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所以我在为 iOS 开发方面真的很新，我一直在尽我所能，寻找答案，调试它以及我能想出的任何东西。

虽然，我还没有找到解决这个问题的办法。

我一直在尝试获取一个外部 JSON 文档，它工作正常，但是在解析它时，它就出错了。

首先，这是我收到的错误消息，全部内容。

2013-01-31 22:40:19.261 demodh[6205:c07] View Loaded
2013-01-31 22:40:19.479 demodh[6205:c07] -[__NSCFStringcountByEnumeratingWithState:objects:count:]: unrecognized selector sent to instance 0x7554f90 
2013-01-31 22:40:19.480 demodh[6205:c07] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString countByEnumeratingWithState:objects:count:]: unrecognized selector sent to instance 0x7554f90'
*** First throw call stack:
(0x1c93012 0x10d0e7e 0x1d1e4bd 0x1c82bbc 0x1c8294e 0x28d3 0xbd6589 0xbd4652 0xbd589a 0xbd460d 0xbd4785 0xb21a68 0x4615911 0x4614bb3 0x4652cda 0x1c358fd 0x465335c 0x46532d5 0x453d250 0x1c16f3f 0x1c1696f 0x1c39734 0x1c38f44 0x1c38e1b 0x1bed7e3 0x1bed668 0x14ffc 0x1d6d 0x1c95 0x1)
libc++abi.dylib: terminate called throwing an exception
(lldb)

这是我目前正在使用的代码：

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSDictionary *allDataDictionary = [NSJSONSerialization JSONObjectWithData:webData options:0 error:nil];

    for(NSDictionary *dict in allDataDictionary)
    {
        if (![allDataDictionary isKindOfClass:[NSDictionary class]])
        {
            NSLog(@"2Unable to process temp array because it's an instance of %@", [allDataDictionary class]);
        }
        else
        {
            for(NSDictionary *deal in dict)
            {
                if (![deal isKindOfClass:[NSDictionary class]])
                {
                    NSLog(@"Unable to process temp array because it's an instance of %@", [deal class]);
                }
                else
                {
                    NSString *title = [deal objectForKey:@"title"];
                    NSLog(title);
                }
            }
        }

    }
}

我正在加载的 JSON 是：链接

我希望你能帮助我找到解决方案。

4

1 回答 1

2

问题是你正在快速枚举 aNSDictionary并期望得到它的值，而实际上你会得到它的键。当您尝试快速枚举 an时，NSString您会得到您所看到的断言。你可能想要这个：

for(NSObject *key in allDataDictionary) {
    NSDictionary *dict = allDataDictionary[key];
    ...
    for (NSObject *dealKey in dict) {
         NSDictionary *deal = dict[dealKey];
    }
    ...

或者，如果您真的想枚举值并且不需要键：

for(NSDictionary *dict in [allDataDictionary allValues]) {
    ...
于 2013-01-31T22:08:57.243 回答