Objective-C的抽象类 [英] Abstract class for Objective-C

问题描述

可能重复：

在目标C中创建抽象类

我想在Objective-C项目中创建抽象类。

I'd like to make abstract class in Objective-C project.

但是，我找不到诸如抽象（java），虚拟之类的想法。 （在C ++中）。

But, I can't find ideas suchlike 'abstract'(in java), 'virtual'(in c++).

Objective-C是否有一个抽象的主意？谢谢。

Doesn't Objective-C have an abstract idea? Thank you.

推荐答案

形式上，不。通过在基类中存根方法，然后记录子类必须实现这些方法，可以实现抽象类。由作者负责编写与类协定匹配的类，而不是由编译器来检查是否缺少方法。

Formally, no. Abstract classes are implemented by stubbing out methods in the base class and then documenting that a subclass must implement those methods. The onus is on the author to write classes that match the class contract rather than on the compiler to check for missing methods.

Objective-C具有协议，类似于Java接口。如果您要寻找Java中的纯虚拟 C ++类或接口的等效项，这就是您想要的。

Objective-C has protocols, which are like Java interfaces. If you're looking for the equivalent to a pure virtual C++ class or an interface in Java, this is what you want.

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