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What is the difference between a C # interface and an Objective-C protocol?

What is the difference between the C # interface and the Objective-C protocol? I ask because I'm immersed in ASP.NET MVC, and I'm trying to understand some of the new concepts, and this will help if I can connect them with my Objective-C iOS programming background.

Thank you for your help!

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They are basically the same. However, in Objective-C 2.0 you can mark some methods in the protocol as "optional" (using the @optional qualifier), which means that classes that implement the protocol are not required to implement these methods.

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Source: https://habr.com/ru/post/970332/

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