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Três conceitos que farão a diferença nos seus apps
• Networking e storage
• Diffing
• Navegação entre telas
MDPMy Design Pattern
Abstração
Offline ControllersFui usar o app em modo avião e olha no que deu
ViewController.swift
ViewController.swift
ViewController
ViewController
View Controller
Data Provider
Storage Controller API Client
API Client
View Controller
Data Provider
Storage Controller API Client
Storage Controller
View Controller
Data Provider
Storage Controller API Client
Data Provider
View Controller
Data Provider
Storage Controller API Client
HTTPJSON
SERVIDOR
APIREALM OBJECTS
REALM
HTTPJSON
SERVIDOR
APIREALM OBJECTS
REALM
HTTPJSON
SERVIDOR
APIREALM OBJECTS
REALM
SUBSCRIBE [USERS]
HTTPJSON
SERVIDOR
APIREALM OBJECTS
REALM
SUBSCRIBE [USERS]
HTTPJSON
SERVIDOR
APIREALM OBJECTS
REALM
SUBSCRIBE [USERS]
HTTPJSON
SERVIDOR
APIREALM OBJECTS
REALM
SUBSCRIBE [USERS]
HTTPJSON
SERVIDOR
APIREALM OBJECTS
REALM
SUBSCRIBE [USERS]
HTTPJSON
SERVIDOR
APIREALM OBJECTS
REALM
SUBSCRIBE [USERS]
HTTPJSON
SERVIDOR
APIREALM OBJECTS
REALM
SUBSCRIBE [USERS]
HTTPJSON
SERVIDOR
APIREALM OBJECTS
REALM
SUBSCRIBE [USERS]
HTTPJSON
SERVIDOR
APIREALM OBJECTS
REALM
SUBSCRIBE [USERS]
HTTPJSON
SERVIDOR
APIREALM OBJECTS
REALM
SUBSCRIBE [USERS]
HTTPJSON
SERVIDOR
APIREALM OBJECTS
REALM
SUBSCRIBE [USERS]
HTTPJSON
SERVIDOR
APIREALM OBJECTS
REALM
SUBSCRIBE [USERS]
HTTPJSON
SERVIDOR
APIREALM OBJECTS
REALM
SUBSCRIBE [USERS]
HTTPJSON
SERVIDOR
APIREALM OBJECTS
REALM
SUBSCRIBE [USERS]
HTTPJSON
SERVIDOR
APIREALM OBJECTS
REALM
SUBSCRIBE [USERS]
HTTPJSON
SERVIDOR
APIREALM OBJECTS
REALM
SUBSCRIBE [USERS]
HTTPJSON
SERVIDOR
APIREALM OBJECTS
REALM
SUBSCRIBE [USERS]
final class DataProvider { init(client: APIClient, storage: Storage) { self.client = client self.storage = storage } /// ... }
protocol APIClient { func searchUsers(query: String, completion: @escaping (Result<SearchResults<User>, APIError>) -> ()) func user(with login: String, completion: @escaping (Result<User, APIError>) -> ()) func repositories(by login: String, completion: @escaping (Result<[Repository], APIError>) -> ()) func repository(by login: String, named name: String, completion: @escaping (Result<Repository, APIError>) -> ()) func stargazers(for repositoryName: String, ownedBy login: String, completion: @escaping(Result<[User], APIError>) -> ()) }
protocol Storage: class { func store(users: [User], completion: ((StorageError?) -> ())?) func store(repositories: [Repository], completion: ((StorageError?) -> ())?) func searchUsers(with query: String) -> Observable<[User]> func user(withLogin login: String) -> Observable<User> func user(withId id: String) -> Observable<User> func repositories(by user: User) -> Observable<[Repository]> func repository(named name: String) -> Observable<Repository> func repository(withId id: String) -> Observable<Repository> func stargazers(for repository: Repository) -> Observable<[User]> }
DiffingCalculando diferenças entre coleções de models
struct Repository { let id: Int let name: String let owner: User let stars: Int }
id: 1 name: repoA owner: {insidegui} stars: 100
id: 2 name: repoB owner: {insidegui} stars: 200
let repositories: [Repository]
0
1
id: 1 name: repoA owner: {insidegui} stars: 102
id: 2 name: repoB owner: {insidegui} stars: 200
let repositories: [Repository]
0
1
id: 1 name: repoA owner: {insidegui} stars: 102
id: 2 name: repoB owner: {insidegui} stars: 200
difference = [.modified(0)]
0
1
id: 1 name: repoA owner: {insidegui} stars: 100
id: 2 name: repoB owner: {insidegui} stars: 200
0
1
id: 3 name: repoC owner: {insidegui} stars: 300
id: 2 name: repoB owner: {insidegui} stars: 200
let repositories: [Repository]
0
1
id: 3 name: repoC owner: {insidegui} stars: 300
id: 2 name: repoB owner: {insidegui} stars: 200
difference = [.deleted(0), .added(0)]
0
1
id: 1 name: repoA owner: {insidegui} stars: 102
id: 2 name: repoB owner: {insidegui} stars: 200
0
1
X
Levenshtein
let diff = IGListDiffPaths(0, 0, oldData, newData, .equality) tableView.beginUpdates() tableView.insertRows(at: diff.inserts, with: .automatic) tableView.deleteRows(at: diff.deletes, with: .automatic) tableView.reloadRows(at: diff.updates, with: .none) tableView.endUpdates()
extension UITableView { func reload(oldData: [IGListDiffable], newData: [IGListDiffable]) { let diff = IGListDiffPaths(0, 0, oldData, newData, .equality) beginUpdates() insertRows(at: diff.inserts, with: .automatic) deleteRows(at: diff.deletes, with: .automatic) reloadRows(at: diff.updates, with: .none) endUpdates() } }
RoutersConectando seus view controllers sem perder a sanidade
#comofas?
SEGUES
override func prepare(for segue: UIStoryboardSegue, sender: Any?) { if segue.identifier == "showRepositories" { if let vc = segue.destination as? RepositoriesViewController { vc.user = self.user } } }
init(provider: DataProvider, user: User, delegate: RepositoriesViewControllerDelegate)
Dependency Injection
final class AppRouter {
init(appLaunchOptions: [UIApplicationLaunchOptionsKey : Any]?)
func showInitialViewController()
func showRepositoriesViewController(for user: User)
func showStargazersViewController(for repository: Repository)
func showProfileViewController(for user: User, from presenting: UIViewController? = nil) }
AppRouter.swift
class AppDelegate: UIResponder, UIApplicationDelegate {
var router: AppRouter! func application(..., didFinishLaunching:...) -> Bool { router = AppRouter(appLaunchOptions: launchOptions) router.showInitialViewController() return true } }
func showInitialViewController() { if preferences.needsMigration { showMigrationViewController(with: "Migrating, please wait") storage.migrate(completion: showSearchViewController) } else { showSearchViewController() } }
extension AppRouter: UsersTableViewControllerDelegate { // ... }
extension AppRouter: RepositoriesTableViewControllerDelegate { // ... }
override func tableView(..., didSelectRowAt...) { delegate?.usersTableViewController(self, didSelect: ...) }
func usersTableViewController(_ controller: ..., didSelect user: User) { if controller is SearchUsersViewController { showRepositoriesViewController(for: user) } else if controller is StargazersViewController { showProfileViewController(for: user) } }
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