RunInXcode.scpt

tell application "Xcode"
	activate
	tell application "System Events"
		perform (keystroke "r" using command down)
	end tell
end tell

sencha-build.sh

#!/bin/bash

sencha app build native && osascript "/Users/luke/Documents/Scripts/RunInXcode.scpt" && finished "Sencha App build running!"

sencha.sublime-build

{
  "cmd": ["sh", "/Users/luke/somewhere/sencha-build.sh"],
  "path": "/Users/luke/bin/Sencha/Cmd/4.0.0.203:$PATH"
}