There’s a WWDC video from 2011 : “Advanced ScrollView Techniques” which
explains one way to do infinite scrolling. Look at 18:08 if it is what you want.
On 07/10/2013, at 13:21, Dave <d...@looktowindward.com> wrote:
> Hi,
>
> I'd like to be able to Scroll Infinitely in a Scroll, e.g. when the scrolling
> is past the last item in the Scroll start displaying the first and when
> scrolling before the first item, starting displaying the last. The items in
> this case are UIImageViews and they have a fixed height and a variable width
> and no one image will be wider that the Scroll View itself. Also it needs to
> work with pagingEnables = NO, e.g. there will be more than one Image visible.
>
> I've playing around a bit and found a some sample code that sort of does it
> but it doesn't handle the wrapping the Images smoothly (is was written to
> have paging enabled).
>
> My plan was/is to detect when the scrolling had hit before the first/after
> the last and to move the first Subview to the End or the Last one to the
> beginning, depending on the direction of movement, but at the moment, I can't
> seem to see a way of detecting these conditions.
>
> I logged contentOffset and contentSize in the scrollViewDidScroll delegate
> method and got these results:
>
>
> scrollViewDidScroll Offset: {4017, 0} - Size: {5119, 200}
> scrollViewDidScroll Offset: {4061, 0} - Size: {5119, 200}
> scrollViewDidScroll Offset: {4095, 0} - Size: {5119, 200}
>
> When hitting the end and
>
> scrollViewDidScroll Top Scroll View Offset: {106, 0} - Size: {5119, 200}
> scrollViewDidScroll Top Scroll View Offset: {24, 0} - Size: {5119, 200}
> scrollViewDidScroll Top Scroll View Offset: {-0, 0} - Size: {5119, 200}
>
> When hitting the start.
>
> I'm not sure how if I can detect the start/end conditions using these values?
>
> Any points on the best way to implement this would greatly appreciated!
>
> All the Best
> Dave
>
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