Reference properteries declared in a protocol and implemented in the anonymous category?

What you've been referring to as an "anonymous category" is actually known as a class extension and is used to declare private functionality in an implementation file. That last part is important, because it means that other classes will not be able to see the declarations that you put into a class extension (and they won't be able to see that your class implements the methods of MyProtocol ). This is also probably what is responsible for synthesize failing without redeclaring the properties.

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