Provide IGListCollectionSectionController [inception]

[rnystrom]

Create a stock horizontal or vertical scrolling item controller. This is a pretty loaded RFC b/c the API would have to be really thought out. Some questions come to mind:

Subclassing?

Since the infra requires subclassing IGListItemController and conforming to IGListItemType, if we provide a new item controller for this it would have to follow the same pattern as the stacked or single item controller:

@interface IGListCollectionItemController : IGListItemController <IGListItemType>
@end

Question is: do we have clients subclass this object or do we stick SUBCLASSING_RESTRICTED on it and provide some hooks?

Another idea is that we don't conform to IGListItemType but add hooks to properly setup/configure/reload the embedded item controller.

UICollectionView config

• Should we have an enum for h/v scrolling?
• What layout object would we use?
  • Maybe we keep the stock version of this to using UICollectionViewFlowLayout

I'm sure there will be more questions that come up. Open to suggestions.

[jessesquires]

To clarify a bit:

What we want to achieve is to have multiple sections with horizontal scrolling that together scroll vertical. Essentially, a ListKit version of https://github.com/ashfurrow/AFTabledCollectionView. So IGListCollectionSectionController would be a section that contains a (horizontally scrolling) collection view.

Correct, @rnystrom ? (At least, that's part of this proposal)

[zhubofei]

@rnystrom IGListItemControllerwas renamed to IGListSectionController right?

[jessesquires]

@zhubofei - correct 😄 We should update the initial comment

[rnystrom]

Noting from #133 that we want to store and reset the content offset of the collection view when it is reused.

[jessesquires]

@rnystrom - can this be deferred from 3.0 to a later release?

[rnystrom]

@jessesquires we could sneak it in, honestly, now that #517 and #503 are under wraps. Probably ok to punt tho since there's enough documentation right now.

[jessesquires]

@rnystrom - Cool let's push this to 3.1.0

[tunidev]

any news about that

[jessesquires]

Clearing the milestone here since this seems like it's still in the pretty early stages of design, etc

[Ziewvater]

There isn't much call for something like this internally, so we're not going to invest effort in building it out.