reactivecocoa - tdc 2016
TRANSCRIPT
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
