The document describes refactoring a Twitter client app to follow the MVVM design pattern. Originally, the view controller handled fetching and displaying tweets directly. It was refactored to use a presenter class that fetches tweets and notifies the view controller when finished via a protocol. This decouples the data handling from the view controller and makes the code more testable.

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15. class ViewController: UIViewController {
@IBOutlet weak var tableView: UITableView!
var tweets: [Tweet] = []
override func viewDidLoad() {
super.viewDidLoad()
getTweets() { [unowned self] result in
switch result {
case .success(let tweets):
self.tweets = tweets
self.tableView.reloadData()
case .failure:
() //
}
}
}
}

16. class ViewController: UIViewController {
@IBOutlet weak var tableView: UITableView!
var tweets: [Tweet] = []
override func viewDidLoad() {
super.viewDidLoad()
getTweets() { [unowned self] result in
switch result {
case .success(let tweets):
self.tweets = tweets
self.tableView.reloadData()
case .failure:
() //
}
}
}
}
👊😤💢

22. protocol ViewControllerOutput: class {
func reloadTableView()
}
class ViewController: UIViewController {
@IBOutlet weak var tableView: UITableView!
var presenter: SomePresenter!
override func viewDidLoad() {
super.viewDidLoad()
presenter = SomePresenter(output: self)
presenter.getTweets()
}
}
extension ViewController: ViewControllerOutput {
func reloadTableView() {
tableView.reloadData()
}
}

23. protocol ViewControllerOutput: class {
func reloadTableView()
}
class ViewController: UIViewController {
@IBOutlet weak var tableView: UITableView!
var presenter: SomePresenter!
override func viewDidLoad() {
super.viewDidLoad()
presenter = SomePresenter(output: self)
presenter.getTweets()
}
}
extension ViewController: ViewControllerOutput {
func reloadTableView() {
tableView.reloadData()
}
}

24. protocol ViewControllerOutput: class {
func reloadTableView()
}
class ViewController: UIViewController {
@IBOutlet weak var tableView: UITableView!
var presenter: SomePresenter!
override func viewDidLoad() {
super.viewDidLoad()
presenter = SomePresenter(output: self)
presenter.getTweets()
}
}
extension ViewController: ViewControllerOutput {
func reloadTableView() {
tableView.reloadData()
}
}

25. class SomePresenter {
let output: ViewControllerOutput!
var tweets: [Tweet] = []
init(output: ViewControllerOutput) {
self.output = output
}
func getTweets() {
let twitterManager = TwitterManager()
twitterManager.fetchTimeline() { [unowned self] result in
switch result {
case .success(let tweets):
self.tweets = tweets
self.output.reloadTableView()
case .failure:
() //
}
}
}
}

26. class ViewController: UIViewController {
@IBOutlet weak var tableView: UITableView!
var presenter: SomePresenter!
override func viewDidLoad() {
super.viewDidLoad()
presenter = SomePresenter(output: self)
presenter.getTweets()
}
}
class ViewController: UIViewController {
@IBOutlet weak var tableView: UITableView!
var tweets: [Tweet] = []
override func viewDidLoad() {
super.viewDidLoad()
getTweets() { [unowned self] result in
switch result {
case .success(let tweets):
self.tweets = tweets
self.tableView.reloadData()
case .failure:
() //
}
}
}
}

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