CODEWITHSUNDEEP
iglistkit
Monty
Monty

Reputation: 331

cellForItem or sizeForItem not called

I am trying out IGListKit for the first time but i seem to have hit a brick wall early on

lazy var collectionView: UICollectionView = {
    let collectionView = UICollectionView(frame: .zero, collectionViewLayout: UICollectionViewFlowLayout())
    collectionView.backgroundColor = .white
    return collectionView
}()

override func viewDidLoad() {
    super.viewDidLoad()

    self.view.addSubview(self.collectionView)

    let updater = ListAdapterUpdater()
    let adapter = ListAdapter(updater: updater, viewController: self, workingRangeSize: 0)
    adapter.collectionView = self.collectionView

    adapter.dataSource = self
}

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    collectionView.frame = view.bounds
}

And

extension SocialViewController: ListAdapterDataSource {

func objects(for listAdapter: ListAdapter) -> [ListDiffable] {
    // this can be anything!
    return [ "Foo" as ListDiffable, "Bar" as ListDiffable]
}

func listAdapter(_ listAdapter: ListAdapter, sectionControllerFor object: Any) -> ListSectionController {
    return TopNewsSectionController()
}

func emptyView(for listAdapter: ListAdapter) -> UIView? {
    return UIImageView(image: UIImage(named: "swords"))
}

}

class TopNewsSectionController: ListSectionController {

override func sizeForItem(at index: Int) -> CGSize {
    return CGSize(width: collectionContext!.containerSize.width, height: 55)
}

override func cellForItem(at index: Int) -> UICollectionViewCell {
    return collectionContext!.dequeueReusableCell(of: TopNewsCollectionViewCell.self, for: self, at: index)
}

}

but my neither cellForItem or sizeForItem is being called what am i doing wrong?

Upvotes: 1

Views: 1124

Answers (3)

Mathieu G.
Mathieu G.

Reputation: 1

Your adapter object is destroyed when viewDidLoad returns. Try to declare it as a property of your ViewController.

Upvotes: 0

Jason K
Jason K

Reputation: 138

Try to declare adapter as a class property rather than a method property,

    let updater = ListAdapterUpdater()
    let adapter = ListAdapter(updater: updater, viewController: self, workingRangeSize: 0)
    adapter.collectionView = self.collectionView

to 

    lazy var adapter: ListAdapter = {
        return ListAdapter(updater: ListAdapterUpdater(), viewController: self, workingRangeSize: 0)
    }()

Upvotes: 1

Nea Cao
Nea Cao

Reputation: 1

Call adapter.performUpdatesAnimated or adapter.reloadDataWithCompletion (for the first time loading) to update

Upvotes: 0

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