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我以这种方式读取了一个 JSON 文件：

NSString *fileContentHomework = [[NSString alloc] initWithContentsOfFile:homeworkPath];

SBJsonParser *parserHomework = [[SBJsonParser alloc] init];

NSDictionary *dataHomework = (NSDictionary *) [parserHomework objectWithString:fileContentHomework error:nil];

NSArray *nameofHomework = [dataHomework objectForKey:@"nameH"];
NSArray *homeworkDifficulty = [dataHomework objectForKey:@"difficultyH"];

CHOrderedDictionary* DictionaryHomework = [CHOrderedDictionary dictionaryWithObjects:homeworkDifficulty forKeys:nameofHomework];

...然后...

NSArray *allKeys2 = [DictionaryHomework allKeys];


        for (int i = 0; i < [allKeys count]; i++) {

……

NSString *key2 = [allKeys2 objectAtIndex:i];

            NSObject *obj2 = [DictionaryHomework objectForKey:key2];

            int val;
            val = [key2 intValue];

……

JSON 文件如下所示：

{"difficultyH":["name", "name"],"nameH":["2", "2"]}

我注意到，如果文件中的数据相同，如上所示，应用程序会给我一个 objectAtIndex 错误，而如果数据不同，如以下情况，应用程序工作正常：

{"difficultyH":["name", "name2"],"nameH":["2", "3"]}

为什么？

4

1 回答 1

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它与 JSON 无关。在第一种情况下，您尝试使用重复键构建 NSDictionary。那是行不通的。

于 2012-08-26T14:18:25.333 回答