UITableViewのDataSourceをprotocolで定義しておく 2 ref: http://qiita.com/morizotter/items/6785b5aefaa6ebe67e7c

file0.swift

protocol TableViewSectionType {
    typealias Row
    var rows: [Row] { get set }
}

extension TableViewSectionType {
    func title() -> String? {
        return nil
    }

    func headerViewIdentifier() -> String? {
        return nil
    }
}

protocol TableViewDataSourceType {
    typealias Section: TableViewSectionType
    var sections: [Section] { get set }
}

file1.swift

enum SettingsCellType {
    case Colors
    case License
    case InAppPurchase
    case Restore
    case Version
}

struct SettingItem {
    let title: String?
    let subTitle: String?
    let cellType: SettingsCellType

    init(title: String?, subTitle: String?, cellType: SettingsCellType) {
        self.title = title
        self.subTitle = subTitle
        self.cellType = cellType
    }
}

struct SettingsSection<T>: TableViewSectionType {
    var rows: [T]
    var title: String?

    init(rows: [T], title: String?) {
        self.rows = rows
        self.title = title
    }
}

struct SettingsDataSource<T: TableViewSectionType>: TableViewDataSourceType {
    var sections: [T]
    init(sections: [T]) {
        self.sections = sections
    }
}

file2.txt

var dataSource: SettingsDataSource<SettingsSection<SettingItem>>!

override func viewDidLoad() {
    super.viewDidLoad()

    dataSource = SettingsDataSource<SettingsSection<SettingItem>>(sections: [
        SettingsSection<SettingItem>(rows: [
            SettingItem(title: "Colors", subTitle: nil, cellType: .Colors)
            ], title: "General"),
        SettingsSection<SettingItem>(rows: [
            SettingItem(title: "InAppPurchase", subTitle: nil, cellType: .InAppPurchase),
            SettingItem(title: "Restore", subTitle: nil, cellType: .Restore)
            ], title: "Purchase"),
        SettingsSection<SettingItem>(rows: [
            SettingItem(title: "License", subTitle: nil, cellType: .License),
            SettingItem(title: "Version", subTitle: nil, cellType: .Version)
            ], title: "Application")
        ])
}

file3.txt

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return dataSource.sections[section].rows.count
}

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let row = dataSource.sections[indexPath.section].rows[indexPath.row]
    switch row.cellType {
    case .Colors:
        let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath)
        cell.textLabel?.text = row.title
        cell.detailTextLabel?.text = row.subTitle
        cell.accessoryType = .DisclosureIndicator
        return cell
    case .InAppPurchase:
        // Return cell
    case .Restore:
        // Return cell
    case .License:
        // Return cell
    case .Version:
        // Return cell
    }
}

file4.txt

override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    let row = dataSource.sections[indexPath.section].rows[indexPath.row]
    switch row.cellType {
    case .Colors:
        // Do something
    case .InAppPurchase:
        // Do something
    case .Restore:
        // Do something
    case .License:
        // Do something
    case .Version:
        // Do something
    }
}

UIViewController

final class SettingsViewController: UITableViewController {

    var dataSource: SettingsDataSource<SettingsSection<SettingItem>>!

    override func viewDidLoad() {
        super.viewDidLoad()

        dataSource = SettingsDataSource<SettingsSection<SettingItem>>(sections: [
            SettingsSection<SettingItem>(rows: [
                SettingItem(title: "Colors", subTitle: nil, cellType: .Colors)
                ], title: "General"),
            SettingsSection<SettingItem>(rows: [
                SettingItem(title: "InAppPurchase", subTitle: nil, cellType: .InAppPurchase),
                SettingItem(title: "Restore", subTitle: nil, cellType: .Restore)
                ], title: "Purchase"),
            SettingsSection<SettingItem>(rows: [
                SettingItem(title: "License", subTitle: nil, cellType: .License),
                SettingItem(title: "Version", subTitle: nil, cellType: .Version)
                ], title: "Application")
            ])
    }

...

// MARK: UITableViewDataSource
extension SettingsViewController {
    override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return dataSource.sections.count
    }

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return dataSource.sections[section].rows.count
    }

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let row = dataSource.sections[indexPath.section].rows[indexPath.row]
        switch row.cellType {
        case .Colors:
            let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath)
            cell.textLabel?.text = row.title
            cell.detailTextLabel?.text = row.subTitle
            cell.accessoryType = .DisclosureIndicator
            return cell
        case .InAppPurchase:
            // Return cell
        case .Restore:
            // Return cell
        case .License:
            // Return cell
        case .Version:
            // Return cell
        }
    }
}

...

// MARK: UITableViewDelegate
extension SettingsViewController {
    override func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        return dataSource.sections[section].title
    }

    override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        let row = dataSource.sections[indexPath.section].rows[indexPath.row]
        switch row.cellType {
        case .Colors:
            // Do something
        case .InAppPurchase:
            // Do something
        case .Restore:
            // Do something
        case .License:
            // Do something
        case .Version:
            // Do something
        }
    }
}