ios - Objective C and parse.com queries? -

i using parse create simple api service, , want use queries on this.

in tutorial there section describes how done in python simple.

params = urllib.urlencode({"where":json.dumps({    "playername": "sean plott",    "cheatmode": false  })}) 

while in python might simple line this, how do in objective c? first make dictionary, json encode it, transform string , url encode it?