How to create a json array from these json objects in iOS - ios

Question

I have a dictionary that looks like this.
NSDictionary *dict = #{#"cpu" : self.proData ,
#"date" : timeMilliString,
#"memory" : self.memData,
#"battery" : self.batData,
#"deviceID" : #"1"
};
I'm creating json objects from it like this:
self.jsonObj1 = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:&error];
self.jsonObj2 = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:&error];
self.jsonObj3 = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:&error];
Afterwards I want to put the 3 json objects into a json array and then put that json array into another json object. So finally, it should look something like this:
{"mobileData":[
{ "cpu":-991,
"date":"142441374.5834",
"memory":978,
"battery":-96,
"deviceID" : 2
},
{ "cpu":-51,
"date":"142441374.5834",
"memory":978,
"battery":-96,
"deviceID" : 2
},
{ "cpu":-51,
"date":"142441374.5834",
"memory":978,
"battery":-96,
"deviceID" : 2
}
]
}
I have tried it as follows but it's not working.
NSArray *jsonArray = #[self.jsonObj1, self.jsonObj2, self.jsonObj3];
NSDictionary *dict = #{#"mobileData" : jsonArray};
if ([NSJSONSerialization isValidJSONObject:dict])
{
// Serialize the dictionary
json = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:&error2];
// If no errors, let's view the JSON
if (json != nil && error2 == nil)
{
NSString *jsonString = [[NSString alloc] initWithData:json encoding:NSUTF8StringEncoding];
NSLog(#"JSON: %#", jsonString);
//[jsonString release];
}
}
I'm getting an exception.
Any ideas? Thanks.

Answer 1

Firstly add all dictionaries to a array.
NSMutableArray *mutArrData = [NSMutableArray array];
//Add dictionaries which vary to your requirement.
[mutArrData addObject:yourDictionary]; //1
[mutArrData addObject:yourDictionary]; //2
[mutArrData addObject:yourDictionary]; //3
Now create a main dictionary to add array.
NSDictionary *dictJsonData = [NSDictionary dictionaryWithObjectsAndKeys:[mutArrData mutableCopy],#"mobileData",nil];
Now create json from dictionary
NSError *error = nil;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dictJsonData options:NSJSONWritingPrettyPrinted error:&error];
if (jsonData && !error)
{
NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
NSLog(#"JSON: %#", jsonString);
}