Reactive Programming with RxSwift
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The document discusses RxSwift, a library for reactive programming in Swift that models asynchronous sequences. It explains fundamental concepts and operators of RxSwift, provides examples of creating and subscribing to observables, and outlines various operators for transforming, filtering, and error handling. Additionally, it highlights resources for learning more about RxSwift and encourages engagement with the community.
![exampleOf("toObservable") {
}
--- Example of: toObservable ---
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3
CREATING & SUBSCRIBING
let disposeBag = DisposeBag()
[1, 2, 3].toObservable()
.subscribeNext {
print($0)
}
.addDisposableTo(disposeBag)](https://image.slidesharecdn.com/reactiveprogrammingwithrxswift-160615194632/85/Reactive-Programming-with-RxSwift-30-320.jpg)
![exampleOf("takeWhile") {
[1, 2, 3, 4, 5, 6, 5, 4, 3, 2, 1].toObservable()
.takeWhile { $0 < 5 }
.subscribeNext { print($0) }
.dispose()
}
CONDITIONAL
--- Example of: takeWhile ---
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4](https://image.slidesharecdn.com/reactiveprogrammingwithrxswift-160615194632/85/Reactive-Programming-with-RxSwift-43-320.jpg)
Reactive Programming with RxSwift
- 2. ABOUT ME
- 4. TRADITIONAL VS. REACTIVE A SIMPLE EXAMPLE IN IOS
- 5. MODEL
- 6. VIEW MODEL
- 12. Reactive Programming is essentially about modeling asynchronous sequences What is Reactive Programming?
- 13. Reactive Programming is essentially about modeling asynchronous sequences
- 14. What is Reactive Programming? Reactive Programming is essentially about modeling asynchronous sequences So what is RxSwift? RxSwift implements patterns, types, and operators to create and work with Observable sequences
- 17. ABOUT RX ▸ Event-driven ▸ Asynchronous ▸ Functional ▸ Common patterns ▸ Observer ▸ Iterator ▸ Cross-platform
- 18. LIFECYCLE OF AN OBSERVABLE SEQUENCE ▸ Next 1 2 3
- 19. LIFECYCLE OF AN OBSERVABLE SEQUENCE ▸ Next tap tap tap
- 20. LIFECYCLE OF AN OBSERVABLE SEQUENCE ▸ Next ▸ Error 1 2 3
- 21. LIFECYCLE OF AN OBSERVABLE SEQUENCE ▸ Next ▸ Error ▸ Completed 1 2 3
- 22. LIFECYCLE OF AN OBSERVABLE SEQUENCE ▸ Next ▸ Error ▸ Completed ▸ dispose() / DisposeBag 1 2 3
- 24. SETUP ▸ Install ThisCouldBeUsButYouPlaying ▸ bit.ly/podsPlaygrounds ▸ gem install cocoapods-playgrounds ▸ Create RxSwiftPlayground ▸ pod playgrounds RxSwift
- 25. SETUP //: Please build the scheme 'RxSwiftPlayground' first import XCPlayground XCPlaygroundPage.currentPage.needsIndefiniteExecution = true import RxSwift func exampleOf(description: String, action: Void -> Void) { print("n--- Example of:", description, "---") action() }
- 26. --- Example of: just --- Next(32) Completed CREATING & SUBSCRIBING exampleOf("just") { Observable.just(32) } .subscribe { } print($0)
- 27. --- Example of: just --- Next(32) Completed exampleOf("just") { Observable.just(32) .subscribe { element in print(element) } } CREATING & SUBSCRIBING
- 28. --- Example of: just --- 32 exampleOf("just") { _ = Observable.just(32) .subscribeNext { print($0) } } CREATING & SUBSCRIBING
- 29. --- Example of: of --- 1 2 3 4 5 CREATING & SUBSCRIBING exampleOf("of") { Observable.of(1, 2, 3, 4, 5) } .subscribeNext { print($0) } .dispose()
- 30. exampleOf("toObservable") { } --- Example of: toObservable --- 1 2 3 CREATING & SUBSCRIBING let disposeBag = DisposeBag() [1, 2, 3].toObservable() .subscribeNext { print($0) } .addDisposableTo(disposeBag)
- 31. CREATING & SUBSCRIBING let string = BehaviorSubject(value: "Hello") string.subscribe { print($0) } .addDisposableTo(disposeBag) exampleOf("BehaviorSubject") { let disposeBag = DisposeBag() } string.on(.Next("World!"))
- 32. CREATING & SUBSCRIBING let string = BehaviorSubject(value: "Hello") string.subscribe { print($0) } .addDisposableTo(disposeBag) string.onNext("World!") exampleOf("BehaviorSubject") { let disposeBag = DisposeBag() }
- 33. --- Example of: BehaviorSubject --- Next(Hello) Next(World!) CREATING & SUBSCRIBING let string = BehaviorSubject(value: "Hello") string.subscribe { print($0) } .addDisposableTo(disposeBag) string.onNext("World!") exampleOf("BehaviorSubject") { let disposeBag = DisposeBag() }
- 34. CREATING & SUBSCRIBING --- Example of: Variable --- Next(1) Next(12) Next(1234567) Completed number.value = 12 number.value = 1_234_567 exampleOf("Variable") { let disposeBag = DisposeBag() let number = Variable(1) number.asObservable() .subscribe { print($0) } .addDisposableTo(disposeBag) }
- 35. TRANSFORMING --- Example of: map --- 1 4 9 Observable.of(1, 2, 3) example("map") { let disposeBag = DisposeBag() } .map { $0 * $0 } .subscribeNext { print($0) } .addDisposableTo(disposeBag)
- 36. TRANSFORMING 1 1 2 4 3 9 map { $0 * $0 }
- 37. TRANSFORMING --- Example of: flatMap --- Scott Lori Eric exampleOf("flatMap") { let disposeBag = DisposeBag() } struct Person { var name: Variable<String> } let scott = Person(name: Variable("Scott")) let lori = Person(name: Variable("Lori")) let person = Variable(scott) person.asObservable() .flatMap { $0.name.asObservable() } .subscribeNext { print($0) } .addDisposableTo(disposeBag) person.value = lori scott.name.value = "Eric"
- 38. TRANSFORMING --- Example of: flatMapLatest --- Scott Lori exampleOf("flatMapLatest") { let disposeBag = DisposeBag() struct Person { var name: Variable<String> } let scott = Person(name: Variable("Scott")) let lori = Person(name: Variable("Lori")) let person = Variable(scott) person.asObservable() .flatMapLatest { $0.name.asObservable() } .subscribeNext { print($0) } .addDisposableTo(disposeBag) person.value = lori scott.name.value = "Eric" }
- 39. TRANSFORMING exampleOf("flatMapLatest") { let disposeBag = DisposeBag() struct Person { var name: Variable<String> } let scott = Person(name: Variable("Scott")) let lori = Person(name: Variable("Lori")) let person = Variable(scott) person.asObservable() .debug("person") .flatMapLatest { $0.name.asObservable() } .subscribeNext { print($0) } .addDisposableTo(disposeBag) person.value = lori scott.name.value = "Eric" } --- Example of: flatMapLatest --- 2016-05-28 07:31:22.555: person -> subscribed 2016-05-28 07:31:22.556: person -> Event Next((Person #1)(nam...able<Swift.String>)) Scott 2016-05-28 07:31:22.557: person -> Event Next((Person #1)(nam...able<Swift.String>)) Lori 2016-05-28 07:31:22.560: person -> Event Completed 2016-05-28 07:31:22.560: person -> disposed
- 40. RXSWIFT OPERATORS ▸ Creating asObservable create deferred empty error toObservable interval never just of range repeatElement timer ▸ Transforming buffer flatMap flatMapFirst flatMapLatest map scan window ▸ Filtering debounce / throttle distinctUntilChanged elementAt filter sample skip take takeLast single ▸ Conditional & Boolean amb skipWhile skipUntil takeUntil takeWhile ▸ Mathematical & Aggregate concat reduce toArray ▸ Connectable multicast publish refCount replay shareReplay ▸ Combining merge startWith switchLatest combineLatest zip ▸ Error Handling catch retry retryWhen ▸ Observing delaySubscription do / doOnNext observeOn subscribe subscribeOn timeout using debug
- 41. exampleOf("distinctUntilChanged") { let disposeBag = DisposeBag() let searchString = Variable("iOS") searchString.asObservable() .map { $0.lowercaseString } .distinctUntilChanged() .subscribeNext { print($0) } .addDisposableTo(disposeBag) searchString.value = "IOS" searchString.value = "Rx" searchString.value = "ios" } FILTERING --- Example of: distinctUntilChanged --- ios rx ios
- 42. exampleOf("combineLatest") { let disposeBag = DisposeBag() let number = PublishSubject<Int>() let string = PublishSubject<String>() Observable.combineLatest(number, string) { "($0) ($1)" } .subscribeNext { print($0) } .addDisposableTo(disposeBag) number.onNext(1) print("Nothing yet") string.onNext("A") number.onNext(2) string.onNext("B") string.onNext("C") } COMBINING --- Example of: combineLatest --- Nothing yet 1 A 2 A 2 B 2 C
- 43. exampleOf("takeWhile") { [1, 2, 3, 4, 5, 6, 5, 4, 3, 2, 1].toObservable() .takeWhile { $0 < 5 } .subscribeNext { print($0) } .dispose() } CONDITIONAL --- Example of: takeWhile --- 1 2 3 4
- 44. MATHEMATICAL --- Example of: _scan --- 11 13 16 20 25 exampleOf("scan") { Observable.of(1, 2, 3, 4, 5) .subscribeNext { print($0) } .dispose() } .scan(10, accumulator: +)
- 45. MATHEMATICAL --- Example of: _scan --- 11 13 16 20 25 exampleOf("scan") { Observable.of(1, 2, 3, 4, 5) .subscribeNext { print($0) } .dispose() } .scan(10) { $0 + $1 }
- 46. ERROR HANDLING --- Example of: error --- A exampleOf("error") { enum Error: ErrorType { case A } Observable<Int>.error(Error.A) .subscribeError { // Handle error print($0) } .dispose() }
- 47. NETWORKING
- 48. NETWORKING
- 49. NETWORKING
- 50. NETWORKING
- 52. NETWORKING
- 53. How about one more?
- 54. RXCOREDATA
- 55. RXCOREDATA
- 56. NETWORKING
- 57. How do I get started with RxSwift? I’m glad you asked! !
- 58. LEARN RXSWIFT ▸This talk ▸RxSwift operators
- 60. LEARN RXSWIFT ▸This talk ▸RxSwift operators ▸RxCocoa ▸RxExample
- 63. LEARN RXSWIFT ▸This talk ▸RxSwift operators ▸RxCocoa ▸RxExample ▸RxCommunity
- 64. ▸ github.com/ReactiveX/RxSwift ▸ reactivex.io ▸ rxmarbles.com ▸ slack.rxswift.org ▸ rx-marin.com ▸ as.ync.io ▸ github.com/scotteg/RxSwiftPlayer ▸ github.com/Artsy/eidolon ▸ lynda.com/Scott-Gardner/281956-1.html WANT MORE RXSWIFT?
- 65. QUESTIONS?