iPhone SDK: Delegate method not getting called-Troubleshooting

Question

If a Delegate method is not getting called, then what all things needs to be checked just to ensure that delegate is referenced in the viewController?

score 5 · Accepted Answer · answered Feb 22 '11 at 08:56

Well, for a start you have to conform to the protocol in your header:

@interface MyViewController : UIViewController <YOUR DELEGATE'S PROTOCOL HERE, 
                                                           UITableViewDelegate>{

}

@end

That's the most common mistake, anyway.

Also just make sure that you're setting your delegate. Normally you can do that like this:

myObject.delegate = self;

Though some classes do it in the initalization:

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"MY APP"
                                                message:@"HELLO" 
                                               delegate:self 
                                      cancelButtonTitle:@"CLOSE" 
                                      otherButtonTitles:nil];

Thanks for the input . This is all what we have to do? No other place we have to declare it right? — Parth Bhatt, Feb 22 '11 at 08:58
Not normally. Though as @occulus has said, you can often set the delegate directly from Interface Builder. — Aurum Aquila, Feb 22 '11 at 09:00

score 0 · Answer 2 · edited Jul 07 '13 at 10:06

0

If delegate methods aren't getting called when you are expecting them to, it's possible that you haven't actually hooked up the delegate. This can be done either in code, or in interface builder. For example, a UITableView in interface builder can have its dataSource and delegate outlets attached to a target, for example "File's owner".

edited Jul 07 '13 at 10:06

Girish

4,692
4
35
55

answered Feb 22 '11 at 08:57

occulus

16,959
6
53
76

iPhone SDK: Delegate method not getting called-Troubleshooting

2 Answers2