IFTTTAnimatedPagingScrollViewController: Delegate or callback on page scroll?

[huguesbr]

Any really simple way to get a callback when specific page is shown?

If not trivial do you think it make sense to add it on

- (void)animateCurrentFrame {
    [super animateCurrentFrame];
    if(floorf(self.pageOffset) == self.pageOffset) {
      // did scroll to page self.pageOffset
    }
}

should it be implemented directly in the lib as a method to subclass or even a delegate?

what do you think?