1     //{"code":"login_success","message":"abcdeeeee"} 2     //以{}表示的是字典  3     //“:”key，value分隔符 4     //“，”元素分隔符 5      6     NSString* str = @"{\"code\":\"login_success\",\"message\":\"abcedsdfsdf\"}"; 7      8     NSDictionary* dic = [str JSONValue]; 9     10     NSString* codeStr = [dic objectForKey:@"code"];11     NSString* messageStr = [dic objectForKey:@"message"];12     13     NSLog(@"%@",codeStr);14     NSLog(@"%@",messageStr);

1     //["a","b","c"]2     //[]表示的是一个数组3     4     str = @"[\"a\",\"b\",\"c\"]";5     NSArray* array = [str JSONValue];6     for (NSString* str in array) {7         NSLog(@"%@",str);8     }

1     //{"num":"3","names":["a","b","c"]}2     str = @"{\"num\":\"3\",\"names\":[\"a\",\"b\",\"c\"]}";3     NSDictionary* jsonDic = [str JSONValue];4     NSLog(@"%@",[jsonDic objectForKey:@"num"]);5     NSArray* jsonArray = [jsonDic objectForKey:@"names"];6     NSLog(@"%@",jsonArray);

1     //[NSString stringWithContentsOfURL:]2     NSString* urlStr = @"http://192.168.88.8/sns/my/user_list.php";3     NSURL* url = [NSURL URLWithString:urlStr];4     NSString* jsonStr = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];5     dic = [jsonStr JSONValue];6     NSLog(@"%@",[dic objectForKey:@"totalcount"]);

1     //NSURL->NSData 2     NSData* data = [NSData dataWithContentsOfURL:url]; 3      4     //NSData->NSString 5     str = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease]; 6      7      8     //NSString->NSData 9     //data = [str dataUsingEncoding:NSUTF8StringEncoding];10     11     //NSData->UIImage12     //UIImage* image = [UIImage imageWithData:data];13     14     //UIImage->NSData15     //data = UIImagePNGRepresentation(image);