RxSwift 와 Combine

Combine 2019. 7. 26. 15:21
반응형

원문 : https://medium.com/gett-engineering/rxswift-to-apples-combine-cheat-sheet-e9ce32b14c5b

Basics

  RxSwift Combine
Deployment Target iOS 8.0+ iOS 13.0+
Platforms supported iOS, macOS, tvOS, watchOS, Linux iOS, macOS, tvOS, watchOS, UIKit for Mac 
Spec Reactive Extensions (ReactiveX) Reactive Streams (+ adjustments)
Framework Consumption Third-party First-party (built-in)
Maintained by Open-Source / Community Apple
UI Bindings RxCocoa SwiftUI 

 

Core Components

RxSwift Combine Note
AnyObserver AnySubscriber  
BehaviorRelay Simple wrapper around BehaviorSubject, could be easily recreated in Combine
BehaviorSubject CurrentValueSubject This seems to be the type that holds @State under the hood
Completable  
CompositeDisposable  
ConnectableObservableType ConnectablePublisher  
Disposable Cancellable  
DisposeBag A collection of AnyCancellables Call anyCancellable.store(in: collection), where collection can be an array, a set, or any other RangeReplaceableCollection
Driver BindableObject (SwiftUI) Both guarantee no failure, but Driver guarantees delivery on Main Thread. In Combine, SwiftUI recreates the entire view hierarachy on the Main Thread, instead.
Maybe Publishers.Optional  
Observable Publisher  
Observer Subscriber  
PublishRelay Simple wrapper around PublishSubject, could be easily recreated in Combine
PublishSubject PassthroughSubject  
ReplaySubject  
ScheduledDisposable  
SchedulerType Scheduler  
SerialDisposable  
Signal  
Single Future They're only similar in the sense of single emission, but Future shares resources and executes immediately (very strange behavior)
SubjectType Subject  
TestScheduler There doesn't seem to be an existing testing scheduler for Combine code

 

Operators

RxSwift Combine Notes
amb()  
asObservable() eraseToAnyPublisher()  
asObserver()  
bind(to:) `assign(to:on:)` Assign uses a KeyPath which is really nice and useful. RxSwift needs a Binder / ObserverType to bind to.
buffer buffer  
catchError catch  
catchErrorJustReturn replaceError(with:)  
combineLatest combineLatest, tryCombineLatest  
compactMap compactMap, tryCompactMap  
concat append, prepend  
concatMap  
create Apple removed AnyPublisher with a closure in Xcode 11 beta 3 :-(
debounce debounce  
debug print  
deferred Publishers.Deferred  
delay delay  
delaySubscription  
dematerialize  
distinctUntilChanged removeDuplicates, tryRemoveDuplicates  
do handleEvents  
elementAt output(at:)  
empty Publishers.Empty(completeImmediately: true)  
enumerated  
error Publishers.Fail  
filter filter, tryFilter  
first first, tryFirst  
flatMap flatMap  
flatMapFirst  
flatMapLatest switchToLatest  
from  
groupBy  
ifEmpty(default:) replaceEmpty(with:)  
ifEmpty(switchTo:) Could be achieved with composition - replaceEmpty(with: publisher).switchToLatest()
ignoreElements ignoreOutput  
interval  
just Just  
map map, tryMap  
materialize  
merge merge, tryMerge  
merge(maxConcurrent:) flatMap(maxPublishers:)  
multicast multicast  
never Publishers.Empty(completeImmediately: false)  
observeOn receive(on:)  
of Sequence.publisher `publisher` property on any `Sequence` or you can use `Publishers.Sequence(sequence:)` directly
publish makeConnectable  
range  
reduce reduce, tryReduce  
refCount autoconnect  
repeatElement  
retry, retry(3) retry, retry(3)  
retryWhen  
sample  
scan scan, tryScan  
share share There’s no replay or scope in Combine. Could be “faked” with multicast.
skip(3) dropFirst(3)  
skipUntil drop(untilOutputFrom:)  
skipWhile drop(while:), tryDrop(while:)  
startWith prepend  
subscribe sink  
subscribeOn subscribe(on:) RxSwift uses Schedulers. Combine uses RunLoop, DispatchQueue, and OperationQueue.
takeLast last  
takeUntil prefix(untilOutputFrom:)  
throttle throttle  
timeout timeout  
timer Timer.publish  
toArray() collect()  
window collect(Publishers.TimeGroupingStrategy) Combine has a TimeGroupingStrategy.byTimeOrCount that could be used as a window.
withLatestFrom  
zip zip  

 

반응형
Posted by 까칠코더
,