Using different datasources with the same UITableView

UITableViewWithSwitchableDatasources.swift

//: Playground - noun: a place where people can play

import UIKit
import XCPlayground

//: Protocols
protocol TableViewDisplayable {
    var title:String {get set}
}

protocol DataProvider {
    associatedtype Data : TableViewDisplayable
    var data: [Data] { get set }
    static func dummyData() -> [Data]
}

extension DataProvider {
    
    func numberOfRows() -> Int {
        return self.data.count;
    }
}

//: Models
class SportsPerson: TableViewDisplayable {
    var title:String
    
    init(name:String) {
        self.title = name
    }
}

class MovieStar: TableViewDisplayable {
    var title:String
    
    init(name:String) {
        self.title = name
    }
}

//: Datasources
class SportsDatasource : NSObject, DataProvider, UITableViewDataSource {

    typealias Data = SportsPerson
    var data: [Data]

    override init() {
        self.data = SportsDatasource.dummyData()
    }
    static func dummyData() -> [Data] {
        return  [
                 SportsPerson(name: "Christiani Ronaldo"),
                 SportsPerson(name: "Michael Jordon"),
                 SportsPerson(name: "Clayton Kershaw"),
                 SportsPerson(name: "Tiger Woods"),
                 SportsPerson(name: "Roger Federrer"),
                 SportsPerson(name: "Sachin Tendulkar"),
                 SportsPerson(name: "Lewis Hamilton"),
                ]
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return self.numberOfRows()
    }
    
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as UITableViewCell
        cell.accessoryType = .detailButton
        let data = self.data[indexPath.row]
        
        cell.textLabel?.text = data.title
        return cell
        
    }

}

class MovieStarsDatasource :NSObject, DataProvider, UITableViewDataSource {
    
    typealias Data = MovieStar
    
    var data: [Data]
    
    override init() {
        self.data = MovieStarsDatasource.dummyData()
    }
    
    static func dummyData() -> [Data] {
        return  [
                MovieStar(name: "Leonardo DiCaprio"),
                MovieStar(name: "Will Smith"),
                MovieStar(name: "Johny Depp"),
                MovieStar(name: "Christian Bale"),
                MovieStar(name: "Ben Affleck"),
                MovieStar(name: "Robert Downey, Jr"),
                MovieStar(name: "Leonardo DiCaprio")
                ]
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return self.numberOfRows()
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as UITableViewCell
        cell.accessoryType = .disclosureIndicator
        let data = self.data[indexPath.row]
        
        cell.textLabel?.text = data.title
        return cell
        
    }
}



class ViewController: UIViewController {
    
    var tableView: UITableView!
    
    // Switch between datasources here ...
    
    var datasource = MovieStarsDatasource()
//    var datasource = MySportPersonDataSource()
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.frame = CGRect(x: 0, y: 0, width: 320, height: 480)
        self.tableView = UITableView(frame:self.view.frame)
        self.tableView!.dataSource = datasource
        self.tableView.register(UITableViewCell.self, forCellReuseIdentifier: "cell")
        self.view.addSubview(self.tableView)
        
    }
}

var ctrl = ViewController()
XCPShowView(identifier: "Playground VC", view: ctrl.view)