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RxSwift 시작하기
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Suyeol Jeon
October 27, 2017
Programming
1
350
RxSwift 시작하기
https://www.slideshare.net/devxoul/rxswift-81314827
Suyeol Jeon
October 27, 2017
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Transcript
RxSwift दೞӝ ࣻৌ (github.com/devxoul)
ࣻৌ • StyleShare Inc. • SW Maestro 2ӝ • RxSwift
RxSwift?
RxSwift = ReactiveX + Swift
RxSwift = ReactiveX + Swift
RxSwift = ReactiveX + Swift ?
RxSwift = ReactiveX + Swift Re + ActiveX
None
ইש
RxSwift = ReactiveX + Swift Reactive + Extension
RxSwift = ReactiveX + Swift ߈ഋ ۽Ӓې߁ਸ ೡ ࣻ ѱ
೧ח ഛಂ
RxSwift = ReactiveX + Swift ߈ഋ ۽Ӓې߁ਸ ೡ ࣻ ѱ
೧ח ഛಂ ?
a = 10 b = a * 2
a = 10 b = a * 2 print(b)
a = 10 b = a * 2 print(b) //
20
a = 10 b = a * 2 print(b) //
20 a = 30
a = 10 b = a * 2 print(b) //
20 a = 30 print(b)
a = 10 b = a * 2 print(b) //
20 a = 30 print(b) // 20
a = 10 b = a * 2 print(b) //
20 a = 30 print(b) // 20 60
߈ഋ ۽Ӓې߁ਸ ਤ೧ ReactiveXо ࢎਊೞח بҳ Observer Pattern Iterator Pattern
Functional Programming
߈ഋ ۽Ӓې߁ਸ ਤ೧ ReactiveXо ࢎਊೞח بҳ Observer Pattern Iterator Pattern
Functional Programming
Observable Observer
Observable Observer observe
Observable Observer observe notify
Observable Observer Observer Observer
߈ഋ ۽Ӓې߁ਸ ਤ೧ ReactiveXо ࢎਊೞח بҳ Observer Pattern Iterator Pattern
Functional Programming
Iterator next() hasNext()
Iterator next() hasNext() 10 20 30 40
Iterator next() hasNext() 10 20 30 40
Iterator next() hasNext() 10 20 30 40 iterator.next()
Iterator next() hasNext() 10 20 30 40 iterator.next() // 10
Iterator next() hasNext() 10 20 30 40
Iterator next() hasNext() 10 20 30 40 iterator.next()
Iterator next() hasNext() 10 20 30 40 iterator.next() // 20
Iterator next() hasNext() 10 20 30 40
Iterator next() hasNext() 10 20 30 40 iterator.next()
Iterator next() hasNext() 10 20 30 40 iterator.next() // 30
Iterator next() hasNext() 10 20 30 40
Iterator next() hasNext() 10 20 30 40 iterator.next()
Iterator next() hasNext() 10 20 30 40 iterator.next() // 40
Iterator next() hasNext() 10 20 30 40
Iterator next() hasNext() 10 20 30 40 iterator.hasNext() // false
߈ഋ ۽Ӓې߁ਸ ਤ೧ ReactiveXо ࢎਊೞח بҳ Observer Pattern Iterator Pattern
Functional Programming
• ࣻ ೣࣻ ઑਵ۽ ۽Ӓ۔ ҳࢿ • ࢚కܳ ߄Բ ঋҊ,
ࠛ߸ ܐഋ ࢎਊ ೣࣻഋ ۽Ӓې߁
• Ҋର ೣࣻ • ࣽࣻ ೣࣻ • ... ೣࣻഋ ۽Ӓې߁
higher-order fuction pure fuction
• Ҋର ೣࣻ • ࣽࣻ ೣࣻ • ... ೣࣻഋ ۽Ӓې߁
higher-order fuction pure fuction
Ҋର ೣࣻ 1. ೣࣻܳ ܲ ೣࣻ ۄఠ۽ ׳ 2. ೣࣻܳ
ܲ ೣࣻীࢲ Ѿҗ۽ ߈ജ
var array = [2, 6, 3, 1, 7] array.sort(by: {
a, b in return a < b })
var array = [2, 6, 3, 1, 7] array.sort(by: {
a, b in return a < b })
var array = [2, 6, 3, 1, 7] array.sort(by: {
a, b in return a < b })
• Ҋର ೣࣻ • ࣽࣻ ೣࣻ • ... ೣࣻഋ ۽Ӓې߁
higher-order fuction pure fuction
ࣽࣻ ೣࣻ • ࠗਊਸ ߊࢤदః ঋח ೣࣻ • ଵઑ ైݺࢿ
ח ೣࣻ
ࣽࣻ ೣࣻ • ࠗਊਸ ߊࢤदః ঋח ೣࣻ • ଵઑ ైݺࢿ
ח ೣࣻ ೣࣻ झܳ ߩযաࢲ ߄Ӵ ࣁ࢚ী ߸ചܳ оೞח ೯ز (࢚క ߸҃, ֎ਕఊ, I/O ١)
ࣽࣻ ೣࣻ • ࠗਊਸ ߊࢤदః ঋח ೣࣻ • ଵઑ ైݺࢿ
ח ೣࣻ ੑ۱ زੌೞݶ ۱ب ೦࢚ زੌ
var rate = 1130 func krw(usd: Int) -> Int {
return usd * rate }
var rate = 1130 func krw(usd: Int) -> Int {
return usd * rate } krw(usd: 2) // 2260 krw(usd: 3) // 3390
var rate = 1130 func krw(usd: Int) -> Int {
return usd * rate } rate = 1140 krw(usd: 2) // 2260 krw(usd: 3) // 3390
var rate = 1130 func krw(usd: Int) -> Int {
return usd * rate } rate = 1140 krw(usd: 2) // 2260 2280 krw(usd: 3) // 3390 3420
var rate = 1130 func krw(usd: Int) -> Int {
return usd * rate } ࢚కী ઓ rate = 1140 krw(usd: 2) // 2260 2280 krw(usd: 3) // 3390 3420
var rate = 1130 func krw(usd: Int) -> Int {
return usd * rate } ࢚కী ઓ rate = 1140 krw(usd: 2) // 2260 2280 krw(usd: 3) // 3390 3420 ଵઑ ైݺࢿ হ
func krw(usd: Int) -> Int { return usd * rate
}
func krw(usd: Int ) -> Int { return usd *
rate }
func krw(usd: Int, rate: Int) -> Int { return usd
* rate }
func krw(usd: Int, rate: Int) -> Int { return usd
* rate }
߈ഋ ۽Ӓې߁ਸ ਤ೧ ReactiveXо ࢎਊೞח بҳ Observable Pattern Iterator Pattern
Functional Programming
None
a 10 b a * 2
a 10 b 20
None
None
None
None
a b
10 20 30 40 a 20 40 60 80 b
10 20 30 40 a 20 40 60 80 b
10 20 30 40 a 20 40 60 80 b
map(x => x * 2)
10 20 30 40 a 20 40 60 80 b
map(x => x * 2) Marble Diagrams
20 40 60 80 b map(x => x * 2)
Observable.from([10, 20, 30, 40])
Observable.from([10, 20, 30, 40]) .map { $0 * 2 }
Observable.from([10, 20, 30, 40]) .map { $0 * 2 }
.subscribe(onNext: { value in print(value) })
Observable.from([10, 20, 30, 40]) .map { $0 * 2 }
.subscribe(onNext: { value in print(value) })
Observable.from([10, 20, 30, 40]) .map { $0 * 2 }
.subscribe(onNext: { value in print(value) })
Observable.from([10, 20, 30, 40]) .map { $0 * 2 }
.subscribe(onNext: { value in print(value) // 20 })
Observable.from([10, 20, 30, 40]) .map { $0 * 2 }
.subscribe(onNext: { value in print(value) })
Observable.from([10, 20, 30, 40]) .map { $0 * 2 }
.subscribe(onNext: { value in print(value) })
Observable.from([10, 20, 30, 40]) .map { $0 * 2 }
.subscribe(onNext: { value in print(value) // 40 })
Observable.from([10, 20, 30, 40]) .map { $0 * 2 }
.subscribe(onNext: { value in print(value) })
Observable.from([10, 20, 30, 40]) .map { $0 * 2 }
.subscribe(onNext: { value in print(value) })
Observable.from([10, 20, 30, 40]) .map { $0 * 2 }
.subscribe(onNext: { value in print(value) // 60 })
Observable.from([10, 20, 30, 40]) .map { $0 * 2 }
.subscribe(onNext: { value in print(value) })
Observable.from([10, 20, 30, 40]) .map { $0 * 2 }
.subscribe(onNext: { value in print(value) })
Observable.from([10, 20, 30, 40]) .map { $0 * 2 }
.subscribe(onNext: { value in print(value) // 80 })
Observable.from([10, 20, 30, 40]) .map { $0 * 2 }
.subscribe(onNext: { value in print(value) // 80 }) Observable
Observable.from([10, 20, 30, 40]) .map { $0 * 2 }
.subscribe(onNext: { value in print(value) // 80 }) Observer
Password ࢜ ࠺ߣഐ ࢸೞӝ (4 ࢚)
1 ࢜ ࠺ߣഐ ࢸೞӝ (4 ࢚) ࠺ߣഐо ցޖ ૣणפ. ❌
12 ࢜ ࠺ߣഐ ࢸೞӝ (4 ࢚) ࠺ߣഐо ցޖ ૣणפ. ❌
123 ࢜ ࠺ߣഐ ࢸೞӝ (4 ࢚) ࠺ߣഐо ցޖ ૣणפ. ❌
1234 ࢜ ࠺ߣഐ ࢸೞӝ (4 ࢚) ࢎਊ оמೠ ࠺ߣഐੑפ.
ੑ۱ ݫद
ੑ۱ ݫद "1"
ੑ۱ ݫद "1" map(str => str.length >= 4)
ੑ۱ ݫद "1" map(str => str.length >= 4) false
"1" false map(str => str.length >= 4) map(valid => getMessage(valid))
ੑ۱ ݫद
"1" false map(str => str.length >= 4) "❌ " map(valid
=> getMessage(valid)) ੑ۱ ݫद
"1" "12" false map(str => str.length >= 4) "❌ "
map(valid => getMessage(valid)) ੑ۱ ݫद
"1" "12" false false map(str => str.length >= 4) "❌
" map(valid => getMessage(valid)) ੑ۱ ݫद
"1" "12" false false map(str => str.length >= 4) "❌
" "❌ " map(valid => getMessage(valid)) ੑ۱ ݫद
"1" "12" "123" false false map(str => str.length >= 4)
"❌ " "❌ " map(valid => getMessage(valid)) ੑ۱ ݫद
"1" "12" "123" false false false map(str => str.length >=
4) "❌ " "❌ " map(valid => getMessage(valid)) ੑ۱ ݫद
"1" "12" "123" false false false map(str => str.length >=
4) "❌ " "❌ " "❌ " map(valid => getMessage(valid)) ੑ۱ ݫद
"1" "12" "123" "1234" false false false map(str => str.length
>= 4) "❌ " "❌ " "❌ " map(valid => getMessage(valid)) ੑ۱ ݫद
"1" "12" "123" "1234" false false false true map(str =>
str.length >= 4) "❌ " "❌ " "❌ " map(valid => getMessage(valid)) ੑ۱ ݫद
false false false true map(str => str.length >= 4) map(valid
=> getMessage(valid)) "1" "12" "123" "1234" ੑ۱ "❌ " "❌ " "❌ " "" ݫद
passwordField.rx.text.orEmpty
passwordField.rx.text.orEmpty .map { $0.characters.count >= 4 }
passwordField.rx.text.orEmpty .map { $0.characters.count >= 4 } .map { isValid
in }
passwordField.rx.text.orEmpty .map { $0.characters.count >= 4 } .map { isValid
in if isValid { return "ࢎਊ оמೠ ࠺ߣഐੑפ. " } else { return "࠺ߣഐо ցޖ ૣणפ. ❌" } }
passwordField.rx.text.orEmpty .map { $0.characters.count >= 4 } .map { isValid
in if isValid { return "ࢎਊ оמೠ ࠺ߣഐੑפ. " } else { return "࠺ߣഐо ցޖ ૣणפ. ❌" } } .subscribe(onNext: { [weak self] message in self?.messageLabel.rx.text = message })
passwordField.rx.text.orEmpty .map { $0.characters.count >= 4 } .map { isValid
in if isValid { return "ࢎਊ оמೠ ࠺ߣഐੑפ. " } else { return "࠺ߣഐо ցޖ ૣणפ. ❌" } } .subscribe(onNext: { [weak self] message in self?.messageLabel.rx.text = message }) "1"
passwordField.rx.text.orEmpty .map { $0.characters.count >= 4 } .map { isValid
in if isValid { return "ࢎਊ оמೠ ࠺ߣഐੑפ. " } else { return "࠺ߣഐо ցޖ ૣणפ. ❌" } } .subscribe(onNext: { [weak self] message in self?.messageLabel.rx.text = message }) false
passwordField.rx.text.orEmpty .map { $0.characters.count >= 4 } .map { isValid
in if isValid { return "ࢎਊ оמೠ ࠺ߣഐੑפ. " } else { return "࠺ߣഐо ցޖ ૣणפ. ❌" } } .subscribe(onNext: { [weak self] message in self?.messageLabel.rx.text = message })
passwordField.rx.text.orEmpty .map { $0.characters.count >= 4 } .map { isValid
in if isValid { return "ࢎਊ оמೠ ࠺ߣഐੑפ. " } else { return "࠺ߣഐо ցޖ ૣणפ. ❌" } } .subscribe(onNext: { [weak self] message in self?.messageLabel.rx.text = message })
passwordField.rx.text.orEmpty .map { $0.characters.count >= 4 } .map { isValid
in if isValid { return "ࢎਊ оמೠ ࠺ߣഐੑפ. " } else { return "࠺ߣഐо ցޖ ૣणפ. ❌" } } .subscribe(onNext: { [weak self] message in self?.messageLabel.rx.text = message }) "12"
passwordField.rx.text.orEmpty .map { $0.characters.count >= 4 } .map { isValid
in if isValid { return "ࢎਊ оמೠ ࠺ߣഐੑפ. " } else { return "࠺ߣഐо ցޖ ૣणפ. ❌" } } .subscribe(onNext: { [weak self] message in self?.messageLabel.rx.text = message }) false
passwordField.rx.text.orEmpty .map { $0.characters.count >= 4 } .map { isValid
in if isValid { return "ࢎਊ оמೠ ࠺ߣഐੑפ. " } else { return "࠺ߣഐо ցޖ ૣणפ. ❌" } } .subscribe(onNext: { [weak self] message in self?.messageLabel.rx.text = message })
passwordField.rx.text.orEmpty .map { $0.characters.count >= 4 } .map { isValid
in if isValid { return "ࢎਊ оמೠ ࠺ߣഐੑפ. " } else { return "࠺ߣഐо ցޖ ૣणפ. ❌" } } .subscribe(onNext: { [weak self] message in self?.messageLabel.rx.text = message })
passwordField.rx.text.orEmpty .map { $0.characters.count >= 4 } .map { isValid
in if isValid { return "ࢎਊ оמೠ ࠺ߣഐੑפ. " } else { return "࠺ߣഐо ցޖ ૣणפ. ❌" } } .subscribe(onNext: { [weak self] message in self?.messageLabel.rx.text = message }) "123"
passwordField.rx.text.orEmpty .map { $0.characters.count >= 4 } .map { isValid
in if isValid { return "ࢎਊ оמೠ ࠺ߣഐੑפ. " } else { return "࠺ߣഐо ցޖ ૣणפ. ❌" } } .subscribe(onNext: { [weak self] message in self?.messageLabel.rx.text = message }) false
passwordField.rx.text.orEmpty .map { $0.characters.count >= 4 } .map { isValid
in if isValid { return "ࢎਊ оמೠ ࠺ߣഐੑפ. " } else { return "࠺ߣഐо ցޖ ૣणפ. ❌" } } .subscribe(onNext: { [weak self] message in self?.messageLabel.rx.text = message })
passwordField.rx.text.orEmpty .map { $0.characters.count >= 4 } .map { isValid
in if isValid { return "ࢎਊ оמೠ ࠺ߣഐੑפ. " } else { return "࠺ߣഐо ցޖ ૣणפ. ❌" } } .subscribe(onNext: { [weak self] message in self?.messageLabel.rx.text = message })
passwordField.rx.text.orEmpty .map { $0.characters.count >= 4 } .map { isValid
in if isValid { return "ࢎਊ оמೠ ࠺ߣഐੑפ. " } else { return "࠺ߣഐо ցޖ ૣणפ. ❌" } } .subscribe(onNext: { [weak self] message in self?.messageLabel.rx.text = message }) "1234"
passwordField.rx.text.orEmpty .map { $0.characters.count >= 4 } .map { isValid
in if isValid { return "ࢎਊ оמೠ ࠺ߣഐੑפ. " } else { return "࠺ߣഐо ցޖ ૣणפ. ❌" } } .subscribe(onNext: { [weak self] message in self?.messageLabel.rx.text = message }) true
passwordField.rx.text.orEmpty .map { $0.characters.count >= 4 } .map { isValid
in if isValid { return "ࢎਊ оמೠ ࠺ߣഐੑפ. " } else { return "࠺ߣഐо ցޖ ૣणפ. ❌" } } .subscribe(onNext: { [weak self] message in self?.messageLabel.rx.text = message })
passwordField.rx.text.orEmpty .map { $0.characters.count >= 4 } .map { isValid
in if isValid { return "ࢎਊ оמೠ ࠺ߣഐੑפ. " } else { return "࠺ߣഐо ցޖ ૣणפ. ❌" } } .subscribe(onNext: { [weak self] message in self?.messageLabel.rx.text = message })
ࢎਊ ੋఠۑ࣌ਸ ؘఠ ܴਵ۽ അ оמ
ࢎਊ ੋఠۑ࣌ਸ ؘఠ ܴਵ۽ അ оמ Ӗ ੑ۱: Observable<String> ं
ੑ۱: Observable<Int> ߡౡ ఠ: Observable<Void> झ܀: Observable<CGPoint> ...
Observable ࠺زӝ झܿ
"1" "12" "123" "1234"
"1"
"1" ࠺زӝ
"1" "12" ࠺زӝ
"1" "12" ࠺زӝ ࠺زӝ
"1" "12" "123" ࠺زӝ ࠺زӝ
"1" "12" "123" ࠺زӝ ࠺زӝ ࠺زӝ
"1" "12" "123" "1234" ࠺زӝ ࠺زӝ ࠺زӝ
ࢎਊ ץ֎ ࢸೞӝ Nickname
݃ழߡӒ ࢎਊ ץ֎ ࢸೞӝ ࢎਊੋ ץ֎ੑפ. ❌
࠽ѱஎ ࢎਊ ץ֎ ࢸೞӝ ࢎਊੋ ץ֎ੑפ. ❌
ࣻৌ ࢎਊ ץ֎ ࢸೞӝ ࢎਊ оמೠ ץ֎ੑפ.
ץ֎ ࠂ ܳ ਤ೧ APIܳ ࢎਊ
ץ֎ ࠂ ܳ ਤ೧ APIܳ ࢎਊ = ࠺زӝ স
nicknameField.rx.text.orEmpty
nicknameField.rx.text.orEmpty .map { nickname -> Bool in // return true
of false }
࠺زӝ? nicknameField.rx.text.orEmpty .map { nickname -> Bool in // return
true of false }
nicknameField.rx.text.orEmpty . map { nickname -> Bool in }
nicknameField.rx.text.orEmpty .flatMap { nickname -> Observable<Bool> in }
nicknameField.rx.text.orEmpty .flatMap { nickname -> Observable<Bool> in return API.checkNickname(nickname) }
nicknameField.rx.text.orEmpty .flatMap { nickname -> Observable<Bool> in return API.checkNickname(nickname) }
.map { isAvailable in return getMessage(isAvailable) }
nicknameField.rx.text.orEmpty .flatMap { nickname -> Observable<Bool> in return API.checkNickname(nickname) }
.map { isAvailable in return getMessage(isAvailable) } .subscribe(onNext: { [weak self] message in self?.messageLabel.text = message })
map() vs flatMap() 20 40 60 80 map(x => x
* 2) 10 20 30 40
map() vs flatMap() flatMap( => )
map() vs flatMap() flatMap( => )
map() vs flatMap() flatMap( => )
map() vs flatMap() flatMap( => )
map() vs flatMap() flatMap( => )
map() vs flatMap() flatMap( => )
map() vs flatMap() flatMap( => )
map() vs flatMap() flatMap( => )
map() vs flatMap() flatMap( => )
map() vs flatMap() flatMap( => )
map() vs flatMap() flatMap( => )
ࢎਊ ץ֎ ࢸೞӝ Nickname
checkNickname("Ŷ") checkNickname("݃") checkNickname("⽃") checkNickname("݃") checkNickname("݃䄲") checkNickname("݃") checkNickname("݃㬌") checkNickname("݃ழ")
nicknameField.rx.text.orEmpty .flatMap { nickname -> Observable<Bool> in return API.checkNickname(nickname) }
.map { isAvailable in return getMessage(isAvailable) } .subscribe(onNext: { [weak self] message in self?.messageLabel.text = message })
nicknameField.rx.text.orEmpty .debounce(0.3, scheduler: MainScheduler.instance) .flatMap { nickname -> Observable<Bool> in
return API.checkNickname(nickname) } .map { isAvailable in return getMessage(isAvailable) } .subscribe(onNext: { [weak self] message in self?.messageLabel.text = message })
checkNickname("Ŷ") checkNickname("݃") checkNickname("⽃") checkNickname("݃") checkNickname("݃䄲") checkNickname("݃") checkNickname("݃㬌") checkNickname("݃ழ")
checkNickname("Ŷ") checkNickname("݃") checkNickname("⽃") checkNickname("݃") checkNickname("݃䄲") checkNickname("݃") checkNickname("݃㬌") checkNickname("݃ழ") 0.3s 0.3s
0.3s
checkNickname("Ŷ") checkNickname("݃") checkNickname("⽃") checkNickname("݃") checkNickname("݃䄲") checkNickname("݃") checkNickname("݃㬌") checkNickname("݃ழ") 0.3s 0.3s
0.3s
1 4 debounce 1 2 3 4
ࠂ೧ ࣻ ח ࢚క ҙܻо рѾ೧
ױ, Observable ࢤݺ ӝח ҙܻ
Timer 00:17
Timer 00:17 Observable<Int> .interval(1, scheduler: ...) .subscribe(onNext: { tick in
print(tick) })
Timer 00:17
Start
17 18 19 20 21 ... Start
Start ചݶ ࢎۄ݅ Observable ҅ࣘ ز
Timer 00:17 Observable<Int> .interval(1, scheduler: ...) .subscribe(onNext: { tick in
print(tick) })
Timer 00:17 var disposeBag = DisposeBag() Observable<Int> .interval(1, scheduler: ...)
.subscribe(onNext: { tick in print(tick) }) .disposed(by: disposeBag)
Timer 00:17 var disposeBag = DisposeBag() Observable<Int> .interval(1, scheduler: ...)
.subscribe(onNext: { tick in print(tick) }) .disposed(by: disposeBag)
var disposeBag = DisposeBag() Observable<Int> .interval(1, scheduler: ...) .subscribe(onNext: {
tick in print(tick) }) .disposed(by: disposeBag) Start
var disposeBag = DisposeBag() Observable<Int> .interval(1, scheduler: ...) .subscribe(onNext: {
tick in print(tick) }) .disposed(by: disposeBag) Start ݫݽܻীࢲ ೧ઁ
var disposeBag = DisposeBag() Observable<Int> .interval(1, scheduler: ...) .subscribe(onNext: {
tick in print(tick) }) .disposed(by: disposeBag) Start
var disposeBag = DisposeBag() Observable<Int> .interval(1, scheduler: ...) .subscribe(onNext: {
tick in print(tick) }) .disposed(by: disposeBag) Start Dispose
• ࢎਊ ੋఠۑ࣌ਸ ؘఠ ܴਵ۽ ܻ • ӈଳ ࢚క ҙܻܳ
ࣚऔѱ • ࠺زӝ ٘ܳ ాੌػ ߑधਵ۽ ࢎਊ RxSwift
http://reactivex.io http://rxswift.org http://community.rxswift.org https://rxswift-slack.herokuapp.com
хࢎפ. ࣻৌ (github.com/devxoul)