keystroke to indent code

You can see all the keystrokes in Xcode Preference -> Key Bindings. Type "indent" in the filter field and you'll see the answer.

(Well, that's for the Re-indent command. If you want the commands to shift left or right one tab stop, type "shift left" or "shift right" in the filter field.)

I can't find it. I knew it at one time. It allows me to automatically indent selected code in whatever direction is needed.

It is Re-Indent after all. ^I is the keystroke.