How to resolve `No method with selector is implemented in this translation unit`?

I got this error like the image below.

<img src="https://i.stack.imgur.com/p5pIp.jpg" alt="Image">

the showSingerInfo method is defined in parent class.

How can I resolve this warning??


It looks like Clang is unable to resolve the declaration of the showSingerInfo: method.

I'm guessing that showSingerInfo: is a local method within the translation unit/class? If so try either of the following.

<ol> <li>

Add the method declaration to your class header file.

</li> <li>

If you do not want to publicly expose the method declaration then create a local/private category in your class implementation file and declare it there.

</li> </ol>


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