快速 TableView 将 reloadData 更改为 insertRows

Question

尝试更改方法来更新数据，因为 reloadData 有滞后

let oldIns = insertCounter
insertCounter += Int(INSERT_MESSAGES) // +40
var indexPaths = [IndexPath]()
for section in (oldIns..<insertCounter) {
    indexPaths.append(IndexPath(row: 2, section: section))
}
tableView.beginUpdates()
tableView.insertRows(at: indexPaths, with: .automatic)
tableView.endUpdates()

但我有错误

The number of sections contained in the table view after the update (80) must be equal to the number of sections contained in the table view before the update (40), plus or minus the number of sections inserted or deleted (0 inserted, 0 deleted)

func numberOfSections(in tableView: UITableView) -> Int {

    return min(insertCounter, Int(dbmessages.count))
}

    //---------------------------------------------------------------------------------------------------------------------------------------------
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

        return 5
    }

    //---------------------------------------------------------------------------------------------------------------------------------------------
    func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {

        return RCMessages().sectionHeaderMargin
    }

    //---------------------------------------------------------------------------------------------------------------------------------------------
    func tableView(_ tableView: UITableView, heightForFooterInSection section: Int) -> CGFloat {

        return RCMessages().sectionFooterMargin
    }

    //---------------------------------------------------------------------------------------------------------------------------------------------
    func tableView(_ tableView: UITableView, willDisplayHeaderView view: UIView, forSection section: Int) {

        view.tintColor = UIColor.clear
    }

    //---------------------------------------------------------------------------------------------------------------------------------------------
    func tableView(_ tableView: UITableView, willDisplayFooterView view: UIView, forSection section: Int) {

        view.tintColor = UIColor.clear
    }

    //---------------------------------------------------------------------------------------------------------------------------------------------
    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {

        if (indexPath.row == 0) {
            return RCSectionHeaderCell.height(indexPath, messagesView: self)
        }

        if (indexPath.row == 1) {
            return RCBubbleHeaderCell.height(indexPath, messagesView: self)
        }

        if (indexPath.row == 2) {

            let rcmessage = self.rcmessage(indexPath)
            if (rcmessage.type == RC_TYPE_STATUS)   { return RCStatusCell.height(indexPath, messagesView: self)             }
            if (rcmessage.type == RC_TYPE_TEXT)     { return RCTextMessageCell.height(indexPath, messagesView: self)        }

        }

        if (indexPath.row == 3) {
            return RCBubbleFooterCell.height(indexPath, messagesView: self)
        }

        if (indexPath.row == 4) {
            return RCSectionFooterCell.height(indexPath, messagesView: self)
        }
        return 0
    }

    //---------------------------------------------------------------------------------------------------------------------------------------------
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        if (indexPath.row == 0) {
            let cell = tableView.dequeueReusableCell(withIdentifier: "RCSectionHeaderCell", for: indexPath) as! RCSectionHeaderCell
            cell.bindData(indexPath, messagesView: self)
            return cell
        }

        if (indexPath.row == 1) {
            let cell = tableView.dequeueReusableCell(withIdentifier: "RCBubbleHeaderCell", for: indexPath) as! RCBubbleHeaderCell
            cell.bindData(indexPath, messagesView: self)
            return cell
        }

        if (indexPath.row == 2) {

            let rcmessage = self.rcmessage(indexPath)
            if (rcmessage.type == RC_TYPE_STATUS) {
                let cell = tableView.dequeueReusableCell(withIdentifier: "RCStatusCell", for: indexPath) as! RCStatusCell
                cell.bindData(indexPath, messagesView: self)
                return cell
            }

            if (rcmessage.type == RC_TYPE_TEXT) {
                let cell = tableView.dequeueReusableCell(withIdentifier: "RCTextMessageCell", for: indexPath) as! RCTextMessageCell
                cell.bindData(indexPath, messagesView: self)

                let numSections = self.tableView.numberOfSections
                if numSections == 1  {
                    updateTableContentInset()
                }
                return cell
            }

        }

        if (indexPath.row == 3) {
            let cell = tableView.dequeueReusableCell(withIdentifier: "RCBubbleFooterCell", for: indexPath) as! RCBubbleFooterCell
            cell.bindData(indexPath, messagesView: self)
            return cell
        }

        if (indexPath.row == 4) {
            let cell = tableView.dequeueReusableCell(withIdentifier: "RCSectionFooterCell", for: indexPath) as! RCSectionFooterCell
            cell.bindData(indexPath, messagesView: self)
            return cell
        }

        return UITableViewCell()
    }

如何正确在tableview中插入新行？以前是这样的

insertCounter += Int(INSERT_MESSAGES)
tableView.reloadData()

Answer 1

这是一个非常简单的代码行:

 tableView.insertRows(at: [IndexPath(row: 0, section: 0)], with: .top)

这将在 TableView 的顶部插入新行。然后您将重新加载数据。这应该可以解决问题。