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RxSwift
Observable ͷ࡞Γํ
USAMI Kosuke
(Fenrir Inc.)
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RxSwift 3 released
» For Swift 3
» ಛʹɺ໋໊ϧʔϧ͕େ෯ʹมΘ͍ͬͯΔ
» Swift 2 ܥͰ RxSwift 2 ܥΛ͏
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RxSwift ͓͞Β͍
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Observable ͱ
» ҎԼͷ3छྨͷͷ͕ྲྀΕͯ͘ΔඇಉظετϦʔϜ
» .next(Element)
» .error(Error)ʢετϦʔϜऴྃʣ
» .completedʢετϦʔϜऴྃʣ
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Observable Λ͏ : جຊܗ
hogeObservable
.subscribe(onNext: { element in
print(element)
})
.addDisposableTo(disposeBag)
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Observable Λ͏ : Operator
hogeObservable
.catchError { ... }
.filter { ... }
.map { ... }
...
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ΑΓৄ͘͠ҎԼ͕Φεεϝ
» Rx.playground
» RxExample.xcodeproj
» RxSwift ϦϙδτϦʹ͋Δ
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༻ҙ͞Ε͍ͯΔ Observable
» UI ύʔπͷ Observable ͍͍ͩͨ༻ҙ͞Ε͍ͯΔ
» UIButton.rx.tap
» UITextField.rx.text
» UILabel.rx.text
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୯७ʹΠϕϯτΛྲྀ͢ Observable
let variable = Variable("1")
variable.value = "2"
variable.value = "3"
let subject = PublishSubject()
subject.onNext("A")
subject.onNext("B")
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ͦΕҎ֎ͷ Observable ʁ
» ඞཁʹԠͯࣗ͡Ͱ༻ҙ͢Δ
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Observable Λ࡞Δ
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Observable.create()
let hoge = Observable.create { observer in
observer.on(.next("hoge"))
observer.on(.completed)
return Disposables.create()
}
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ϙΠϯτ (1) ΤϥʔΛૹΖ͏
» Observable ͷྑ͞Λੜ͔͢
» ޭ࣌ʹ݁Ռ͚ͩʢnextʣɺࣦഊ࣌ʹΤϥʔ͚ͩʢerrorʣ
» ݁ՌͱΤϥʔ͕྆ํฦΔ͜ͱͳ͍ͱ͍͏อূ
» ΤϥʔΛࣺͯΔͷ Observer ଆͷࣄ
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ϙΠϯτ (1) ΤϥʔΛૹΖ͏
let hoge = Observable.create { [unowned self] observer in
do {
let result = try self.hogehoge()
observer.on(.next(result))
observer.on(.completed)
} catch let error {
observer.on(.error(error))
}
return Disposables.create()
}
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ϙΠϯτ (2) ΩϟϯηϧՄೳʹ͠Α͏
» Observable ͷࢹʢsubscribeʣΛΊΔʢdisposeʣ߹ͷରॲ
» dispose ͞Εͨ࣌ͷΩϟϯηϧॲཧ Observable ଆͷࣄ
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ϙΠϯτ (2) ΩϟϯηϧՄೳʹ͠Α͏
let hoge = Observable.create { [unowned self] observer in
let task = self.dataTaskWithRequest(request) { ... }
task.resume()
return Disposables.create {
task.cancel() // dispose ࣌ʹ͕࣮͜͜ߦ͞ΕΔ
}
}
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Ԡ༻ : ΩϟϯηϧϙΠϯτΛ࡞Δ
let hoge = Observable.create { [unowned self] observer in
self.scheduler.schedule(()) { _ in
hogeTask1()
// ͜͜ͰΩϟϯηϧͰ͖ΔΑ͏ʹ͍ͨ͠
hogeTask2()
}
return Disposables.create { ??? }
}
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Ԡ༻ : ΩϟϯηϧϙΠϯτΛ࡞Δ
let hoge = Observable.create { [unowned self] observer in
let cancelDisposable = BooleanDisposable()
let disposable = self.scheduler.schedule(()) { _ in
hogeTask1()
if cancelDisposable.disposed == true { return }
hogeTask2()
}
return CompositeDisposable(disposable, cancelDisposable)
}
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Observable Λ࡞Δʹ
» Ҏ্ͷ͜ͱΛԡ͓͚͍͍͑ͯ͞Μ͡Όͳ͍Ͱ͠ΐ͏͔
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Observable Λ࡞Δͱ
» Non Rx ͳੈքΛ Rx ͳੈքʹ͢Δ
» Observable ͕࡞ΕΔͱɺͳΜͰ Rx ʹͰ͖Δ