I have finally jumped into the bandwagon of Objective-C development with XCode, out of curiousity to develop an iPhone application. And the first thing that I usually did when playing with a new IDE or editor is to learn the shorcuts.

And thanks to Colin Wheeler for the cheat-sheet:
http://cocoasamurai.blogspot.com/2008/02/complete-xcode-keyboard-shortcut-list.html

The cheat-sheet is comprehensive, and out of those, here are of ones that I find I can’t live without.

Alt+Shift+Up      -> Switch between header and implementation files
Alt+Shift+Left    -> Switch to the previous opened file
Alt+Shift+Right   -> Switch to the next opened file

Cmd+Double Click  -> Jump to the file definition for the clicked class name
Alt+Double Click  -> Jump to documentation window for the clicked word
Shift+Cmd+D       -> Open file quickly
Shift+Cmd+C       -> Open Class Browser window

Ctrl+?            -> Open documentation window
Ctrl+Alt+?        -> Open research assitant window
Ctrl+1            -> Show opened file dropdown
Ctrl+2            -> Show methods drop down

Option+Escape     -> Edit completion list
Ctrl+Period       -> Move to next completion list
Ctrl+/            -> Select next placeholder in auto completion brackets
Cmd+/             -> Comment text

Strangely I couldn’t find the Delete Line and Duplicate Line shortcuts in XCode, miss the equivalent of ‘yy’ and ‘dd’ in vim or Ctrl+Shift+K and Ctrl+Shift+D in Textmate. Tried custom key bindings from TypeErrorStudios, but not working my MBP, let me know if it works on your end. Thanks.