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Reactive programming with RxSwift
The document provides an overview of reactive programming with RxSwift, defining it as a declarative paradigm focused on data streams and change propagation. It compares different reactive frameworks for Swift and Objective-C, outlining RxSwift's features such as observables, subscription methods, and handling of errors. Additionally, it discusses the pros and cons of using RxSwift in UI architectures along with a brief mention of its demo project.
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Reactive programming with RxSwift
- 1. Reactive programming with RxSwift OleksandrStepanov iOS developer @Kromtech
- 2. 01 What isreactive programming TABLE OF CONTENTS 02 Frameworks for Swift & Obj-C 03 RxSwift basics 04 RxSwift/RxCocoa examples and demo
- 3. ⼀一 Wikipedia “Reactive programmingis a declarative programming paradigm concerned with data streams and the propagation of change.”
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- 5. Reactive frameworks forSwift / Objective-C ReactiveCocoa RxSwift
- 6. ReactiveCocoa vs RxSwift ●Hot vs Cold producers/observables ○ RAC: Signal & SignalProducer ○ RxSwift: Observable ● Typed errors ○ RAC: Strictly typing ○ RxSwift: Swift.Error confirmance ● UI bindings ○ + RxSwift ● Objective-C support ○ + RAC (ReactiveObjC)
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- 9. ● Observer subscribesto an Observable. ● Each subscription starts with .subscribe(...) ● Each subscription must be disposed
- 10. Subscribe consist of: ●onNext is called when Observable emits an item ● onError Observable failed, and it will stop emitting ● onComplete Observable will not emit anything more
- 11. Subscription termination withDisposable ● Subscribe function returns Disposable ● Recommended practice is not to dispose it manually, but use DisposeBag entity instead ● onDispose callback called just before dispose
- 18. Subjects “A Subject isa sort of bridge or proxy that acts both as an оbserver and as an Observable”
- 22. Relays ● Relays nevercomplete and never errors ● Part of RxRelay framework ● PublishRelay and BehaviorRelay available
- 23. Schedulers ● Multithreading conceptfor Rx ● By default, an Observable and the chain of operators that you apply to it will do its work and will notify its observers on the same thread on which its Subscribe method is called. ● subscribeOn() and observeOn()
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- 32. SHOW ME THECODE! It’s demo time
- 33. Pros ● Declarative codeinstead of imperative ● Observable pattern on steroids ● Must have for popular UI architectures nowadays (MVVM, VIPER, RIBs etc.)
- 34. Cons ● Reduced performance(increased call stack) ● Hard to debug ● IDE syntax highlight stuck regularly
- 36. References ● ReactiveX ● RxSwiftgetting started ● Demo project (MVVM+Router)
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