Question

我正在尝试从简单的json响应中获取数据。

第一个日志显示我找到一个名为access_token的项目，但是我不能使用它的objectForKey，我得到[__NSCFString objectForKey:]: unrecognized selector sent to instance 0x72de3b0

我做错了什么？

 for(NSDictionary *item in authResponse)
    {
        NSString *s1 = @"access_token";
        NSString *s2 = [item description];

        NSLog(@"access desc: %@", [item description]);
        if([s1 isEqualToString:s2]){
            NSLog(@"Item: %@", [item objectForKey:@"access_token"]);
        }
    }

Answer 1

authResponse对象是NSDictionary对象，但它中将包含许多其他类型，包括其他NSDictionary个对象。您需要更加谨慎地解释每个成员的解释：

for (NSObject *item in authResponse)
{
    if ([item isKindOfClass:[NSDictionary class]])
    {
        NSDictionary *dictItem = (NSDictionary *)item;
        //  do thing with sub-dictionary
    }
    else if ([item isKindOfClass:[NSString class]])
    {
        NSString *stringItem = (NSString *)item;
        //  do thing with string item
    }
    else if ([item isKindOfClass:[NSNumber class]])
    {
        NSNumber *numberItem = (NSNumber *)item;
        //  do thing with number item
    }
}

从NSDictionary获取json数据

1 个答案: