//Start splicing Json strings
ns dictionary * data dictionary =[ns dictionary dictionaryWithObjectsAndKeys:@ " MAC " ,@ " MAC "，
@ "Game", @ "Game",
@ "device token", @ "device token",
@ "device", @ "device",
@“gv”，@“gv”，
"Lang", "Lang",
@"os",@"os "，nil]；
ns dictionary * parm dictionary =[ns dictionary dictionaryWithObjectsAndKeys:@ " getSession " ,@ " act "，
dataDictionary，@"data "，nil]；
ns dictionary * jsonDictionary =[ns dictionary dictionaryWithObjectsAndKeys:@ " PV " ,@ " PV "，
parmDictionary，@"param "，nil]；
SBJsonWriter * writer =[[SBJsonWriter alloc]init]；
ns string * jasonString =[writer string with object:jsonDictionary]；
NSLog(@“% @”，Jason string)；
The code above uses three levels of nesting. Note that in NSDictionary, the value comes before and the key comes after.
The results after stitching are as follows:
{"pv":"pv "，" param":{"act":"getSession "，" data":{"os":"os "，" mac":"mac "，" game":"game "，" gv":"gv "，" lang":"lang "，" devicetoken":"devicetoken "，" device":"device"}}}
After parsing with Json online verification tool:
{
“PV”:“PV”，
" param": {
" act": "getSession "，
"Data": {
“OS”:“OS”，
“MAC”:“MAC”，
Game: game,
Lingtai: Lingtai,
Lang: Lang,
"device token": "device token",
"equipment": "equipment"
}
}
}