Question

-(void) alertView: ( UIAlertView *) alertView 
         clickedButtonAtIndex: ( NSInteger ) buttonIndex {
      // do stuff
      // if you want the alert to close, just call [ alertView release ]   
}

Can someone explain this method? I’m used to methods that are like “-(IBAction)buttonPress:(id)sender” but this one has three. What do each of those mean?

MethodName : ReturnedType : InputType
is this right?

Answer 1

It’s actually:

-(return type) methodName:(param1 type)param1 moreMethodName:(param2 type)param2

Etc, with as many parameters as you want. So that method is called alertView:clickedButtonAtIndex: — it just has its parameters embedded. It’s the equivalent, in a more “normal” language, of alertViewClickedButtonAtIndex(UIAlertView *alertView, NSInteger buttonIndex)

For a pretty good primer on Obj-C syntax, check out:
http://www.cocoadevcentral.com/d/learn_objectivec/

For info on that particular method, check out this document.