objective-c - NSMutableArray 中的错误

Question

我是 ios 开发的新手，我正在尝试将一些值从 NSMutableDictionary 添加到 NSMutableArray，当我运行代码时出现此错误

2012-05-29 14:09:34.913 iShop[7464:f803] -[__NSCFArray objectForKey:]: unrecognized selector sent to instance 0x6e423d0 2012-05-29 14:09:34.915 iShop[7464:f803] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFArray objectForKey:]: unrecognized selector sent to instance 0x6e423d0' * First throw call stack: (0x13cb022 0x155ccd6 0x13cccbd 0x1331ed0 0x1331cb2 0x2bb7 0x13cce42 0x93b9df 0x139f94f 0x1302b43 0x1302424 0x1301d84 0x1301c9b 0x12b47d8 0x12b488a 0x15626 0x28bd 0x2825) terminate called throwing an exception(lldb)

下面是我的代码:

-(void) getData:(NSData *) response {
    NSError *error;

    NSMutableDictionary *json = [NSJSONSerialization JSONObjectWithData:response options:kNilOptions error:&error];
    //NSLog(@"%@", json);

    jsonArray = [[NSMutableArray alloc] init];

    jsonArray = [json objectForKey:@"Name"];

    NSLog(@"%@", jsonArray);

}

- (void)viewDidLoad {
    [super viewDidLoad];

    jsonURL = [NSURL URLWithString:@"http://localhost:8888/read_product_list.php"];
    dispatch_async(BgQueue, ^{
        NSData* data = [NSData dataWithContentsOfURL:jsonURL];
        [self performSelectorOnMainThread:@selector(getData:) 
                               withObject:data waitUntilDone:YES];
    });
}

Answer 1

JSONObjectWithData 返回类型为 id 的对象。取决于您收到的 json 数据的结构。收到的数据是 NSDictionary 或 NSArray。在你的情况下，我猜测顶级对象是 NSArray 类型，它不响应 objectForKey