iOS problem with Delegates..

I am using the Exploring Iphone SDK by Dave and Jeff.

So far I am able to pick up everythin. But yesturday I came across a chapter which uses delegates like this...

interface Control_FunViewController : UIViewController <UIActionSheetDelegate> {
IBOutlet UITextField *nameField;
IBOutlet UITextField *numberField;
IBOutlet UILabel *sliderLabel;
IBOutlet UISwitch *leftSwitch;
IBOutlet UISwitch *rightSwitch;
IBOutlet UIView *switchView;
IBOutlet UIButton *doSomethingButton;


}

Where can read to know more about why <UIActionSheetDelegate> is used. I mean I want to learn more about delegates in cocoa touch frame work. Any good link for this...??

Thanks

Sorry for the confusion..it should have been protocols.

I read this
http://developer.apple.com/DOCUMENT...#//apple_ref/doc/uid/TP30001163-CH15-BAJJABHJ

It was very usefull. Thanks everyone for valuable suggestions.

BlackWolf said:

yep, that's something completly different. if you want to know about protocols, that is pretty easy. it's just a way to make sure a class implements some methods. in your example, the protocol does not have any necessary methods, but some optional ones like

actionSheet:clickedButtonAtIndex:

to see everything a protocol defines see the reference for that protocol, like
http://developer.apple.com/iphone/l...ctionSheetDelegate/UIActionSheetDelegate.html

Click to expand...