iOS Table View with Section

// 1.
override func numberOfSections(in tableView: UITableView) -> Int {
        return 3
}

// 2.
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        switch section {
        case 0:
            return self.dailyTasks.count
        case 1:
            return self.weeklyTasks.count
        case 2:
            return self.monthlyTasks.count
        default:
            return 0
        }
}

// 3.
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        // let cell = UITableViewCell()
        let cell = tableView.dequeueReusableCell(withIdentifier: "normalcell")!

        switch indexPath.section {
        case 0:
            cell.textLabel?.text = self.dailyTasks[indexPath.row]
        case 1:
            cell.textLabel?.text = self.weeklyTasks[indexPath.row]
        case 2:
            cell.textLabel?.text = self.monthlyTasks[indexPath.row]
        default:
            cell.textLabel?.text = "No data"
        }
        return cell
    }

// 4.
override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        switch section {
        case 0:
            return "Daily Tasks"
        case 1:
            return "Weekly Tasks"
        case 2:
            return "Monthly Tasks"
        default:
            return nil
        }
    }

// 5.
Storyboard -> (Table View) change style from plain to grouped