Xcode - cycle through previously opened documents

You can use control-2 to bring up the history menu, then up and down to select the file you want. Then control-3 to move forward.

One approach is to use more tabs. In the General tab of Xcode's Preferences (as of Xcode 4.6.3), set “Double Click Navigation” to “Use Separate Tab”:

Then, when you open files by double-clicking them, they will open in new tabs. You can navigate between tabs by typing ⌘ { and ⌘ } (command-shift-left bracket and command-shift-right bracket). You can rebind the “Select Next Tab” and “Select Previous Tab” commands in the Key Bindings preferences if you want to use other keys.

Try ctrl + cmd + left Arrow/right Arrow