如何使用JSON框架和Objective-C/iPhone/Xcode解析嵌套的JSON对象？

#import<Foundation/Foundation.h>

NSString *jsonString = @"{ \"name\": \"John\", \"age\": 30, \"city\": \"New York\", \"hobbies\": [\"reading\", \"traveling\", \"photography\"], \"address\": { \"street\": \"123 Main St\", \"city\": \"Los Angeles\", \"state\": \"CA\", \"zip\": \"12345\" } }";

NSError *error;
NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *jsonObject = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error];

NSString *name = jsonObject[@"name"];
NSNumber *age = jsonObject[@"age"];
NSString *city = jsonObject[@"city"];
NSArray *hobbies = jsonObject[@"hobbies"];
NSDictionary *address = jsonObject[@"address"];
NSString *street = address[@"street"];
NSString *state = address[@"state"];
NSString *zip = address[@"zip"];