How to populate custom header/footer view when using RxDatasources for datasource – Ios swift

I am using RxDatasources to create my datasource. Later on, I configure cells in my view controller. The thing is, cause headers/footers has nothing with datasource (except we can set a title, but if we use custom header footer, this title will be overriden).

Now, this is how I configure my tableview cells:

private func observeDatasource(){
    
    let dataSource = RxTableViewSectionedAnimatedDataSource<ConfigStatusSectionModel>(
        configureCell: { dataSource, tableView, indexPath, item in
            if let cell = tableView.dequeueReusableCell(withIdentifier: ConfigItemTableViewCell.identifier, for: indexPath) as? BaseTableViewCell{
                cell.setup(data: item.model)
                return cell
            }

            return UITableViewCell()
        })
    
    botConfigViewModel.sections
        .bind(to: tableView.rx.items(dataSource: dataSource))
        .disposed(by: disposeBag)  
}

now cause

dataSource.titleForHeaderInSection = { dataSource, index in
            return dataSource.sectionModels[index].model
}

… won’t work, cause I want to load a custom header and populate it with data from RxDatasource, I wonder what would be a proper way to:

• get data from my datasource which is defined in my view model
• populate header, based on a section (I have multiple sections) with correct data, in the way that is always up to date with a datasource.

Here is my view model:

 class ConfigViewModel{
        
        private let disposeBag = DisposeBag()
        let sections:BehaviorSubject<[ConfigStatusSectionModel]> = BehaviorSubject(value: [])
        
        func startObserving(){
            
            let observable = getDefaults()
            
            observable.map { conditions -> [ConfigStatusSectionModel] in
                return self.createDatasource(with: conditions)
            }.bind(to: self.sections).disposed(by: disposeBag)
        }
        
        private func getDefaults()->Observable<ConfigDefaultConditionsModel> {
            
            return Observable.create { observer in
                FirebaseManager.shared.getConfigDefaults { conditions in
                  
                    observer.onNext(conditions!)
    
                } failure: { error in
                    observer.onError(error!)
                }
                return Disposables.create()
            }
        }
        
        private func createDatasource(with defaults:ConfigDefaultConditionsModel)->[ConfigStatusSectionModel]{
            
        
            let firstSectionItems = defaults.start.elements.map{ConfigItemModel(item: $0, data: nil)}
            let firstSection = ConfigStatusSectionModel(model: defaults.start.title, items: firstSectionItems.compactMap{ConfigCellModel(model: $0)})
            
            let secondSectionItems = defaults.stop.elements.map{ConfigItemModel(item: $0, data: nil)}
            let secondSection = ConfigStatusSectionModel(model: defaults.stop.title, items: secondSectionItems.compactMap{ConfigCellModel(model: $0)})
            
            let sections:[ConfigStatusSectionModel] = [firstSection, secondSection]
            
            return sections
        }
    }

Now what I was able to do, is to set a tableview delegate, like this:

tableView.rx.setDelegate(self).disposed(by: disposeBag)

and then to implement appropriate delegate method(s) to create / return custom header:

extension BotConfigViewController: UITableViewDelegate {

    func tableView(_ tableView: UITableView,
                   viewForHeaderInSection section: Int) -> UIView? {
        guard let header = tableView.dequeueReusableHeaderFooterView(
                            withIdentifier: ConfigSectionTableViewHeader.identifier)
                            as? ConfigSectionTableViewHeader
        else {
            return nil
        }
        return header
    }

    func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return UITableView.automaticDimension
    }
    
    func tableView(_ tableView: UITableView, estimatedHeightForHeaderInSection section: Int) -> CGFloat {
        return 40
    }
  
}

How to populate my custom header with data from my datasource? I don’t want to do things like switch (section){...}, cause then its completely not in sync with a datasource, but rather manually, and if datasource changes, it won’t affect on header configuration automatically.

Here are my model structs:

typealias ConfigStatusSectionModel = AnimatableSectionModel<String, ConfigCellModel>

struct ConfigItemData {
    let conditionsLink:String?
    let iconPath:String?
}

struct ConfigItemModel {
    
    let item:OrderConditionModel
    let data:ConfigItemData?
}

struct ConfigCellModel : Equatable, IdentifiableType {
    
    static func == (lhs: ConfigCellModel, rhs: ConfigCellModel) -> Bool {
        
        return lhs.model.item.symbol == rhs.model.item.symbol
    }
    var identity: String {
        return model.item.symbol
    }
    let model: ConfigItemModel
}

I tried to use this but I wasn’t able to make it work completely, cause I guess I wasn’t providing custom header in a right way/moment.