How to disable automatic scrolling to top - ios

Question

How can I disable auto scroll to the top of table view when I append new data to data source of it.
The problem is visible in the following gif.
Edit: Added ViewController, ViewModel and MessageEntity.
Used frameworks are: RxSwift, RxDataSources for reactive datasource of table view.
ViewController:
class RabbitMqVC: BaseViewController {
struct Cells {
static let message = ReusableCell<MessageCell>(nibName: "MessageCell")
static let messageTheir = ReusableCell<MessageCellTheir>(nibName: "MessageCellTheir")
}
#IBOutlet
weak var tableView: UITableView!{
didSet{
rabbitMqViewModel.sections
.drive(tableView.rx.items(dataSource: dataSource))
.addDisposableTo(disposeBag)
}
}
private let dataSource = RxTableViewSectionedAnimatedDataSource<RabbitMqViewModel.MessageSections>()
private let rabbitMqViewModel : rabbitMqViewModel
init(rabbitMqViewModel: rabbitMqViewModel) {
self.rabbitMqViewModel = rabbitMqViewModel
super.init(nibName: "RabbitMqVC", bundle: nil)
dataSource.configureCell = { _, tableView, indexPath, item in
let randomNumber = 1.random(to: 2)
let cell = randomNumber == 1 ? tableView.dequeue(Cells.message, for: indexPath) : tableView.dequeue(Cells.messageTheir, for: indexPath)
cell.message = item
return cell
}
}
override func viewDidLoad() {
super.viewDidLoad()
tableView.register(Cells.message)
tableView.register(Cells.messageTheir)
tableView.rowHeight = UITableViewAutomaticDimension
tableView.estimatedRowHeight = 80
}
}
ViewModel:
class RabbitMqViewModel: ViewModel {
enum MessageSections: AnimatableSectionModelType {
typealias Item = MessageEntity
typealias Identity = Int
case messages(messages: [MessageEntity])
var items: [Item] {
switch self {
case .messages(messages:let messages):
return messages
}
}
var identity: Int {
return 1
}
init(original: MessageSections, items: [Item]) {
switch original {
case .messages:
self = .messages(messages: items)
}
}
}
// input
let didLoad = PublishSubject<Void>()
//output
let sections: Driver<[MessageSections]>
init(service: RabbitMqService,){
let messages: Observable<[MessageEntity]> = didLoad
.flatMapLatest { _ -> Observable<[MessageEntity]> in
return service.listenMessages()
}
.share()
self.sections = messages
.map { (messages) -> [RabbitMqViewModel.MessageSections] in
var sections: [MessageSections] = []
sections.append(.messages(messages: messages))
return sections
}
.asDriver(onErrorJustReturn: [])
}
}
MessageEntity:
struct MessageEntity {
let id: String
let conversationId: String
let messageText: String
let sent: Date
let isSentByClient: Bool
let senderName: String
let commodityClientId : Int?
}
extension MessageEntity: IdentifiableType, Equatable {
typealias Identity = Int
public var identity: Identity {
return id.hashValue
}
public static func ==(lhs: MessageEntity, rhs: MessageEntity) -> Bool {
return lhs.id == rhs.id
}
}

Answer 1

estimatedRowHeight = 1
Fixed it.