Hi,
Thanks for providing this plugin!
While using it I encountered a problem because my xcode-project path contains a space.
I solved it by adding quotes in P4Functionality.mm : 152 and 154
So you would get:

command += "cd '"; //note the additional single quote before the last closing double quote
command += workingPath;
command += "'; "; //note the additional single quote before the semicolon in the string

Maybe an idea to make the plugin more robust against this kind of problems ;)
David