Slide 1
Slide 1 text
ϝϧΧϦΞοςͷ
RxSwift࣮ΨΠυ
Souzoh iOS Talk 2017 Oct 11
1
Slide 2
Slide 2 text
ࣗݾհ
• Ԭా༸ฏ(@parakeety)
• 2017 Jan 1ೖࣾ
• ϝϧΧϦ ΞοςͷiOSΞϓϦΛ։ൃ
2
Slide 3
Slide 3 text
ϝϧΧϦ Ξος
• ։ൃॳ͔ΒRxSwiftΛ࠾༻
• ৭ʑࢼߦࡨޡ͠ͳ͕Β࣮ํΛࡧ
• ࠷ۙେ͖ͳʹૺ۰͢Δࣄͳ͘ɺ͋Δఔํ͕ݻ·͖ͬͯͨ
3
Slide 4
Slide 4 text
RxSwiftΛ༻͍ͨ։ൃ
ϝϧΧϦ ΞοςͰ༻͍͍ͯΔ࣮ΨΠυͷҰ
෦Λհ
4
Slide 5
Slide 5 text
͓͠ͳ͕͖
1. ViewModelͷ࣮ΨΠυ
2. Error Handling
5
Slide 6
Slide 6 text
ϝϧΧϦ ΞοςͷΞʔΩςΫνϟ
• Model + View + ViewController + ViewModel
• ViewControllerΛεϦϜʹอͭͷͱɺςετ͢ΔͨΊʹ
ViewModelʹॲཧΛू
• ViewControllerViewModelͱ1ର1ͷؔ
6
Slide 7
Slide 7 text
1. ViewModel࣮ΨΠυ
private var viewModel: ViewModel!
private let refreshTrigger = PublishSubject() // view modelͷinput
override func viewDidLoad() {
super.viewDidLoad()
viewModel = ViewModel(refreshTrigger: refreshTrigger.asDriver())
}
7
1. ViewModelͷinputViewModelͷinitializerͰશͯ͢
Slide 8
Slide 8 text
1. ViewModel࣮ΨΠυ
class ViewModel {
let offers: Driver<[Offer]> // view model͔Βͷoutput
init(refreshTrigger: Driver) {
offers = refreshTrigger.flatMap { _ in
return APIClient.shared.responseFrom(SomeRequest)
}
}
}
8
2. ViewModel͔ΒͷoutputViewModelͷpropertyͱͯ͠ఆٛ
Slide 9
Slide 9 text
1. ViewModel࣮ΨΠυ
override func viewDidLoad() {
super.viewDidLoad()
viewModel = ViewModel(refreshTrigger: refreshTrigger.asDriver())
viewModel.offers
.drive()
.disposed(by: disposeBag)
}
9
Slide 10
Slide 10 text
1. ViewModel࣮ΨΠυ
3. ViewModelͷinputoutputDriverΛ͏
- observableʹ͕ྲྀΕͯ͘Δͷ͕ઌ͔ɺsubscribe͕ઌ͔Ͱҙਤ͠ͳ͍ಈ
࡞͕ൃੜ͢Δ͜ͱ͕͋ͬͨ(subscribe͔ͯ͠Β͕ྲྀΕͯ͘ΕΛड͚
औΕΔ͕ɺ͕ྲྀΕ͖ͯͨޙʹsubscribeͯ͠Λड͚औΕͳ͍)
- subscribeͷλΠϛϯάॱ൪Λؾʹ͠ͳͯ͘ྑ͍Α͏ʹɺsubscribe͠
ͨ࣌ʹreplayͤ͞ΔΑ͏ʹͨ͠
10
Slide 11
Slide 11 text
1. ViewModel࣮ΨΠυ
1. ViewModelͷinputViewModelͷinitializerͰશͯ͢
2. ViewModel͔ΒͷoutputViewModelͷpropertyͱͯ͠ఆٛ͢Δ
3. ViewModelͷinputoutputDriverΛ͏
11
·ͱΊ
Slide 12
Slide 12 text
2. Error Handling
αʔόʔʹϦΫΤετΛ͛ͯɺΤϥʔ͕ฦ͖ͬͯͨ
࣌ʹɺϢʔβʔʹΤϥʔϝοηʔδΛද͍ࣔͨ͠
12
Slide 13
Slide 13 text
2. Error Handling
observableʹerror͕ྲྀΕΔͱobservable͕ऴྃͯ͠͠
·͏
=> ͏Ұsubscribe͠͞ͳ͍ͱ͍͚ͳ͍
13
Slide 14
Slide 14 text
2. Error Handling
ਖ਼ৗܥͱΤϥʔͷstreamΛ͢Δ
14
Slide 15
Slide 15 text
2. Error Handling
enum Result {
case succeeded(Response)
case failed(Error)
}
extension ObservableConvertibleType {
func resultDriver() -> Driver> {
return self.asObservable()
.map { Result.succeeded($0) }
.asDriver { Driver.just(Result.failed($0)) }
}
}
15
Slide 16
Slide 16 text
2. Errorͷऔѻ͍
extension SharedSequence {
static func split(result: Driver>) -> (response: Driver, error: Driver) {
let responseDriver = result.flatMap { result -> Driver in
switch result {
case .succeeded(let response):
return Driver.just(response)
case .failed:
return Driver.empty()
}
}
let errorDriver = result.flatMap { result -> Driver in
switch result {
case .succeeded:
return Driver.empty()
case .failed(let error):
return Driver.just(error)
}
}
return (responseDriver, errorDriver)
}
}
16
Slide 17
Slide 17 text
2. Errorͷऔѻ͍
let responseDriver = result.flatMap { result -> Driver in
switch result {
case .succeeded(let response):
return Driver.just(response)
case .failed:
return Driver.empty()
}
}
17
Slide 18
Slide 18 text
2. Errorͷऔѻ͍
let errorDriver = result.flatMap { result -> Driver in
switch result {
case .succeeded:
return Driver.empty()
case .failed(let error):
return Driver.just(error)
}
}
18
Slide 19
Slide 19 text
2. Errorͷऔѻ͍
extension SharedSequence {
static func split(result: Driver>) -> (response: Driver, error: Driver) {
let responseDriver = result.flatMap { result -> Driver in
switch result {
case .succeeded(let response):
return Driver.just(response)
case .failed:
return Driver.empty()
}
}
let errorDriver = result.flatMap { result -> Driver in
switch result {
case .succeeded:
return Driver.empty()
case .failed(let error):
return Driver.just(error)
}
}
return (responseDriver, errorDriver)
}
}
19
Slide 20
Slide 20 text
2. Errorͷऔѻ͍
class ViewModel {
let offers: Driver<[Offer]>
let error: Driver
init(refreshTrigger: Driver) {
let offerResult: Driver> = refreshTrigger
.flatMap { _ in
return APIClient.shared.responseFrom(OfferRequest)
.resultDriver()
}
(offers, error) = Driver.split(result: offerResult)
}
}
20
͏ଆ(ViewModel)
Slide 21
Slide 21 text
2. Errorͷऔѻ͍
class ViewController: UIViewController {
private var viewModel: ViewModel!
private let refreshTrigger = PublishSubject()
private let disposeBag = DisposeBag()
override func viewDidLoad() {
super.viewDidLoad()
viewModel = ViewModel(refreshTrigger: refreshTrigger)
viewModel.offers
.drive()
.disposed(by: disposeBag)
viewModel.error
.drive() // handle error i.e) show alert
.disposed(by: disposeBag)
}
}
21
͏ଆ(ViewController)
Slide 22
Slide 22 text
͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠
22