안드로이드 개발자를 위한 스위프트

let swift(16)

안드로이드�개발자를�위한�스위프트Swift & VIPER

osxdev.org / todait유병한

저는…

유병한�

현재�투데잇에서�iOS�개발을�담당(하고�있지만�사실은�Android�개발자�🙈🙉)�

이제는�iOS�개발자가�되고픔

아니�Android�개발자가�왜�iOS�개발을...?

회사에�iOS�개발자가�없어서...😭

Agenda

Swift를�사용하면서�Java에�비해�좋았던�부분(중요한�부분만�빠르게�알아봐요!)�

VIPER�아키텍처�적용�사례

let swift(16)

Android�개발을�하면서�아쉬웠던�부분

Java ☕

Null�Pointer�Exception�

Getter�/�Setter�

Anonymous�Class�

복잡한�계산로직을�자유자재로,�가독성이�좋게�짜기�힘듦

Activity (== ViewController)

너무나�많은�역할을�하는�Activity�

View,�Life�Cycle,�Navigation,�Networking,�DB,�Business�Logic,�…�

어떤�코드가�어디에�있는지�찾기�힘듦(==�뭣이�중헌지�모름)�

이러한�구조로는�테스트도�불가능

빚이되어�돌아오리…💸

Dirty�&�Fast�

모든�것이�빚으로�돌아옴�

버그라던지.�

버그라던지..�

버그라던지...

인간의욕심은끝이없고

같은실수를반복한다

같은�실수를�반복하지�말자!�🤔

let swift(16)

Swift

Swift

Optional Type

Property

Closure & Functional

Protocol & Extension

Java,�넘나�위험한�것!�⚠

Optional Type

Optional�Type이란?

타입�선언�시�변수에�nil이�저장될�수�있는지�여부를�명시

var nonOptional: Int = 0 nonOptional = nil // Compile Error!

var optional: Int? = 0 optional = nil // OK!

Optional Chaining

let viewController = UIViewController() print(viewController.navigationItem.backBarButtonItem?.title?.characters.count)

print(viewController.navigationItem.backBarButtonItem?.title ?? "Title")

Optional Binding - if let

if let viewController = viewController as? UITableViewController { viewController.tableView.reloadData() }


if let viewController = viewController as? UITableViewController, refreshControl = viewController.refreshControl { refreshControl.beginRefreshing() }


if let viewController = viewController as? UITableViewController, refreshControl = viewController.refreshControl where refreshControl.refreshing { refreshControl.beginRefreshing() }

Optional Binding - guard let

func signUp1(email: String?) { guard let email = email else { return } print(email.characters.count) }


func signUp(email: String?, password: String?) { guard let email = email, password = password else { return } print("\(email) / \(password)") }


func signUp(email: String?, password: String?) { guard let email = email, password = password where 8 <= password.characters.count else { return } print("\(email) / \(password)") }

Optional Binding - switch

let passwordText: String? = ""

switch(passwordText) { case .Some(let password) where 8 <= password.characters.count: print(password) case .Some: print("8자리�이상�입력해주세요") case .None: print("password is nil") }

이제는�안녕�Getter,�Setter�🙋

Property

Stored Property

struct Box { let width: Double let height: Double let depth: Double }

Stored Propertystruct Box { var width: Double { willSet { print("newValue: \(newValue)") } didSet { print("oldValue: \(oldValue)") volume = width * height * depth } } var height: Double { ... } var depth: Double { ... } var volume: Double }

Computed Property

struct Box { var width: Double var height: Double var depth: Double var volume: Double { get { return width * height * depth } set { print("newValue: \(newValue)") } } }

Computed Property

struct Box { var width: Double var height: Double var depth: Double var volume: Double { return width * height * depth } }

for,�if의�늪에서�나를�구해줘요!�😱

Closure & Functional

객체로서의�함수

함수의�인자로�함수를�넘길�수�있음�

함수의�결과로�함수를�반환할�수�있음

Closure�사용과�타입�추론

Closure는�이름이�없는�함수

var sum = [1, 23, 4, 32].reduce(0, combine: { (sum: Int, element: Int) -> Int in return sum + element })


타입이�명확한�경우�생략�가능

extension SequenceType { /// Returns the result of repeatedly calling `combine` with an /// accumulated value initialized to `initial` and each element of /// `self`, in turn, i.e. return /// `combine(combine(...combine(combine(initial, self[0]), /// self[1]),...self[count-2]), self[count-1])`. @warn_unused_result public func reduce<T>(initial: T, @noescape combine: (T, Self.Generator.Element) throws -> T) rethrows -> T }

var sum = [1, 23, 4, 32].reduce(0, combine: { (sum: Int, element: Int) -> Int in return sum + element })


sum = [1, 23, 4, 32].reduce(0, combine: { sum, element in return sum + element })

sum = [1, 23, 4, 32].reduce(0, combine: { return $0 + $1 })

sum = [1, 23, 4, 32].reduce(0, combine: { $0 + $1 })

sum = [1, 23, 4, 32].reduce(0) { $0 + $1 }

sum = [1, 23, 4, 32].reduce(0, combine: +)

투데잇에서의�Functional

통계�계산�로직에서�적극적으로�사용�

대용량�데이터를�다루는�것이�아닌�유저�한사람의�데이터�그�중에서도�특정�날짜의�데이터를�주로�다룸�

스레드�처리만�잘�해주면�사용자�체감�상�크게�문제될�상황은�없음�

퍼포먼스도�물론�중요하지만�오류�없고,�가독성이�높고,�수정이�용이한�코드가�필요�

map,�flatMap,�filter,�reduce,�contains�...

Protocol & Extension

Property&Method Requirements

Property�&�Method�에�대한�명세

protocol Flyable { var distance: Int { get set } func fly() }

struct SwiftBird: Flyable { var distance: Int func fly() { print("flying!") } }

Protocol with an Extension

Protocol은�Property를�가질�수�없지만�Method는�가질�수�있음

protocol ViewControllerProtocol: class { var loadingView: LoadingView { get set } }

extension ViewControllerProtocol where Self: UIViewController { func showLoadingView() { loadingView.showLoadingView(self) } func dismissLoadingView() { loadingView.dismissView() } }

let swift(16)

VIPER

좋은�Architecture는?

Distribution�

Testability�

Ease�of�Use

VIPER�구성요소

View Presenter

Router

Interactor Entity

DataService

Todait의�VIPER�구성요소

View Presenter

Router

Interactor

Entity

ViewModel

DataService

DataServiceView Presenter

Router

Interactor

Entity

ViewModel

DataService

View

UIViewController에�해당�

View�Life�Cycleex)�viewDidLoad�함수가�호출되었음을�Presenter에�알림�

View�Eventex)�signUpButton이�클릭되었음을�Presenter에�알림�

View�Controlex)�titleLabel의�텍스트를�바꾸는�방법을�Presenter에�제공