Xcode - Duplicate Line Shortcut

1 . Go to this folder :

　　Xcode 4.2 or prior: 

/Developer/Library/PrivateFrameworks/IDEKit.framework/Resources

　　Xcode 4.3 and later: 

/Applications/Xcode.app/Contents/Frameworks/IDEKit.framework/Resources

 

　　Then open the file : 

IDETextKeyBindingSet.plist

 

 

2 . Create a dictonary named "Customized" ,

add key :

Duplicate Current Line

and value :

selectLine:, copy:, moveToEndOfLine:, insertNewline:, paste:, deleteBackward:

(be careful that the "space" is needed between the every Meta Commands)

 

3 . Restart Xcode and go to Preferences - Key Bindings, search "Dubplicate Current Line" . Finally , set a key shortcut combination for this command .

 

Additional :

You can override the default shortcuts by creating a new command set with your preferred shortcuts.

This new set is stored in :

 ~/Library/Developer/Xcode/UserData/KeyBindings/{you named}.idekeybindings.