Question

I have done this successfully many times before, but this time it just won’t work.

The code in my .h file:

@interface Images : NSView {

}

- (void) draw;

@end

The .m file (of another object):

- (IBAction) go: (id) sender; {
[Images draw:nil];

}

When I try to compile this, it says the following:

'*' may not respond to '*

Images may not respond to '+draw'

This has me quite confused. Shouldn’t this be working?

Please Note: Yes, I have seen the other questions about messages, but none of those answers was even partially helpful for me. After reading them, I was even more confused.

Answer 1

Your draw method is an instance method: it can only be called on instances of the Images class. In your go: method you’re trying to call it as a class method—if this is what you want, change it to:

@interface Images : NSView
+ (void)draw;
@end