Does every action method need a sender object?

Question

Can I just omit the parameter completely? I cannot seem to find a use for it within my IBAction method.

You'd use this if you had 2 objects which were calling that selector and you wanted to distinguish between them.http://stackoverflow.com/a/5578158/944634 — Parag Bafna, Jul 22 '12 at 19:19

Olotiar · Accepted Answer · 2012-07-22T18:36:49.377

1

Yes, you can omit it if you don't want it:

-(IBAction)action{
    // some stuff
}

Although it can come in handy in a lot of situations

edited Jul 22 '12 at 18:36

answered Jul 22 '12 at 18:28

Olotiar

[inputBox addTarget:self action:@selector(display:nil) forControlEvents:UIControlEventEditingDidEndOnExit]; because unfortunately this is not syntactically correct somehow – Skyler Jul 22 '12 at 18:34
[inputBox addTarget:self action:@selector(display) forControlEvents:UIControlEventEditingDidEndOnExit]; is, if the method is defined like -(void)display{ // stuff } – Olotiar Jul 22 '12 at 18:35
Oh wow, I see, I sort of had that earlier before adding nil, had a leftover colon. Thank you Olotiar. – Skyler Jul 22 '12 at 18:42

1 Answers1