JSON response and NSDictionary - ios

Question

I am new in the iOS development and i am calling the web service that returns me data like
[
{
"ID": "3416a75f4cea9109507cacd8e2f2aefc3416a75f4cea9109507cacd8e2f2aefc",
"Name": "2M Enerji"
},
{
"ID": "072b030ba126b2f4b2374f342be9ed44072b030ba126b2f4b2374f342be9ed44",
"Name": "Çedaş"
},
{
"ID": "093f65e080a295f8076b1c5722a46aa2093f65e080a295f8076b1c5722a46aa2",
"Name": "Çelikler"
},
{
"ID": "7cbbc409ec990f19c78c75bd1e06f2157cbbc409ec990f19c78c75bd1e06f215",
"Name": "Çoruh EDAŞ"
},
{
"ID": "70efdf2ec9b086079795c442636b55fb70efdf2ec9b086079795c442636b55fb",
"Name": "İçdaş"
}
]
Now i am trying to get it in the array , the array will be seperate for the name and id , i am done till taking in NSDICT following is my code
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSLog(#"finish loading");
NSString *loginStatus = [[NSString alloc] initWithBytes:[webData mutableBytes]
length:[webData length]
encoding:NSUTF8StringEncoding];
NSString *responsewith = [[NSString alloc] initWithData:webData
encoding:NSUTF8StringEncoding];
//providerData = [NSKeyedUnarchiver unarchiveObjectWithData:webData];
providerDropData = [NSString stringWithFormat:responsewith];
NSLog(#"drop %#",providerDropData);
NSArray *providerData = [providerDropData valueForKey:#"ID"];
NSLog(#"jey %#",responsewith);
NSLog(#"resonser %#",responsewith);
NSLog(#"laoding data %#",loginStatus);
//greeting.text = loginStatus;
[loginStatus release];
[connection release];
[webData release];
}
When i tried saving the NSDictionary to the NSArray for #"ID" the application get crashed.
Please help

Answer 1

You simply want to use NSJSONSerialization
NSError *error = nil;
NSArray *results = [NSJSONSerialization JSONObjectWithData:webData options:0 error:&error];
if (!results)
NSLog(#"%s: JSONObjectWithData error: %#", __FUNCTION__, error);
// get the first provider id
NSString *providerData = results[0][#"ID"];

Answer 2

You can fetch data from JSON like below way as well,
id jsonObjectData = [NSJSONSerialization JSONObjectWithData:webData error:&error];
if(jsonObjectData){
NSMutableArray *idArray = [jsonObjectData mutableArrayValueForKeyPath:#"ID"];
NSMutableArray *nameArray = [jsonObjectData mutableArrayValueForKeyPath:#"Name"];
}

Answer 3

Convert the data to NSDictionary by parsing, then you can extract using KVP.
NSDictionary *responseDict = [NSJSONSerialization JSONObjectWithData:response options:0 error:&error];

Answer 4

NSDictionary * providerDropData = [NSJSONSerialization JSONObjectWithData:webData error:&error];
NSLog(#"drop %#",providerDropData);
NSMutableArray *providerData = [NSMutableArray new];
NSString *key = #"ID";
for (key in providerDropData){
NSLog(#"Key: %#, Value %#", key, [providerDropData objectForKey: key]);
[providerData addObject:[providerDropData objectForKey:key]];
}
NSLog("ID Array = %#", providerData]);
}