Beware your idevice must be jailbroken as it requires you to edit a file in the game directory.
With winscp for instance browse to : /private/var/mobile/Appli cations/"RANDOM HEXADECIMAL DIRECTORY NAME"/Library/Application Support/Independent/xiaox iao/ikongfu/
Open the only file in it "mission.data" and you'll see something almost like that (I suggest you open it with winscp embedded editor or notepad++, notepad would display it in a line 610000044544) :
You'll have, in order of appearance, all missions completed, 100'000 EXP, "Fist" Level MAX, "Blade" Level MAX, "Nunchaku" Level MAX (yes somehow it's the only weapon getting to level 5), "Sword" Level MAX, "Stick" Level MAX.
(note that I didn't even finished the game as I wrote this, so I just assumed there were only 6 levels, feel free to adapt this as you want as I take no responsibility for you trying to use this cheat and find yourself messing up with your game (I hardly think it would mess up your device though lol), I only suggest all this to iPlayers aware of what they're doing and were simply looking for the file.