在Objective-C中創建一個抽象類 - Creating an abstract class in Objective-C

問題：

I'm originally a Java programmer who now works with Objective-C. 我原來是一名Java程序員，現在使用Objective-C。 I'd like to create an abstract class, but that doesn't appear to be possible in Objective-C. 我想創建一個抽象類，但在Objective-C中似乎不可能。 Is this possible? 這可能嗎？

If not, how close to an abstract class can I get in Objective-C? 如果沒有，我可以在Objective-C中獲得一個抽象類的接近程度？

---

解決方案：

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