how to Parse complicated JSON data in iOS - ios

Question

I am using php to get json data and here is response.
{"array":[{"Category":{"charity_id":"2","charity_name":"GiveDirectly","charity_amt":"0.20"}}]}
and here is my Objective-c code
NSError *err;
NSURL *url=[NSURL URLWithString:#"url"];
NSURLRequest *req=[NSURLRequest requestWithURL:url];
NSData *data = [NSURLConnection sendSynchronousRequest:req returningResponse:nil error:&err];
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:&err];
if ([json isKindOfClass:[NSDictionary class]]){
NSArray *yourStaffDictionaryArray = json[#"array"];
if ([yourStaffDictionaryArray isKindOfClass:[NSArray class]]){
for (NSDictionary *dictionary in yourStaffDictionaryArray) {
for(NSDictionary *dict in dictionary[#"Category"]){
NSLog(#"%#",[[((NSString*)dict) componentsSeparatedByString:#"="] objectAtIndex:0] );
}
}
}
}
But this only returns the name's not the value. I have searched most of the question on this site but nothing helped be. Please help me i am new to iOS.
Thanks
Dictionary output is
{
"charity_amt" = "0.20";
"charity_id" = 2;
"charity_name" = GiveDirectly;
}

Answer 1

You don't need to do ComponentSeparatedByString. Once you get the NSDictionary for #"Category", you can get its value by using its keys.
Something like
if ([json isKindOfClass:[NSDictionary class]]){
NSArray *yourStaffDictionaryArray = json[#"array"];
if ([yourStaffDictionaryArray isKindOfClass:[NSArray class]]){
for (NSDictionary *dictionary in yourStaffDictionaryArray) {
NSDictionary *dict = dictionary[#"Category"];
NSLog(#"%#",dict[#"charity_id"]);
}
}
}

Answer 2

Always Remember that when there are { } curly brackets, it means it is Dictionary and when [ ] this, means Array
NSURL *url=[NSURL URLWithString:#"Your JSON URL"];
NSData *data = [[NSData alloc] initWithContentsOfURL:url];
NSMutableDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
NSArray *array = json[#"array"];
for(NSMutableDictionary *dic in array)
{
NSLog(#"%#",dic[#"Category"][#"charity_id"]); // prints 2
NSLog(#"%#",dic[#"Category"][#"charity_name"]); // GiveDirectly
NSLog(#"%#",dic[#"Category"][#"charity_amt"]); // 0.20
}

Answer 3

this is my parser json data, it's demo
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
NSString *urlString = #"https://api.foursquare.com/v2/venues/search?categoryId=4bf58dd8d48988d1e0931735&client_id=TZM5LRSRF1QKX1M2PK13SLZXRXITT2GNMB1NN34ZE3PVTJKT&client_secret=250PUUO4N5P0ARWUJTN2KHSW5L31ZGFDITAUNFWVB5Q4WJWY&ll=37.33%2C-122.03&v=20140118";
NSURL *url = [NSURL URLWithString:urlString];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
// NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
NSOperationQueue *queue = [[NSOperationQueue alloc] init];
[NSURLConnection sendAsynchronousRequest:request
queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
NSString *string = [[NSString alloc] initWithData:data
encoding:NSUTF8StringEncoding];
[self parser:data];
}];
}
- (void)parser:(NSData *)data
{
NSMutableDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:data
options:0
error:nil];
[dictionary enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
[obj enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
}];
}];
}