How to auto scroll UIScrollView using timer?

to get current value as w (x value) or h (y value) of content. This helps with manual/semi automatic scrolling with the current reference point in your content of your UIScollView.

CGFloat w = scroller.contentOffset.x;

or

CGFloat h = scroller.contentOffset.y;

then of course:

h += 100; // h-=100 for decrement
yourScrollView.contentOffset = CGPointMake(0, h);