20220716_만들면서 느껴보는 POP
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let us: Go! 2022 summer https://github.com/iamchiwon/TheToDo
![Protocol Oriented Programming
If someone is oriented towards or oriented to a particular thing or
person, they are mainly concerned with that thing or person.
oriented
[ ɔːrientɪd ]
ADJECTIVE](https://image.slidesharecdn.com/20220716pop-220714181728-870953af/85/20220716_-POP-5-320.jpg)
![ToDoServiceImpl
class ToDoServiceImpl: ToDoService {
private var todoItems: [ToDo] = []
func create(title: String) {
let todo = ToDo(id: UUID().uuidString,
title: title,
done: false,
createdAt: Date())
todoItems.append(todo)
}
func count()
-
>
Int {
return todoItems.count
}
func item(at index: Int)
-
>
ToDo {
return todoItems[index]
}
}
extension ToDoServiceImpl : Toggable {
func toggle(withId id: String) {
if let found = todoItems.enumerated()
.first(where: { $0.element.id
=
=
id }) {
let index = found.offset
var todo = found.element
todo.done = !todo.done
todoItems[index] = todo
}
}
}](https://image.slidesharecdn.com/20220716pop-220714181728-870953af/85/20220716_-POP-20-320.jpg)
![ToDoServiceImpl
class ToDoServiceImpl: ToDoService {
private let repository: Repository
init(repository: Repository) {
self.repository = repository
todoItems = repository.load()
}
deinit {
repository.save(todos: todoItems)
}
.
.
.
}
Repository
protocol Repository {
func load()
-
>
[ToDo]
func save(todos: [ToDo])
}](https://image.slidesharecdn.com/20220716pop-220714181728-870953af/85/20220716_-POP-23-320.jpg)
![UserDefaultRepository
class UserDefaultRepository: Repository {
private let TodoKey = "todos"
func load()
-
>
[ToDo] {
guard let json = UserDefaults.standard.string(forKey: TodoKey),
let data = json.data(using: .utf8) else {
return []
}
return (try? JSONDecoder().decode([ToDo].self, from: data))
?
?
[]
}
func save(todos: [ToDo]) {
guard let data = try? JSONEncoder().encode(todos),
let json = String(data: data, encoding: .utf8) else {
return
}
UserDefaults.standard.set(json, forKey: TodoKey)
}
}](https://image.slidesharecdn.com/20220716pop-220714181728-870953af/85/20220716_-POP-24-320.jpg)
20220716_만들면서 느껴보는 POP
- 1. 송치원 (곰튀김) iamchiwon.github.io 만들면서 느껴보는 POP Realism Programmer Protocol Oriented Programming
- 2. 내일 배포 전에 메뉴 기능 하나 없애 주세요
- 3. 내일 완공 전에 화장실 하나 없애 주세요 내일 배포 전에 메뉴 기능 하나 없애 주세요 VS Hardware Software
- 4. Software 답게 만들기 쉽게 변경할 수 있게 만들기
- 5. Protocol Oriented Programming If someone is oriented towards or oriented to a particular thing or person, they are mainly concerned with that thing or person. oriented [ ɔːrientɪd ] ADJECTIVE
- 9. Delegate 만들기 protocol JsonFetcherDelegate : AnyObject { func onFetched(json: String) } class JsonFetcher { weak var delegate: JsonFetcherDelegate? func fetch(url: String) { guard let url = URL(string: url) else { return } DispatchQueue.global(qos: .background).async { if let data = try? Data(contentsOf: url), let json = String(data: data, encoding: .utf8) { self.delegate ? . onFetched(json: json) } } } } class Main { var fetcher : JsonFetcher { let o = JsonFetcher() o.delegate = self return o } func main() { fetcher.fetch(url: " . . . ") } } extension Main : JsonFetcherDelegate { func onFetched(json: String) { print(json) } }
- 10. 구현 강제하기 protocol JsonFetcherDelegate : AnyObject { func onFetched(json: String) } class JsonFetcher { weak var delegate: JsonFetcherDelegate? func fetch(url: String) { guard let url = URL(string: url) else { return } DispatchQueue.global(qos: .background).async { if let data = try? Data(contentsOf: url), let json = String(data: data, encoding: .utf8) { self.delegate ? . onFetched(json: json) } } } } class Main : JsonFetcherDelegate { var fetcher : JsonFetcher { let o = JsonFetcher() o.delegate = self return o } func main() { fetcher.fetch(url: " . . . ") } }
- 11. 기본구현 넣기 protocol TypePresentable { func typeName() - > String } extension TypePresentable { func typeName() - > String { "(type(of: self))" } } extension Int : TypePresentable {} extension String : TypePresentable {} print(42.typeName()) / / Int print("Hello World".typeName()) / / String struct MyStruct : TypePresentable {} print(MyStruct().typeName()) / / MyStruct
- 12. 추상화 하기 protocol Repository { func save(data: Data) func load() - > Data? } class MemRepository : Repository { private var data: Data? func save(data: Data) { self.data = data } func load() - > Data? { return data } } class FileRepository : Repository { private var filePath: URL? func save(data: Data) { try! data.write(to: filePath!) } func load() - > Data? { return try? Data(contentsOf: filePath!) } } Repository MemRepository FileRepository
- 13. 느슨한 결합 protocol Repository { func save(data: Data) func load() - > Data? } class MemRepository : Repository { private var data: Data? func save(data: Data) { self.data = data } func load() - > Data? { return data } } class ViewModel { private let repository: Repository init(repository: Repository) { self.repository = repository } } let viewModel = ViewModel(repository: MemRepository()) ViewModel Repository MemRepository
- 14. Q. 다음 중 올바르지 않은 것은? protocol A { func a() - > Int } protocol B { func b<T: Numeric>() - > T } protocol C<T: Numeric> { func c() - > T } protocol D { associatedtype T: Numeric func d() - > T } 1⃣ 2⃣ 3⃣ 4⃣
- 15. 만들면서 느껴보기 1. 있다 치고 2. 알게 뭐야
- 16. TodoViewController class ToDoViewController: UITableViewController { let service: ToDoService @IBAction func onCreateToDo(title: String) { / / TODO: create TODO tableView.reloadData() } } extension ToDoViewController { override func tableView(tableView:numberOfRowsInSection:) - > Int { / / TODO: get TODOs count } override func tableView(tableView:,cellForRowAt:) - > UITableViewCell { … let index = indexPath.row let item = / / TODO: get TODO cell.todo = item return cell } } TodoService protocol ToDoService { }
- 17. TodoViewController class ToDoViewController: UITableViewController { let service: ToDoService @IBAction func onCreateToDo(title: String) { service.create(title: title) tableView.reloadData() } } extension ToDoViewController { override func tableView(tableView:numberOfRowsInSection:) - > Int { service.count() } override func tableView(tableView:,cellForRowAt:) - > UITableViewCell { … let index = indexPath.row let item = service.item(at: index) cell.todo = item return cell } } TodoService protocol ToDoService { func create(title: String) func count() - > Int func item(at: Int) - > ToDo }
- 18. ToDoItemTableViewCell class ToDoItemTableViewCell: UITableViewCell { @IBOutlet var isDone: UISwitch! @IBOutlet var itemTitle: UILabel! @IBOutlet var updatedAt: UILabel! var toggable: Toggable? @IBAction func onToggle() { / / TODO: toggle done } } Toggable protocol Toggable { }
- 19. ToDoItemTableViewCell class ToDoItemTableViewCell: UITableViewCell { @IBOutlet var isDone: UISwitch! @IBOutlet var itemTitle: UILabel! @IBOutlet var updatedAt: UILabel! var toggable: Toggable? @IBAction func onToggle() { toggable ? . toggle(withId: todo.id) } } Toggable protocol Toggable { func toggle(withId id: String) }
- 20. ToDoServiceImpl class ToDoServiceImpl: ToDoService { private var todoItems: [ToDo] = [] func create(title: String) { let todo = ToDo(id: UUID().uuidString, title: title, done: false, createdAt: Date()) todoItems.append(todo) } func count() - > Int { return todoItems.count } func item(at index: Int) - > ToDo { return todoItems[index] } } extension ToDoServiceImpl : Toggable { func toggle(withId id: String) { if let found = todoItems.enumerated() .first(where: { $0.element.id = = id }) { let index = found.offset var todo = found.element todo.done = !todo.done todoItems[index] = todo } } }
- 21. TodoViewController typealias ToDoToggableService = ToDoService & Toggable class ToDoViewController: UITableViewController { let service: ToDoToggableService @IBAction func onCreateToDo(title: String) { service.create(title: title) tableView.reloadData() } } extension ToDoViewController { override func tableView(tableView:numberOfRowsInSection:) - > Int { service.count() } override func tableView(tableView:,cellForRowAt:) - > UITableViewCell { … let index = indexPath.row let item = service.item(at: index) cell.todo = item cell.toggable = service return cell } }
- 22. ToDoServiceImpl class ToDoServiceImpl: ToDoService { private let repository: Repository init(repository: Repository) { self.repository = repository / / TODO: load todos } deinit { / / TODO: save todos } . . . } Repository protocol Repository { }
- 23. ToDoServiceImpl class ToDoServiceImpl: ToDoService { private let repository: Repository init(repository: Repository) { self.repository = repository todoItems = repository.load() } deinit { repository.save(todos: todoItems) } . . . } Repository protocol Repository { func load() - > [ToDo] func save(todos: [ToDo]) }
- 24. UserDefaultRepository class UserDefaultRepository: Repository { private let TodoKey = "todos" func load() - > [ToDo] { guard let json = UserDefaults.standard.string(forKey: TodoKey), let data = json.data(using: .utf8) else { return [] } return (try? JSONDecoder().decode([ToDo].self, from: data)) ? ? [] } func save(todos: [ToDo]) { guard let data = try? JSONEncoder().encode(todos), let json = String(data: data, encoding: .utf8) else { return } UserDefaults.standard.set(json, forKey: TodoKey) } }
- 25. Codable struct ToDo: Identifiable, Codable { let id: String let title: String var done: Bool let createdAt: Date } public protocol Decodable { init(from decoder: Decoder) throws } public protocol Encodable { func encode(to encoder: Encoder) throws } public typealias Codable = Decodable & Encodable
- 27. Dependency Injection class AppDelegate: UIResponder, UIApplicationDelegate { let container = Container() func application(application:,didFinishLaunchingWithOptions:) - > Bool { container.register(Repository.self) { _ in UserDefaultRepository() } container.register(ToDoToggableService.self) { c in let repository = c.resolve(Repository.self)! return ToDoServiceImpl(repository: repository) } return true } } func Inject<Service>(_ serviceType: Service.Type) - > Service? { (UIApplication.shared.delegate as? AppDelegate) ? . container.resolve(serviceType) } class ToDoListViewController: UITableViewController { let service: ToDoToggableService = Inject(ToDoToggableService.self)! . . . } https: / / github.com/Swinject/Swinject
- 28. Q. 다음 중 올바르지 않은 것은? protocol P {} protocol PROTOCOL {} extension PROTOCOL: P {} protocol C {} class CLASS {} extension CLASS: C {} protocol S {} struct STRUCT {} extension STRUCT: S {} protocol E {} enum ENUM {} extension ENUM: E {} 1⃣ 2⃣ 3⃣ 4⃣
- 29. 🤔 OOP 에서는 Protocol 의 역할이 많구나! 😏 그렇다면 Protocol을 더 적극적으로 써보자 🧐 class, struct, enum 전부 다 Protocol 적용하게 하자! 😠 Protocol이 진짜 중요해졌네!!! 😎 그렇다면 이제부터 Protocol을 중심으로 코딩해 🤩 그걸 Protocol Oriented Programming 이라고 하자 의식의 흐름
- 30. Summary 1. Protocol 로 할 수 있는 것들 == Protocol을 사용해서 얻는 이점 •Delegate •구현 강제 •추상화 •느슨한 결합 ➡ 유연한 확장 2. 구현 과정에서 구현체 보다 Protocol 을 우선해서 생각하자 3. POP == Protocol을 적극 활용하는 OOP Oriented Programming