ReactiveKit/Bond: Observable2DArray sample

TableViewController.swift

//
//  TableViewController.swift
//
//  Created by Shin Morichika on 2016/09/28.
//  Copyright © 2016年 covered. All rights reserved.
//

import UIKit
import Bond

class TableViewController: UITableViewController {

    let viewModel = ViewModel.sharedInstance

    override func viewDidLoad() {
        super.viewDidLoad()
        
        tableView.register(UITableViewCell.self, forCellReuseIdentifier: "Cell")

        viewModel.array
            .bind(to: tableView, using: MyBond())
            .disposeIn(bnd_bag)

        navigationItem.leftBarButtonItem = UIBarButtonItem(
            barButtonSystemItem: .add,
            target: self,
            action: #selector(addItem)
        )
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
    
    func addItem() {
        viewModel.addItem()
    }

}

class MyBond: TableViewBond {

    typealias DataSource = Observable2DArray<SectionMetadata, City>

    let viewModel = ViewModel.sharedInstance
    
    func cellForRow(at indexPath: IndexPath, tableView: UITableView, dataSource: DataSource) -> UITableViewCell {
        let city = viewModel.array[indexPath]
        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
        cell.textLabel?.text = city.name
 
        return cell
    }
    
    func titleForHeader(in section: Int, dataSource: DataSource) -> String? {
        return dataSource[section].metadata.header
    }

}

ViewModel.swift

//  ViewModel.swift
//
//  Created by Shin Morichika on 2016/09/28.
//  Copyright © 2016年 covered. All rights reserved.
//

import Foundation
import Bond

typealias SectionMetadata = (header: String, footer: String)

struct City {
    let name: String
}

struct ViewModel {

    let array = MutableObservable2DArray(
        [
            Observable2DArraySection<SectionMetadata, City>(
                metadata: (header: "Cities", footer: "That's it"),
                items: [
                    City(name: "Paris"),
                    City(name: "Berlin"),
                ]
            )
        ]
    )
    
    func addItem() {
        array.appendItem(City(name: "Rome"), toSection: 0)
    }
    
    static var sharedInstance : ViewModel {
        struct Static {
            static let instance : ViewModel = ViewModel()
        }
        return Static.instance
    }

}