Iphone 异常“NSInvalidArgumentException”：-[\uu NSArrayM objectForKey:]：发送到实例0x752c670的选择器无法识别

我使用sbjson解析json， 这是我试图解析的Json：

{"R":"0","S":"","T":"","M":[{"C00":"2013-08-16 17:35:03"}]}

这是我的代码：

NSString *response = [self post:@"9903" content:payload state:@""];
NSDictionary *dict = [response JSONValue];
NSString *result = [dict objectForKey:@"R"];
NSLog(@"result=%@",result);
if ([@"0" isEqualToString:result]) {
    NSDictionary *msg = [dict objectForKey:@"M"];
    NSString *C00 = [msg objectForKey:@"C00"];//here the exception Statement
    NSString *tokenString = [NSString stringWithFormat:@"%@",C00];
    NSLog(@"tokenString%@",tokenString);
    return tokenString;
}else {
    return nil;
}

异常日志：

2013-08-16 17:45:44.902 VEP[4731:c07] -[__NSArrayM objectForKey:]: unrecognized selector    sent to instance 0x7250300
2013-08-16 17:45:44.903 VEP[4731:c07] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7250300'

怎么了？谢谢你的帮助

因为您的键“M:”不仅包含字典，还包含字典数组。所以，把它写成一个

NSDictionary *msg = [[dict objectForKey:@"M"] objectAtIndex:0];

---

阅读错误消息并将其与JSON数据进行比较。Spoiler:[dict objectForKey:@M]返回一个数组，而不是一个字典。顺便说一句：JSON\uu NSArrayM objectForKey unrecognized selector有许多Google点击，它们准确地描述和解释了您的问题。它成功了！但我还是很困惑，你能给我详细的信息吗？谢谢！你有什么问题？好吧，我看了一下json的定义，现在明白了，谢谢，iPatel！