从NSDictionary中提取价值

Question

I have a NSDictionary called data and when I print using NSLog it gives me: 我有一个称为数据的NSDictionary，当我使用NSLog打印时，它给了我：

DATA IS {
    aps =     {
        alert = "aherlambang liked your photo";
        badge = 1;
    };
    "media_id" = "220516456473412852_29088696";
}

I tried to extract the media_id by doing: 我试图通过执行以下操作来提取media_id：

 NSLog(@"DATA IS %@ MEDIA ID IS %@", userInfo, [userInfo valueForKey:@"media-id"]);

but it always gives me null. 但它总是使我无效。 Why is this? 为什么是这样？

Answer 1

Your key in the data is "media_id" , and you're trying to use the key "media-id" . 数据中的密钥为"media_id" ，并且您尝试使用密钥"media-id" 。

Change "media-id" to "media_id" and you should be able to read your dictionary. 将"media-id"更改为"media_id" ，您应该能够阅读字典。

 NSLog(@"DATA IS %@ MEDIA ID IS %@", userInfo, [userInfo valueForKey:@"media_id"]);

Answer 2

也许是因为您的字典被命名为data，而您正在访问的用户是不是？