There are XVim and xVim plugins for Xcode, they are made exactly for this.
You can also use KeyRemap4MacBook for this (from answer on stackoverflow and this blog):
Vim mappings / plugin for Xcode
There are XVim and xVim plugins for Xcode, they are made exactly for this.
You can also use KeyRemap4MacBook for this (from answer on stackoverflow and this blog):