jsonkit使用示例

gistfile1.m

// Do any additional setup after loading the view, typically from a nib.
    NSURLRequest * request = [NSURLRequest requestWithURL:[NSURL    URLWithString:@"http://www.imdida.org/json/city/ip"]];
    NSURLResponse * response;
    NSError *error;
    NSData * jsonData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
    NSDictionary * results = [jsonData objectFromJSONData];
    NSLog(@"%@",[results objectForKey:@"ip"]);