How to make infinite scroll view in iPhone?

Question

I have a scrollview with 5 image views of width 88.

I want the scrollview to scroll to each image view (Not Paging)

and

I want to make an infinite scrollview in iPhone which means the when it scroll to last item it will display a first item next to it..

I have been trying by offset but it stops when move it by offset and also I have used apple street scroller which does not allow me to stop each element in center(just like Picker view)..

Answer 1

First of all, I recommend to use a UITableView so you can maintain the memory usage low. An approach that I had used successfully in a project is the following:

1. List item

Duplicate the content of your cells, I mean if you have 5 items in this way:

| 1 | 2 | 3 | 4 | 5 |

You should add the same (In a table view with reusable engine that's not a big deal) at the end of the table in order to look like this:

| 1 | 2 | 3 | 4 | 5 | 1 | 2 | 3 | 4 | 5 |

2. modify the scrollViewDidScroll with the following:

-(void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    if (scrollView == _yourScrollView) {
        CGFloat currentOffsetX = scrollView.contentOffset.x;
        CGFloat currentOffSetY = scrollView.contentOffset.y;
        CGFloat contentHeight = scrollView.contentSize.height;

        if (currentOffSetY < (contentHeight / 6.0f)) {
            scrollView.contentOffset = CGPointMake(currentOffsetX,(currentOffSetY + (contentHeight/2)));
        }
        if (currentOffSetY > ((contentHeight * 4)/ 6.0f)) {
            scrollView.contentOffset = CGPointMake(currentOffsetX,(currentOffSetY - (contentHeight/2)));
        }
    }
}

The code above move the scroll position at top if you almost reach the final of the scrolling; Or if you are almost on the top, moves you to the bottom...

3. That's it.