IOS How to get a UIScrollView scrolling and paging

The secret to understanding the scroll view is that it has a frame size and a content size. You only need to create the frame size big enough to fit the view whereas the content size will be larger in order for it to scroll.
Here is code that can be placed in the viewDidLoad of your ViewController.m file, and incorporates paging as well. It assumes that you have already created a UIScrollView in Interface Builder and called it scrollView:

// Adjust scroll view content size, set background colour and turn on paging

    scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * 12,   
    scrollView.frame.size.height);
    scrollView.pagingEnabled=YES;
    scrollView.backgroundColor = [UIColor blackColor];

     // Generate content for our scroll view using the frame height and width as the reference point

    int i = 0;
    while (i < 12) {

        UIView *views = [[UIView alloc]
        initWithFrame:CGRectMake(((scrollView.frame.size.width)*i)+20, 10,
        (scrollView.frame.size.width)-40, scrollView.frame.size.height-20)];
        views.backgroundColor=[UIColor yellowColor];
        [views setTag:i];
        [scrollView addSubview:views];

        i++;
    }