RxSwift DisposeBag and UITableViewCell - ios

Question

I have a UITableViewCell, and it contain a UICollectionView.
I put data for collection view in dataSource's tableview.
class HomeTableViewCell: UITableViewCell {
var disposeBag = DisposeBag()
#IBOutlet weak var collectionItems: UICollectionView!
var listItem: PublishSubject<HomeResultModel> = PublishSubject<HomeResultModel>()
let dataSource = RxCollectionViewSectionedReloadDataSource<SectionOfMenuData>(configureCell: {(_, _, _, _) in
fatalError()
})
override func awakeFromNib() {
super.awakeFromNib()
setup()
setupBinding()
}
override func prepareForReuse() {
disposeBag = DisposeBag()
}
func setup() {
collectionItems.register(UINib(nibName: MenuCollectionViewCell.identifier, bundle: nil), forCellWithReuseIdentifier: MenuCollectionViewCell.identifier)
collectionItems.register(UINib(nibName: RecipeCollectionViewCell.identifier, bundle: nil), forCellWithReuseIdentifier: RecipeCollectionViewCell.identifier)
collectionItems.rx.setDelegate(self).disposed(by: disposeBag)
collectionItems.rx.modelAndIndexSelected(HomeListModel.self).subscribe { (model, index) in
if let recipesID = model.recipesID {
tlog(tag: self.TAG, sLog: "recipesID : \(recipesID)")
self.recipeIdSelected.onNext("\(recipesID)")
}
}.disposed(by: disposeBag)
dataSource.configureCell = { (dataSource, collectionView, indexPath, item) -> UICollectionViewCell in
let cellType = dataSource.sectionModels.first?.type ?? .recipeCell
if cellType == .menuCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: MenuCollectionViewCell.identifier, for: indexPath) as! MenuCollectionViewCell
cell.showInfo(item)
return cell
} else {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: RecipeCollectionViewCell.identifier, for: indexPath) as! RecipeCollectionViewCell
cell.showInfo(item.recipesName ?? "", imageLink: item.imageThumb ?? "")
return cell
}
}
}
func setupBinding() {
listItem.map { model -> [SectionOfMenuData] in
let modelID = try JSONEncoder().encode(model.id)
let modelResultID = String.init(data: modelID, encoding: .utf8)!
return [SectionOfMenuData(type: modelResultID == "0" ? .menuCell : .recipeCell, id: modelResultID, items: model.list)]
}.bind(to: collectionItems.rx.items(dataSource: dataSource))
.disposed(by: disposeBag)
}
}
I pass data for tableviewcell with code:
let dataSource = RxTableViewSectionedReloadDataSource<SectionOfHome> { dataSource, tableView, indexPath, item in
let cell = tableView.dequeueReusableCell(withIdentifier: HomeTableViewCell.identifier, for: indexPath) as! HomeTableViewCell
cell.listItem.onNext(item)
return cell
}
First show it ok, but when scroll tableview, I reset DisposeBag in:
func prepareForReuse{
disposeBag = DisposeBag()
}
and so tableview show blank.
How wrong was I in this regard?

Answer 1

Your subscription to listItems is getting disposed when the cell is reused and is never recreated. You should run the one-time tasks in awakeFromNib and move individual cell specific bindings to a function that you can call after resetting the disposeBag in prepareForReuse.