RxSwift 활용하기 - Let'Swift 2017

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letswift(17) RxSwift Reactive Extensions forSwift 최완복

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iOS fb.com/wanbok choi@wanbok.com

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letswift(17) Prologue

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subscribe

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: 86 :47 subscribe - : 40 : 5

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letswift(17) RxSwift ?

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RxSwift • / • • GCD, KVO, Delegate, NotiﬁcationCenter •

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Adding numbers • UITextField •KVO : .valueChanged • UITextFieldDelegate : • • UILabel text func textField(UITextField, shouldChangeCharac tersIn: NSRange, replacementString: String) https://github.com/ReactiveX/RxSwift/tree/master/RxExample/RxExample/Examples/Numbers

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Adding numbers Rx •UITextField text • • • UILabel text https://github.com/ReactiveX/RxSwift/tree/master/RxExample/RxExample/Examples/Numbers

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Adding numbers func combineValues(){ let num1 = Int(self.number1?.text ?? "") ?? 0 let num2 = Int(self.number2?.text ?? "") ?? 0 let num3 = Int(self.number3?.text ?? "") ?? 0 let result: Int = num1 + num2 + num3 self.result?.text = result.description } override func viewDidLoad() { super.viewDidLoad() number1?.addTarget(self, action: #selector(self.combineValues), for: .valueChanged) number2?.addTarget(self, action: #selector(self.combineValues), for: .valueChanged) number3?.addTarget(self, action: #selector(self.combineValues), for: .valueChanged) } } https://github.com/ReactiveX/RxSwift/tree/master/RxExample/RxExample/Examples/Numbers

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Adding numbers .valueChanged funccombineValues() { let num1 = Int(self.number1?.text ?? "") ?? 0 let num2 = Int(self.number2?.text ?? "") ?? 0 let num3 = Int(self.number3?.text ?? "") ?? 0 let result: Int = num1 + num2 + num3 self.result?.text = result.description } override func viewDidLoad() { super.viewDidLoad() number1?.addTarget(self, action: #selector(self.combineValues), for: .valueChanged) number2?.addTarget(self, action: #selector(self.combineValues), for: .valueChanged) number3?.addTarget(self, action: #selector(self.combineValues), for: .valueChanged) } }

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Adding numbers func combineValues(){ let num1 = Int(self.number1?.text ?? "") ?? 0 let num2 = Int(self.number2?.text ?? "") ?? 0 let num3 = Int(self.number3?.text ?? "") ?? 0 let result: Int = num1 + num2 + num3 self.result?.text = result.description } override func viewDidLoad() { super.viewDidLoad() number1?.addTarget(self, action: #selector(self.combineValues), for: .valueChanged) number2?.addTarget(self, action: #selector(self.combineValues), for: .valueChanged) number3?.addTarget(self, action: #selector(self.combineValues), for: .valueChanged) } }

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Adding numbers UILabel text func combineValues() { let num1 = Int(self.number1?.text ?? "") ?? 0 let num2 = Int(self.number2?.text ?? "") ?? 0 let num3 = Int(self.number3?.text ?? "") ?? 0 let result: Int = num1 + num2 + num3 self.result?.text = result.description } override func viewDidLoad() { super.viewDidLoad() number1?.addTarget(self, action: #selector(self.combineValues), for: .valueChanged) number2?.addTarget(self, action: #selector(self.combineValues), for: .valueChanged) number3?.addTarget(self, action: #selector(self.combineValues), for: .valueChanged) } }

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Adding numbers override funcviewDidLoad() { super.viewDidLoad() Observable .combineLatest( number1.rx.text.orEmpty, number2.rx.text.orEmpty, number3.rx.text.orEmpty ) { text1, text2, text3 -> Int in return (Int(text1) ?? 0) + (Int(text2) ?? 0) + (Int(text3) ?? 0) } .map { $0.description } .bind(to: result.rx.text) .disposed(by: disposeBag) } https://github.com/ReactiveX/RxSwift/tree/master/RxExample/RxExample/Examples/Numbers

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Adding numbers number.rx.text overridefunc viewDidLoad() { super.viewDidLoad() Observable .combineLatest( number1.rx.text.orEmpty, number2.rx.text.orEmpty, number3.rx.text.orEmpty ) { text1, text2, text3 -> Int in return (Int(text1) ?? 0) + (Int(text2) ?? 0) + (Int(text3) ?? 0) } .map { $0.description } .bind(to: result.rx.text) .disposed(by: disposeBag) }

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Adding numbers override funcviewDidLoad() { super.viewDidLoad() Observable .combineLatest( number1.rx.text.orEmpty, number2.rx.text.orEmpty, number3.rx.text.orEmpty ) { text1, text2, text3 -> Int in return (Int(text1) ?? 0) + (Int(text2) ?? 0) + (Int(text3) ?? 0) } .map { $0.description } .bind(to: result.rx.text) .disposed(by: disposeBag) }

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Adding numbers UILabel.rx.text override func viewDidLoad() { super.viewDidLoad() Observable .combineLatest( number1.rx.text.orEmpty, number2.rx.text.orEmpty, number3.rx.text.orEmpty ) { text1, text2, text3 -> Int in return (Int(text1) ?? 0) + (Int(text2) ?? 0) + (Int(text3) ?? 0) } .map { $0.description } .bind(to: result.rx.text) .disposed(by: disposeBag) }

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func combineValues() { letnum1 = Int(self.number1?.text ?? "") ?? 0 let num2 = Int(self.number2?.text ?? "") ?? 0 let num3 = Int(self.number3?.text ?? "") ?? 0 let result: Int = num1 + num2 + num3 self.result?.text = result.description } override func viewDidLoad() { super.viewDidLoad() number1?.addTarget(self, action: #selector(self.combineValues), for: .valueChanged) number2?.addTarget(self, action: #selector(self.combineValues), for: .valueChanged) number3?.addTarget(self, action: #selector(self.combineValues), for: .valueChanged) } } override func viewDidLoad() { super.viewDidLoad() Observable .combineLatest( number1.rx.text.orEmpty, number2.rx.text.orEmpty, number3.rx.text.orEmpty ) { text1, text2, text3 -> Int in return (Int(text1) ?? 0) + (Int(text2) ?? 0) + (Int(text3) ?? 0) } .map { $0.description } .bind(to: result.rx.text) .disposed(by: disposeBag) }

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func combineValues() { letnum1 = Int(self.number1?.text ?? "") ?? 0 let num2 = Int(self.number2?.text ?? "") ?? 0 let num3 = Int(self.number3?.text ?? "") ?? 0 let result: Int = num1 + num2 + num3 self.result?.text = result.description } override func viewDidLoad() { super.viewDidLoad() number1?.addTarget(self, action: #selector(self.combineValues), for: .valueChanged) number2?.addTarget(self, action: #selector(self.combineValues), for: .valueChanged) number3?.addTarget(self, action: #selector(self.combineValues), for: .valueChanged) } } override func viewDidLoad() { super.viewDidLoad() Observable .combineLatest( number1.rx.text.orEmpty, number2.rx.text.orEmpty, number3.rx.text.orEmpty ) { text1, text2, text3 -> Int in return (Int(text1) ?? 0) + (Int(text2) ?? 0) + (Int(text3) ?? 0) } .map { $0.description } .bind(to: result.rx.text) .disposed(by: disposeBag) }

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func combineValues() { letnum1 = Int(self.number1?.text ?? "") ?? 0 let num2 = Int(self.number2?.text ?? "") ?? 0 let num3 = Int(self.number3?.text ?? "") ?? 0 let result: Int = num1 + num2 + num3 self.result?.text = result.description } override func viewDidLoad() { super.viewDidLoad() number1?.addTarget(self, action: #selector(self.handleNumber1), for: .valueChanged) number2?.addTarget(self, action: #selector(self.handleNumber2), for: .valueChanged) number3?.addTarget(self, action: #selector(self.handleNumber3), for: .valueChanged) } func handleNumber1() { self.analytics1() self.combineValue() } } override func viewDidLoad() { super.viewDidLoad() Observable .combineLatest( number1.rx.text.orEmpty .do(onNext: { analytics1() }), number2.rx.text.orEmpty number3.rx.text.orEmpty ) { text1, text2, text3 -> Int in return (Int(text1) ?? 0) + (Int(text2) ?? 0) + (Int(text3) ?? 0) } .map { $0.description } .bind(to: result.rx.text) .disposed(by: disposeBag) }

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func combineValues() { letnum1 = Int(self.number1?.text ?? "") ?? 0 let num2 = Int(self.number2?.text ?? "") ?? 0 let num3 = Int(self.number3?.text ?? "") ?? 0 let result: Int = num1 + num2 + num3 self.result?.text = result.description } override func viewDidLoad() { super.viewDidLoad() number1?.addTarget(self, action: #selector(self.handleNumber1), for: .valueChanged) number2?.addTarget(self, action: #selector(self.handleNumber2), for: .valueChanged) number3?.addTarget(self, action: #selector(self.handleNumber3), for: .valueChanged) } func handleNumber1() { self.analytics1() self.combineValue() } … } override func viewDidLoad() { super.viewDidLoad() Observable .combineLatest( number1.rx.text.orEmpty .do(onNext: { analytics1() }), number2.rx.text.orEmpty .do(onNext: { analytics2() }), number3.rx.text.orEmpty .do(onNext: { analytics3() }) ) { text1, text2, text3 -> Int in return (Int(text1) ?? 0) + (Int(text2) ?? 0) + (Int(text3) ?? 0) } .map { $0.description } .bind(to: result.rx.text) .disposed(by: disposeBag) }

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func combineValues() { letnum1 = Int(self.number1?.text ?? "") ?? 0 let num2 = Int(self.number2?.text ?? "") ?? 0 let num3 = Int(self.number3?.text ?? "") ?? 0 let result: Int = num1 + num2 + num3 self.analyticsTotal(result) self.result?.text = result.description } override func viewDidLoad() { super.viewDidLoad() number1?.addTarget(self, action: #selector(self.handleNumber1), for: .valueChanged) number2?.addTarget(self, action: #selector(self.handleNumber2), for: .valueChanged) number3?.addTarget(self, action: #selector(self.handleNumber3), for: .valueChanged) } func handleNumber1() { self.analytics1() self.combineValue() } … } override func viewDidLoad() { super.viewDidLoad() Observable .combineLatest( number1.rx.text.orEmpty .do(onNext: { analytics1() }), number2.rx.text.orEmpty .do(onNext: { analytics2() }), number3.rx.text.orEmpty .do(onNext: { analytics3() }) ) { text1, text2, text3 -> Int in return (Int(text1) ?? 0) + (Int(text2) ?? 0) + (Int(text3) ?? 0) } .map { $0.description } .do(onNext: { analyticsTotal() }) .bind(to: result.rx.text) .disposed(by: disposeBag) }

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func combineValues() { letnum1 = Int(self.number1?.text ?? "") ?? 0 let num2 = Int(self.number2?.text ?? "") ?? 0 let num3 = Int(self.number3?.text ?? "") ?? 0 let result: Int = num1 + num2 + num3 self.analyticsTotal(result) self.result?.text = result.description } override func viewDidLoad() { super.viewDidLoad() number1?.addTarget(self, action: #selector(self.handleNumber1), for: .valueChanged) number2?.addTarget(self, action: #selector(self.handleNumber2), for: .valueChanged) number3?.addTarget(self, action: #selector(self.handleNumber3), for: .valueChanged) } func handleNumber1() { self.analytics1() self.combineValue() } … } override func viewDidLoad() { super.viewDidLoad() Observable .combineLatest( number1.rx.text.orEmpty .do(onNext: { analytics1() }), number2.rx.text.orEmpty .do(onNext: { analytics2() }), number3.rx.text.orEmpty .do(onNext: { analytics3() }) ) { text1, text2, text3 -> Int in return (Int(text1) ?? 0) + (Int(text2) ?? 0) + (Int(text3) ?? 0) } .debounce(3) .map { $0.description } .do(onNext: { analyticsTotal() }) .bind(to: result.rx.text) .disposed(by: disposeBag) }

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func combineValues() { letnum1 = Int(self.number1?.text ?? "") ?? 0 let num2 = Int(self.number2?.text ?? "") ?? 0 let num3 = Int(self.number3?.text ?? "") ?? 0 let result: Int = num1 + num2 + num3 self.analyticsTotal(result) self.result?.text = result.description } override func viewDidLoad() { super.viewDidLoad() number1?.addTarget(self, action: #selector(self.handleNumber1), for: .valueChanged) number2?.addTarget(self, action: #selector(self.handleNumber2), for: .valueChanged) number3?.addTarget(self, action: #selector(self.handleNumber3), for: .valueChanged) } func handleNumber1() { self.analytics1() self.combineValue() } … } override func viewDidLoad() { super.viewDidLoad() Observable .combineLatest( number1.rx.text.orEmpty .do(onNext: { analytics1() }), number2.rx.text.orEmpty .do(onNext: { analytics2() }), number3.rx.text.orEmpty .do(onNext: { analytics3() }) ) { text1, text2, text3 -> Int in return (Int(text1) ?? 0) + (Int(text2) ?? 0) + (Int(text3) ?? 0) } .debounce(3) .map { $0.description } .do(onNext: { analyticsTotal() }) .bind(to: result.rx.text) .disposed(by: disposeBag) } ?

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letswift(17) RxSwift ?

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RxSwift • • •

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UIKit RxOperators MVC ReactorKit,MVVM

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? ?? ?

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letswift(17) Observable(with RxMarble)

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Observable enum Event<Element> { casenext(Element) // next element of a sequence case error(Swift.Error) // sequence failed with error case completed // sequence terminated successfully } class Observable<Element> { func subscribe(_ observer: Observer<Element>) -> Disposable } protocol ObserverType { func on(_ event: Event<Element>) }

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Observable import UIKit import RxSwift importRxCocoa class NumbersViewController: ViewController { @IBOutlet weak var number1: UITextField! @IBOutlet weak var number2: UITextField! @IBOutlet weak var number3: UITextField! @IBOutlet weak var result: UILabel! override func viewDidLoad() { super.viewDidLoad() Observable .combineLatest( number1.rx.text.orEmpty, number2.rx.text.orEmpty, number3.rx.text.orEmpty ) { textValue1, textValue2, textValue3 -> Int in return (Int(textValue1) ?? 0) + (Int(textValue2) ?? 0) + (Int(textValue3) ?? 0) } .map { $0.description } .bind(to: result.rx.text) .disposed(by: disposeBag) } } https://github.com/ReactiveX/RxSwift/tree/master/RxExample/RxExample/Examples/Numbers

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Observable .combineLatest { Int($0)+ … } “1” “3” “2” 6 number1.rx.text.orEmpty number2.rx.text.orEmpty number3.rx.text.orEmpty

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Observable .combineLatest { Int($0)+ … } 6 .map { $0.description } “6”

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Observable .combineLatest { Int($0)+ … } “1” “3” “2” 6 “6” 10

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Observable .combineLatest { Int($0)+ … } “1” “3” “2” 6 “6” 10 “” 7

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letswift(17) Observable

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ImagePickerController https://github.com/ReactiveX/RxSwift/tree/master/RxExample/RxExample/Examples/ImagePicker

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ImagePickerController cameraButton.rx.tap .flatMapLatest { [weakself] _ in return UIImagePickerController.rx.createWithParent(self) { picker in picker.sourceType = .camera picker.allowsEditing = false } .flatMap { $0.rx.didFinishPickingMediaWithInfo } .take(1) } .map { info in return info[UIImagePickerControllerOriginalImage] as? UIImage } .bind(to: imageView.rx.image) .disposed(by: disposeBag)

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extension Reactive whereBase: UIImagePickerController { static func createWithParent( _ parent: UIViewController?, animated: Bool = true, configureImagePicker: @escaping (UIImagePickerController) throws -> () = { x in } ) -> Observable<UIImagePickerController> { return Observable.create { [weak parent] observer in let imagePicker = UIImagePickerController() let dismissDisposable = … do { try configureImagePicker(imagePicker) } catch let error { observer.on(.error(error)) return Disposables.create() } guard let parent = parent else { observer.on(.completed) return Disposables.create() } parent.present(imagePicker, animated: animated, completion: nil) observer.on(.next(imagePicker)) return Disposables.create(dismissDisposable, Disposables.create { dismissViewController(imagePicker, animated: animated) }) } } }

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extension Reactive whereBase: UIImagePickerController { static func createWithParent( _ parent: UIViewController?, animated: Bool = true, configureImagePicker: @escaping (UIImagePickerController) throws -> () = { x in } ) -> Observable<UIImagePickerController> { return Observable.create { [weak parent] observer in let imagePicker = UIImagePickerController() let dismissDisposable = … do { try configureImagePicker(imagePicker) } catch let error { observer.on(.error(error)) return Disposables.create() } guard let parent = parent else { observer.on(.completed) return Disposables.create() } parent.present(imagePicker, animated: animated, completion: nil) observer.on(.next(imagePicker)) return Disposables.create(dismissDisposable, Disposables.create { dismissViewController(imagePicker, animated: animated) }) } } }

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extension Reactive whereBase: UIImagePickerController { /** Reactive wrapper for `delegate` message. */ public var didFinishPickingMediaWithInfo: Observable<[String : AnyObject]> { return delegate .methodInvoked(#selector(UIImagePickerControllerDelegate.imagePickerController(_:didFin ishPickingMediaWithInfo:))) .map({ (a) in return try castOrThrow(Dictionary<String, AnyObject>.self, a[1]) }) } /** Reactive wrapper for `delegate` message. */ public var didCancel: Observable<()> { return delegate .methodInvoked(#selector(UIImagePickerControllerDelegate.imagePickerControllerDidCancel (_:))) .map {_ in () } } }

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cameraButton.rx.tap .flatMapLatest { [weakself] _ in return UIImagePickerController.rx.createWithParent(self) { picker in picker.sourceType = .camera picker.allowsEditing = false } .flatMap { $0.rx.didFinishPickingMediaWithInfo } .take(1) } .map { info in return info[UIImagePickerControllerOriginalImage] as? UIImage } .bind(to: imageView.rx.image) .disposed(by: disposeBag)

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cameraButton.rx.tap .flatMapLatest { [weakself] _ in return UIImagePickerController.rx.createWithParent(self) { picker in picker.sourceType = .camera picker.allowsEditing = false } } .map { info in return info[UIImagePickerControllerOriginalImage] as? UIImage } .bind(to: imageView.rx.image) .disposed(by: disposeBag)

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cameraButton.rx.tap .flatMapLatest { [weakself] _ in return UIImagePickerController.rx.createWithParent(self) { picker in picker.sourceType = .camera picker.allowsEditing = false } } .bind(to: imageView.rx.image) .disposed(by: disposeBag)

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letswift(17) UIBindingObserver, ControlEvent, ControlProperty

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UIBindingObserver • setter •error • Mainthread binding

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extension Reactive whereBase: UIImageView { public var image: UIBindingObserver<Base, UIImage?> { return image(transitionType: nil) } public func image(transitionType: String? = nil) -> UIBindingObserver<Base, UIImage?> { return UIBindingObserver(UIElement: base) { imageView, image in … imageView.image = image } } }

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public final classUIBindingObserver<UIElementType, Value> : ObserverType where UIElementType: AnyObject { public typealias E = Value weak var UIElement: UIElementType? let binding: (UIElementType, Value) -> Void /// Initializes `ViewBindingObserver` using public init(UIElement: UIElementType, binding: @escaping (UIElementType, Value) -> Void) { self.UIElement = UIElement self.binding = binding } /// Binds next element to owner view as described in `binding`. public func on(_ event: Event<Value>) { if !DispatchQueue.isMain { DispatchQueue.main.async { self.on(event) } return } switch event { case .next(let element): if let view = self.UIElement { binding(view, element) } case .error(let error): bindingErrorToInterface(error) case .completed: break } } }

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public final classUIBindingObserver<UIElementType, Value> : ObserverType where UIElementType: AnyObject { public typealias E = Value weak var UIElement: UIElementType? let binding: (UIElementType, Value) -> Void /// Initializes `ViewBindingObserver` using public init(UIElement: UIElementType, binding: @escaping (UIElementType, Value) -> Void) { self.UIElement = UIElement self.binding = binding } /// Binds next element to owner view as described in `binding`. public func on(_ event: Event<Value>) { if !DispatchQueue.isMain { DispatchQueue.main.async { self.on(event) } return } switch event { case .next(let element): if let view = self.UIElement { binding(view, element) } case .error(let error): bindingErrorToInterface(error) case .completed: break } } }

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ControlEvent • getter •, • completed • Mainthread

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extension Reactive whereBase: UIButton { public var tap: ControlEvent<Void> { return controlEvent(.touchUpInside) } } extension Reactive where Base: UIControl { public func controlEvent(_ controlEvents: UIControlEvents) -> ControlEvent<Void> { let source: Observable<Void> = Observable.create { [weak control = self.base] observer in MainScheduler.ensureExecutingOnScheduler() guard let control = control else { observer.on(.completed) return Disposables.create() } let controlTarget = ControlTarget(control: control, controlEvents: controlEvents) { control in observer.on(.next()) } return Disposables.create(with: controlTarget.dispose) }.takeUntil(deallocated) return ControlEvent(events: source) }

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public struct ControlEvent<PropertyType>: ControlEventType { public typealias E = PropertyType let _events: Observable<PropertyType> /// Initializes control event with a observable sequence that represents events. /// /// - parameter events: Observable sequence that represents events. /// - returns: Control event created with a observable sequence of events. public init<Ev: ObservableType>(events: Ev) where Ev.E == E { _events = events.subscribeOn(ConcurrentMainScheduler.instance) } /// Subscribes an observer to control events. /// /// - parameter observer: Observer to subscribe to events. /// - returns: Disposable object that can be used to unsubscribe the observer from receiving control events. public func subscribe<O : ObserverType>(_ observer: O) -> Disposable where O.E == E { return _events.subscribe(observer) } /// - returns: `Observable` interface. public func asObservable() -> Observable<E> { return _events } /// - returns: `ControlEvent` interface. public func asControlEvent() -> ControlEvent<E> { return self } }

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public struct ControlEvent<PropertyType>: ControlEventType { public typealias E = PropertyType let _events: Observable<PropertyType> /// Initializes control event with a observable sequence that represents events. /// /// - parameter events: Observable sequence that represents events. /// - returns: Control event created with a observable sequence of events. public init<Ev: ObservableType>(events: Ev) where Ev.E == E { _events = events.subscribeOn(ConcurrentMainScheduler.instance) } /// Subscribes an observer to control events. /// /// - parameter observer: Observer to subscribe to events. /// - returns: Disposable object that can be used to unsubscribe the observer from receiving control events. public func subscribe<O : ObserverType>(_ observer: O) -> Disposable where O.E == E { return _events.subscribe(observer) } /// - returns: `Observable` interface. public func asObservable() -> Observable<E> { return _events } /// - returns: `ControlEvent` interface. public func asControlEvent() -> ControlEvent<E> { return self } }

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ControlProperty • setter +getter • a.k.a. UIBindingObserver + Observable • element shareReplay(1)

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extension Reactive whereBase: LikeButton { var isLiked: ControlProperty<Bool> { let source: Observable<Bool> = Observable.deferred { [weak button = self.base] in guard let isSelected = button?.isSelected else { return .empty() } return Observable.just(isSelected) } let bindingObserver = UIBindingObserver(UIElement: self.base) { (button, isSelected: Bool) in button.isSelected = isSelected button.tintColor = isSelected ? .colorSelected : .colorNormal } return ControlProperty(values: source, valueSink: bindingObserver) } }

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public struct ControlProperty<PropertyType>: ControlPropertyType { public typealias E = PropertyType let _values: Observable<PropertyType> let _valueSink: AnyObserver<PropertyType> public init<V: ObservableType, S: ObserverType>(values: V, valueSink: S) where E == V.E, E == S.E { _values = values.subscribeOn(ConcurrentMainScheduler.instance) _valueSink = valueSink.asObserver() } public func subscribe<O : ObserverType>(_ observer: O) -> Disposable where O.E == E { return _values.subscribe(observer) } public var changed: ControlEvent<PropertyType> { get { return ControlEvent(events: _values.skip(1)) } } … public func on(_ event: Event<E>) { switch event { case .error(let error): bindingErrorToInterface(error) case .next: _valueSink.on(event) case .completed: _valueSink.on(event) } } }

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public struct ControlProperty<PropertyType>: ControlPropertyType { public typealias E = PropertyType let _values: Observable<PropertyType> let _valueSink: AnyObserver<PropertyType> public init<V: ObservableType, S: ObserverType>(values: V, valueSink: S) where E == V.E, E == S.E { _values = values.subscribeOn(ConcurrentMainScheduler.instance) _valueSink = valueSink.asObserver() } public func subscribe<O : ObserverType>(_ observer: O) -> Disposable where O.E == E { return _values.subscribe(observer) } public var changed: ControlEvent<PropertyType> { get { return ControlEvent(events: _values.skip(1)) } } … public func on(_ event: Event<E>) { switch event { case .error(let error): bindingErrorToInterface(error) case .next: _valueSink.on(event) case .completed: _valueSink.on(event) } } }

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letswift(17) Disposing

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Disposing let scheduler =SerialDispatchQueueScheduler(qos: .default) let subscription = Observable<Int>.interval(0.3, scheduler: scheduler) .subscribe { event in print(event) } Thread.sleep(forTimeInterval: 2.0) subscription.dispose()

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Disposing cameraButton.rx.tap .flatMapLatest { [weakself] _ in return UIImagePickerController.rx.createWithParent(self) { picker in picker.sourceType = .camera picker.allowsEditing = false } .flatMap { $0.rx.didFinishPickingMediaWithInfo } .take(1) } .map { info in return info[UIImagePickerControllerOriginalImage] as? UIImage } .bind(to: imageView.rx.image) .disposed(by: disposeBag)

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Disposing extension Reactive whereBase: UIButton { public var tap: ControlEvent<Void> { return controlEvent(.touchUpInside) } } extension Reactive where Base: UIControl { public func controlEvent(_ controlEvents: UIControlEvents) -> ControlEvent<Void> { let source: Observable<Void> = Observable.create { [weak control = self.base] observer in MainScheduler.ensureExecutingOnScheduler() guard let control = control else { observer.on(.completed) return Disposables.create() } let controlTarget = ControlTarget(control: control, controlEvents: controlEvents) { control in observer.on(.next()) } return Disposables.create(with: controlTarget.dispose) }.takeUntil(deallocated) return ControlEvent(events: source) }

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letswift(17) Debugging

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Debugging cameraButton.rx.tap.debug(“Tap the button”) .flatMapLatest{ [weak self] _ in return UIImagePickerController.rx.createWithParent(self) { picker in picker.sourceType = .camera picker.allowsEditing = false }.debug(“Create with parent”) .flatMap { $0.rx.didFinishPickingMediaWithInfo.debug(“mediaWithInfo”) } .debug(“mediaWithInfo out of flatMap”) .take(1) } .map { info in return info[UIImagePickerControllerOriginalImage] as? UIImage }.debug(“image”) .bind(to: imageView.rx.image) .disposed(by: disposeBag)

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Debugging // 2017-09-23 10:19:37.986: image-> subscribed 2017-09-23 10:19:37.987: Tap the button -> subscribed // 2017-09-23 10:19:39.433: Tap the button -> Event next(()) 2017-09-23 10:19:39.434: mediaWithInfo out of flatMap -> subscribed 2017-09-23 10:19:39.434: Create with parent -> subscribed 2017-09-23 10:19:39.684: Create with parent -> Event next(UIImagePickerController) 2017-09-23 10:19:39.685: mediaWithInfo -> subscribed 2017-09-23 10:19:45.525: mediaWithInfo -> Event next([“…”]) 2017-09-23 10:19:45.525: image -> Event next(UIImage) 2017-09-23 10:19:45.525: mediaWithInfo out of flatMap -> isDisposed 2017-09-23 10:19:45.525: Create with parent -> isDisposed 2017-09-23 10:19:45.526: mediaWithInfo -> isDisposed

88.
letswift(17)

89.
ﬂatMap vs. withLatestFrom letbuttonTap = Observable.just(Void()) let flag = Observable<Int>.interval(10, scheduler: scheduler) .map { _ in rand() % 2 == 0 } .startWith(true) buttonTap.flatMap { _ in flag } .debug("flatMap") .subscribe() buttonTap.withLatestFrom(flag) .debug("withLatestFrom") .subscribe() 2017-09-23 14:27:03.788: flatMap -> subscribed 2017-09-23 14:27:03.793: flatMap -> Event next(true) 2017-09-23 14:27:03.795: withLatestFrom -> subscribed 2017-09-23 14:27:03.796: withLatestFrom -> Event next(true) 2017-09-23 14:27:03.796: withLatestFrom -> Event completed 2017-09-23 14:27:03.796: withLatestFrom -> isDisposed 2017-09-23 14:27:13.793: flatMap -> Event next(false) 2017-09-23 14:27:23.794: flatMap -> Event next(true)

90.
.just() and .share() letobservable = Observable.just("Hello, RxSwift!").share() observable .debug("Observable") .subscribe() observable .debug("Observable2") .subscribe() 2017-09-23 13:56:48.347: Observable -> subscribed 2017-09-23 13:56:48.349: Observable -> Event next(Hello, RxSwift!) 2017-09-23 13:56:48.350: Observable -> Event completed 2017-09-23 13:56:48.350: Observable -> isDisposed 2017-09-23 13:56:48.352: Observable2 -> subscribed 2017-09-23 13:56:48.353: Observable2 -> Event completed 2017-09-23 13:56:48.353: Observable2 -> isDisposed

91.
subscribe

93.
letswift(17)

RxSwift 활용하기 - Let'Swift 2017

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