If we press ctrl+command+up arrow we switch between file code and header code. (.m to .h)
If we press ctrl+command+j or command + mouse click we jump to definition of variable. But it not work for super.
So, there are a fast way to do it?
Try Command + Shift + D. Jump to definition. Does that work?
Also check out the link bellow. It lists a bunch of Xcode keyboard shortcuts. http://developer.apple.com/library/mac/#documentation/IDEs/Conceptual/xcode_help-command_shortcuts/Introduction/Introduction.html%23//apple_ref/doc/uid/TP40010560-CH1-SW1