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RxSwiftͷεέδϡʔϥ
USAMI Kosuke
Fenrir Inc.
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RxSwift
• ඇಉظΠϕϯτΛड͚औΔͨΊͷΈ
• UI Πϕϯτड͚औΓ
• Web API Ϩεϙϯεड͚औΓ
• σʔλͷมԽͷࢹ
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ྫ
hogeObservable
.subscribe(onNext: { _ in
// ΠϕϯτΛड͚औͬͨͱ͖ͷॲཧ
})
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ඇಉظΠϕϯτͱεϨου
• ඇಉظΠϕϯτʹಉظతͰͳ͍ʹผεϨουͰൃੜ͢Δ
• Rx ͰεϨουͲͷΑ͏ʹѻΘΕΔͷ͔ʁ
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εέδϡʔϥ
• Rx ͰεϨουʹͨΔ֓೦
• ʢਖ਼֬ʹεϨουͱ1ର1Ͱͳ͍͚Ͳɺ͜͜Ͱলུʣ
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༨ஊɿRx ͷࡾཁૉ
• Observable
• Operator
• Scheduler
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εέδϡʔϥ
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Observable ͱ Observer
• ΠϕϯτൃੜݩͱΠϕϯτॲཧ
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Scheduler
• ͦΕͧΕʹεέδϡʔϥΛࢦఆͰ͖Δ
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observeOn
• ΠϕϯτॲཧͷεέδϡʔϥΛม͑Δ
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ྫ
hogeObservable
.observeOn(MainScheduler.instance)
.subscribe(onNext: { _ in
// ϝΠϯεϨουͰಈ࡞͢Δ
})
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subscribeOn
• ΠϕϯτൃੜݩͷεέδϡʔϥΛม͑Δ
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ྫ
hogeObservable
.subscribeOn(hogeScheduler)
.do(onNext: { _ in
// hogeScheduler Ͱಈ࡞͢Δ
}
.observeOn(MainScheduler.instance)
.subscribe(onNext: { _ in
// ϝΠϯεϨουͰಈ࡞͢Δ
})
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εϨου੍ޚ·ͱΊ
• subscribeOn : Πϕϯτൃੜݩͷεέδϡʔϥࢦఆ
• Web API ࣮ߦεϨουͷࢦఆ
• σʔλϕʔεΞΫηεεϨουͷࢦఆ
• observeOn : Πϕϯτॲཧͷεέδϡʔϥͷࢦఆ
• UI ॲཧεϨουͷࢦఆ
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ҙ
• subscribeOn ͰΓସ͑Ͱ͖ͳ͍߹͕͋Δ
• ͦΕ Observable ͷੑ࣭ʹΑΔ
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Hot ͱ Cold
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subscribeOn ͕ޮ͔ͳ͍߹
• Hot ͳ Observable ͷ߹Γସ͑Ͱ͖ͳ͍
• Cold ͳ Observable ͷ߹Γସ͑Ͱ͖Δ
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ྫɿΓସ͑Ͱ͖ͳ͍έʔε
let hogeRelay = BehaviorRelay(value: "A")
let hogeThread = Thread() {
sleep(1)
hogeRelay.accept("B")
sleep(1)
hogeRelay.accept("C")
}
hogeThread.start()
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ྫɿΓସ͑Ͱ͖ͳ͍έʔε
hogeRelay
.subscribeOn(MainScheduler.instance)
.do(onNext: { _ in
// hogeThread Ͱ accept ͨ͠ͷ hogeThread Ͱಈ࡞
}
.observeOn(MainScheduler.instance)
.subscribe(onNext: { _ in
// ϝΠϯεϨουͰಈ࡞͢Δ
})
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Observable ͷྨ : Hot / Cold
• Hot
• subscribe ͠ͳͯ͘ετϦʔϜ͕ྲྀΕΔ
• subscribeOn Ͱ੍ޚͰ͖ͳ͍
• Cold
• subscribe ͨ͠ΒετϦʔϜ͕ྲྀΕग़͢
• subscribeOn Ͱ੍ޚͰ͖Δ
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ͲΕ͕ Hot ͰͲΕ͕ Cold ͔ʁ
• Hot
• Subject Relay
• Rx ͷ֎ଆ͔ΒετϦʔϜʹΠϕϯτΛૹΕΔ
• Cold
• ্هҎ֎͍͍ͩͨ Cold
• Rx ͷ੍ޚԼʹ͋Δ
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·ͱΊ
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·ͱΊ
• εέδϡʔϥ
• Γସ͑Δํ๏
• Hot ͱ Cold
• Hot Γସ͑Ͱ͖ͳ͍