Sending a Selector to another Class. And Creating an Instance of A Class.

Question

How would I send a Selector to another class? I know to send it to a selector in the same file you do

[self performSelector:@selector(doSomething)];

and for sending it to another class I've tried

[otherClass performSelector:@selector(doSomethingElse)];

But I just get an error in the Debugger saying

+[otherClass doSomethingElse]: unrecognized selector sent to class 0xe5c4

Why is this??

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EDIT In Response To Daves Answer

' Chances are it's not a class method but rather an instance method … '

How do I create an Instance of My Class then?

Answer 1

From the debug message +[otherClass doSomethingElse] it says that you're sending it to the class itself, which means you're trying to invoke a class (static) method.

Chances are it's not a class method but rather an instance method, which means you should be doing:

[anInstanceOfOtherClass performSelector:@selector(doSomethingElse)];

Answer 2

-(void) removeObserver {…}

There's your problem. The - sign identifies this as an instance method; that is only run on objects of the class. What you need to do is declare and define it as:

+(void)removeObserver …

and you can call this as:

[JGManagedObject removeObserver];

That way, you wont need to use performSelector: to avoid the error message you get when sending an instance message to a class.

To help you along, here's the relevant documentation.