You have to create actual objects of that class:
MyClass * obj = [[MyClass alloc] init];
then send your '-' messages to that object:
[obj myAction:arg];
You might want to read up some more on object oriented programming so
you know the difference between an object and its class. A class is
basically a template explaining how every object that's made from it
behaves.
On Apr 11, 2008, at 6:31 PM, Kevin Ferguson wrote:
reetings!
This is a rather odd (and I'm sure simple) question, but I cannot
seem to find a suitable explanation anywhere I look.
So, my code initializes a menu with an action "myAction:", whose
target is "myClass".
Now, I've noticed through trial and error that the only way to get
my method to respond to the menu is to mark the method with a + as
opposed to a -.
This means my method declaration is now +(void)myAction:(id)sender { }
So, this much I have working. Now, within that method, I
programmatically create a panel and a few text boxes, along with a
button with the action "doStuff" whose target is also "myClass". At
the end of the method, I tell the panel to display, and everything,
including the button, works fine. (An NSlog put in the doStuff:
method activates) I noticed that the method that my button calls
also must have the + to do anything.
However, the moment I try to access any of my objects (the button,
or text boxes) that I created in the myAction: method, I get a
warning saying that I'm accessing an instance variable from a class
method, even though it is declared in the class's header file. As
such, I can't really interact with it.
Now, I'm entirely self-taught in Cocoa, so this may be something
more obvious than I think. Is there a reason for this occurrence? I
assume it's got something to do with the +, but not knowing what the
+ means, or why my method must be a + to work, I can't really
determine what to do. Can this be explained at all, or can anyone
point me to a place that would explain it?
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