Shulou(Shulou.com)06/02 Report--

In this issue, the editor will bring you what is the basic knowledge of objective c. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

1. Instancetype is similar to id and provides an unspecific type, but it can only be used as a function return type.

2. The class extension is also called an anonymous class because there is no name in parentheses. Class extension is a special category. General categories cannot add instance variables, but class extensions can.

These are the basic knowledge of objective c shared by the editor. If you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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