Swift TableView Contents Disappear and Flash When Reloaded-CodePudding

I'm building a chat app with a table view of various channels that people can chat on.

If a new message (channel) comes in, I update my data store, and then reload the table view. In this particular instance, if a user accepts an invite to a channel; that channel gets added to the data store.

Every time a new channel gets added, this method gets called:

 @objc func processChannels() {
        if self.airlockStore.unPinnedChannelDataObjects.isEmpty == true {
            return
        } else {
            let pinnedSection = self.tableViewAdaptor!.sections[0] as! TableViewAdaptorSection<ChannelTableViewCell, ChannelDataObject>
            let unPinnedSection = self.tableViewAdaptor!.sections[1] as! TableViewAdaptorSection<ChannelTableViewCell, ChannelDataObject>
            unPinnedSection.items = airlockStore.unPinnedChannelDataObjects
            pinnedSection.items = airlockStore.pinnedChannelDataObjects
        }
        updateTableView()
    }

And subsequently, this one gets called:

  @objc func updateTableView() {
        tableViewAdaptor?.tableView.isUserInteractionEnabled = true
        tableViewAdaptor?.tableView.reloadData()
    }

However, I consistently get a flash / the contents of the table view temporarily disappear before then being displayed in the manner expected.

Have read several posts regarding flashes when loading a table view, but haven't been able to solve this yet.

I was looking at reloading individual rows in the table view, but the problem is; there's no guarantee of where the index in my list of channels a new channel will be added to.

CodePudding user response：

Have you tried not reloading after every update of tableview?

On the other hand, it may not be important but why you set isUserInteractionEnabled = true so many times.

CodePudding user response：

Use this before and after adding/deleting row in table view:

tableview.beginupdates() 

// adding/deleting row 

tableview.endupdates()