reactivecocoa - tdc 2016

REACTIVE COCOATrilha iOS

Carlos Vinícius Real Guilherme EndresSoftware Engineer Software Engineer

ReactiveCocoa?

ISSO NÃO VAI DAR CERTO…

RAC

IOS

ReactiveCocoa?

Functional Reactive Programming

Reactive Cocoa

Reactive Programming +

Functional Programming

Reactive Cocoa

Reactive Programming +

Functional Programming

Reactive Cocoa

Reactive Programming

Reactive Programming +

Functional Programming

Reactive Cocoa

Functional Programming

Imperativo vs Declarativo

FRP | Imperativo

Como

var strongBeers = [Beer]();

for beer in beers {

if beer.alcohoolPercent > 6 {

strongBeers.append(beer)

}

}

FRP | Declarativo

O que

beers.filter{ $0.alcohoolPercent > 6 }

SIGNALS &

SIGNALS PRODUCERS

Weiss

map

filter

RedAle

http://neilpa.me/rac-marbles

EVENTS

Events

Next

Completed

Failed

Interrupted

CallBack blocks

KVO

Actions

Delegate

NSNOTIFICATION

CODE

CODE

Swift

ReactiveCocoa4

MVVM

BUTTON SIGNAL

let buttonSignal: RACSignal = enterButton.rac_signalForControlEvents( UIControlEvents.TouchUpInside)

USERVIEWCONTROLLER | BUTTON SIGNAL

let buttonSignal: RACSignal = enterButton.rac_signalForControlEvents( UIControlEvents.TouchUpInside)

let buttonSignalProducer: SignalProducer = buttonSignal .toSignalProducer() .observeOn(UIScheduler())

USERVIEWCONTROLLER | BUTTON SIGNAL PRODUCER

OPERATORS

buttonSignalProducer

.flatMap(

transform:)

USERVIEWCONTROLLER | OPERATORS

buttonSignalProducer

.flatMap(FlattenStrategy.Latest,

transform: userViewModel.saveUser)

USERVIEWCONTROLLER | OPERATORS

buttonSignalProducer

.flatMap(FlattenStrategy.Latest,

transform: userViewModel.saveUser)

.startWithNext { username in

self.performSegueWithIdentifier("beerControllerSegue", sender: self)

}

USERVIEWCONTROLLER | OPERATORS

MUTABLE PROPERTY

var quantity = MutableProperty<Int>(0)

var userImage = MutableProperty<UIImage?>.init(defaultImage)

BEERVIEWMODEL | MUTABLE PROPERTIES

BINDING<~

beerViewModel.quantity <~ beerQuantityProducer

BEERVIEWCONTROLLER | BINDING

MÉTODOS

func imageForBeer(quantity: Int) -> SignalProducer<UIImage?, NoError> {

}

BEERVIEWMODEL | MÉTODOS

func imageForBeer(quantity: Int) -> SignalProducer<UIImage?, NoError> { return SignalProducer { observe, disposable in

}.delay(1, onScheduler: QueueScheduler.mainQueueScheduler) }

BEERVIEWMODEL | MÉTODOS

func imageForBeer(quantity: Int) -> SignalProducer<UIImage?, NoError> { return SignalProducer { observe, disposable in guard let image: UIImage = imageForQuantity(quantity) else { print("Failed to get image for quantity \(quantity)") return }

}.delay(1, onScheduler: QueueScheduler.mainQueueScheduler) }

BEERVIEWMODEL | MÉTODOS

func imageForBeer(quantity: Int) -> SignalProducer<UIImage?, NoError> { return SignalProducer { observe, disposable in guard let image: UIImage = imageForQuantity(quantity) else { print("Failed to get image for quantity \(quantity)") return } observe.sendNext(image) }.delay(1, onScheduler: QueueScheduler.mainQueueScheduler) }

BEERVIEWMODEL | MÉTODOS

userImage <~ quantity.producer

BEERVIEWMODEL | BINDING

userImage <~ quantity.producer .skipRepeats()

BEERVIEWMODEL | BINDING

userImage <~ quantity.producer .skipRepeats() .flatMap(FlattenStrategy.Latest, transform: imageForBeer)

BEERVIEWMODEL | BINDING

personDrunkImage.rac_image <~ beerViewModel.userImage

BEERVIEWCONTROLLER | BINDING

UNIT TEST

let userViewModel: UserViewModel = UserViewModel()

UNIT TEST | SUCESSO

let userViewModel: UserViewModel = UserViewModel()

userViewModel.username.value = "Skywalker"

UNIT TEST | SUCESSO

let userViewModel: UserViewModel = UserViewModel()

userViewModel.username.value = "Skywalker"

userViewModel.saveUser().on( ).start()

UNIT TEST | SUCESSO

let userViewModel: UserViewModel = UserViewModel()

userViewModel.username.value = "Skywalker"

userViewModel.saveUser().on( completed: { successExpectation.fulfill() }, failed: { error in XCTFail() }).start()

UNIT TEST | SUCESSO

let userViewModel: UserViewModel = UserViewModel()

userViewModel.username.value = "Darth Vader"

userViewModel.saveUser().on( completed: {

XCTFail() }, failed: { error in successExpectation.fulfill() }).start()

UNIT TEST | FALHA

PROBLEMAS

https://github.com/username/project

Signals

Signal Producer

Map

Functional programming

"Se liga no mestiço, na batida do cavaco"?

Reactive

Reduce

Links úteis | Reactive Cocoa

http://reactivecocoa.io/philosophy.html

https://github.com/ReactiveCocoa/ReactiveCocoa

http://www.sprynthesis.com/2014/12/06/reactivecocoa-mvvm-

introduction/

https://nomothetis.svbtle.com/an-introduction-to-reactivecocoa

http://neilpa.me/rac-marbles

https://github.com/gfendres/ractdc2016

CVINICIUSREAL@GMAIL.COM

Carlos Vinícius Real Guilherme EndresGFENDRES@GMAIL.COM