MVVM-ProtocolOriented

MVVMPlayground.swift

import UIKit

///////////////
// View Cell //
///////////////

protocol SwitchWithTextCellDataSource {
  var title: String { get }
  var switchOn: Bool { get }
}
protocol SwitchWithTextCellDelegate {
  func onSwitchToggleOn(on: Bool)
  
  var switchColor: UIColor { get }
  var textColor: UIColor { get }
  var font: UIFont { get }
}
extension SwitchWithTextCellDelegate {
  var switchColor: UIColor { return .purpleColor() }
  var textColor: UIColor { return .blackColor() }
  var font: UIFont { return .systemFontOfSize(17) }
}

class SwitchWithTextTableViewCell: UITableViewCell {
  @IBOutlet private weak var label: UILabel!
  @IBOutlet private var switchToggle: UISwitch!
  
  private var dataSource: SwitchWithTextCellDataSource?
  private var delegate: SwitchWithTextCellDelegate?
  
  override func awakeFromNib() {
    super.awakeFromNib()
  }
  
  func configure(withDataSource dataSource: SwitchWithTextCellDataSource, delegate: SwitchWithTextCellDelegate?) {
    self.dataSource = dataSource
    self.delegate = delegate
    
    label.text = dataSource.title
    switchToggle.on = dataSource.switchOn
    switchToggle.onTintColor = delegate?.switchColor
  }
  
  @IBAction func onSwitchToggle(sender: UISwitch) {
    delegate?.onSwitchToggleOn(sender.on)
  }
}

////////////////
// View Model //
////////////////

struct MinionModelViewModel: SwitchWithTextCellDataSource {
  var title = "Minion Mode!!!"
  var switchOn = true
}
extension MinionModelViewModel: SwitchWithTextCellDelegate {
  func onSwitchToggleOn(on: Bool) {
    if on {
      print("minions are here")
    } else { print("minions are out") }
  }
  var switchColor: UIColor { return .yellowColor() }
}

/////////////////////
// View Controller //
/////////////////////

class SettingsViewController: UITableViewController {
  enum Setting: Int { case MinionMode }
  
  override func viewDidLoad() {
    super.viewDidLoad()
  }
  
  override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return 1
  }
  
  override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    if let setting = Setting(rawValue: indexPath.row) {
      switch setting {
      case .MinionMode:
        let cell = tableView.dequeueReusableCellWithIdentifier("SwitchWithTextTableviewCell", forIndexPath: indexPath) as! SwitchWithTextTableViewCell
        
        let viewModel = MinionModelViewModel()
        cell.configure(withDataSource: viewModel, delegate: viewModel)
        return cell
      }
    }
    return tableView.dequeueReusableCellWithIdentifier("defaultCell", forIndexPath: indexPath)
  }
}