如何在Objective C中使用NSData创建json对象？

Question

How to create json Object with NSData in Objective C . I'm having values in a NSData variable.

Answer 1

You can use it like this in iOS 5 (if you are sure of your json structure you can directly use NSArray or NSDictionary doing a cast)

NSError *jsonError;
id jsonDictionaryOrArray = [NSJSONSerialization JSONObjectWithData:myData options:NULL error:&jsonError];
if(jsonError) {
    // check the error description
    NSLog(@"json error : %@", [jsonError localizedDescription]);
} else {
    // use the jsonDictionaryOrArray
}

Answer 2

if you have a value in NSData object then you can convert it in NSString variable like bellow

NSString *response = [[NSString alloc] initWithData:receivedData
                                                encoding:NSUTF8StringEncoding];

Edited...

i am not sure what you want but i give you the json array from string like bellow..

NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
    [responseData release];

    NSError *error;
    SBJSON *json = [[SBJSON new] autorelease];
    NSArray *arrData = [json objectWithString:responseString error:&error];
    [responseString release];

you can get data in array

hope this help you mate...

:)

Answer 3

NSData *jsonData = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"youur link"]];
id jsonObjects = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:nil];
if([jsonObjects isKindOfClass:[NSArray class]]){
    //Is array
}else if([jsonObjects isKindOfClass:[NSDictionary class]]){
    //is dictionary
}else{
    //is something else
}

EDIT FOR SWIFT

do {
        if let jsonArray = try JSONSerialization.jsonObject(with: data, options : .allowFragments) as? [Dictionary<String,Any>] {

        } else {
            print("bad json")
        }
    } catch let error as NSError {
        print(error)
    }