iphone - 为什么 __NSCFDictionary 不是一种 NSDictionary 类

Question

在 JSON 解析期间(使用 AFNetwork json getter 完成)，我有以下代码片段:

if (![[data class] isKindOfClass:[NSDictionary class]]) {
    DLog(@"%@ was not kind of class NSDictionary",[data class]);
    return;
}

但由于某些原因，If语句变为true，函数返回:

> __NSCFDictionary was not kind of class NSDictionary

但是 __NSCFDictionary 不应该是特定的类 NSDictionary 吗？或者如果这是错误的验证方式，我该怎么做？

更新:

我尝试扭转它，就像这样:

        if (![[NSDictionary class] isKindOfClass:[data class]]) {
            DLog(@"%@ was not kind of class NSDictionary",[data class]);
            return;
        }

仍然不起作用:

__NSCFDictionary was not kind of class NSDictionary

Answer 1

根据docs

isKindOfClass:
Returns a Boolean value that indicates whether the receiver is an instance of given class or an instance of any class that inherits from that class. (required)

您正在使用

[data class]

它将返回一个字符串..您必须仅使用对象/实例，即

if (![data isKindOfClass:[NSDictionary class]])