How to message superview in Objective C

I am new to Objective C and Cocoa. I just don't get it how to message the superview of an UIView. I can't get it work. Here is what i tried so far:

In my MainView i have a method named resetDrawType:

- (void) resetDrawType {
   self.drawType = foo;
}

Also in the MainView i create a subview and add it to MainView:

mySubView *mySubView = [[mySubView alloc] initWithFrame:CGRectMake(foo, foo, foo, foo)];
[self addSubview:mySubView];
[mySubView release];

Then when the subview finished its drawing i want to send the message resetDrawType to its superview, which is the MainView.

I tried this

 [(MainView*)[self superview] resetDrawType];

and

 [(MainView*)self.superview resetDrawType];

…what didn't work. I learned about Informal Protocols so i added this code to MainView.h

 @interface NSObject ( resetters )
    - (void) resetDrawType;
 @end

But still nothing. Next i found out about this selector thing and tried this in the subview:

 if ([self.superview respondsToSelector:@selector(resetDrawType:)])
    [self.superview performSelector:@selector(resetDrawType) withObject:nil];

It also didn't work. What am I doing wrong? Thanks for your help.