar (or the equivalent commands in the Debug menu)
The Xcode help talks about this in depth; choose Xcode Help from the Help menu, or visit this URL in your browser.
Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
let myEmail = "eskimo" + "1" + "@apple.com"