How come sometimes you need to put the method signature in the .h file and sometimes you don’t?
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How come sometimes you need to put the method signature in the .h file and sometimes you don’t?
Methods which you are overriding from your superclass do not need to be redeclared in your class’s interface. It is sometimes a good idea to do so, but is not required.
Similarly, you do not need to declare methods that you are implementing from a protocol; simply declaring that you conform to the protocol is enough.
You should declare methods which are “new” to your class: those which are not inherited from a superclass nor part of a protocol. This is to give the compiler the necessary information to determine the correct argument and return types and is necessary to the correct running of your application.
Those answerers who have said that you don’t have to declare your methods are technical correct, however be aware that this is a very bad practice as the compiler will infer parameter and return types which may not match the definition and can cause undefined behavior when the method is called.