在Objective-C中创建一个抽象类 - Creating an abstract class in Objective-C

问题：

I'm originally a Java programmer who now works with Objective-C. 我原来是一名Java程序员，现在使用Objective-C。 I'd like to create an abstract class, but that doesn't appear to be possible in Objective-C. 我想创建一个抽象类，但在Objective-C中似乎不可能。 Is this possible? 这可能吗？

If not, how close to an abstract class can I get in Objective-C? 如果没有，我可以在Objective-C中获得一个抽象类的接近程度？

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解决方案：

参考一： https://stackoom.com/question/4L5R
参考二： Creating an abstract class in Objective-C