Rx Swift
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Rx is a generic abstraction of computation expressed through Observable<Element> interface, which lets you broadcast and subscribe to values and other events from an Observable stream.
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Rx Swift
- 1. RxSwift The Power in your fingers Favara Vincenzo
- 2. UI interactions between event and validations UI Witch db use depending of your operations Data Storage Thinking as modular architecture to manage the app complexity Architecture Sometimes network calls need to be triggered in cascade Networking Starting new Mobile App project What’s the most relevant troubles starting a new mobile app?
- 3. Architecture complexity Apple SDK offers a huge variety of APIs Using Delegates requires you to adopt different patterns for notifications, closures, callbacks...
- 4. Rx heros family are here for you. They offer an alternative approach that is both clear and concise, to manage asynchronous tasks and events. Acting to the configuration way instead to classic way ReactiveX Heros ReactiveX is a library for composing asynchronous events by using observable sequences. RxJava RxJs RxSwift RxPHP Rx.NET RxKotlin
- 5. Hello! Let me introduce myself rxswift.slack.com @rxswift I am Ironman “I am a reactive programming library for iOS. I make it easy to program dynamic apps that respond to data changes and user events by using observables.” github.com/ReactiveX/RxSwift
- 6. Simplified Multi-thread Switching Main/Backgrounds threads in one line Multi platform Rx exists for the most used languages Huge communities Communities are actives in socials too Everything is observable Observable is a asynchronous sequence Composable & Reusable composed by structures and operators Async is Declarative definitions are immutable, data changes Rx SuperPowers Infinity gountlet in your hand!
- 7. What’s an Observable? It’s a async sequence or stream of emitted items Subscription Events: - onNext - onError - onComplete
- 8. Composable & Reusable RxSwift provides Structures and Operators ● The structures provide different ways of publishing information. ● The operations transform, decorate, compose, etc, the information. You can check here: http://reactivex.io/documentation/operators.html
- 9. PublishSubject Start empty Emit new next event to new subscribers ReplaySubject Start empty with a buffer size Replays buffer to new subscribers BehaviorSubject Start with initial value Replays initial / latest value to new subscribers Structures Different ways of publishing information
- 10. Create Transform Filter Combine Error Utility Operators Some of category operators ● create ● just ● from ● flatMap ● map ● groupBy ● filter ● distinct ● ignoreElements ● combineLatest ● merge ● zip ● catch ● retry ● subscribe ● observeOn ● delay http://reactivex.io/documentation/operators.html
- 11. Async is Declarative Definitions are immutable, data changes Declarative code enables you to describe a complex async workflow at a high level in a few lines passing from traditional nested callbacks, delegates, notifications, kvo, etc to a configured data steps Tap stream Items stream Response stream Request stream
- 12. Simplified Multi-threading Switching on different threads is easier There are situations in which you need to perform tasks in different threads. You can easy listen to an event on the main thread and react in background and switch back to the main thread to show the results. Tap stream Items stream Response stream Request stream observeOn( .background) observeOn( .main)
- 13. Reactive programming is a way of working, it’s a design pattern, or a set of them for all that matters. The same standardisation comes in different languages and platforms. So If you learn Reactive Programming in Swift, you can take it with you to another platform and language. Multi-platform Rx is different languages with a huge community. RxJava RxSwift RxJs Rx.NET UniRx RxScala RxCpp RxLua Rx.rb RxPY RxGo RxGroovy RxKotlin RxDart RxPHP http://reactivex.io/languages.html
- 14. RxSwift world is huge so you can have some troubles during your way. Here there are the most dangerous problems you can find Wrong superpower use With great power comes great responsibility Learning curve The learning process is intimidating at the beginning. Memory leak Be careful with self references inside closures Debugging Stack traces are a lot bigger, It’s hard to find crash/bug reasons Abusing Don’t use for everything if you don’t need it
- 15. Avoid Memory leak Avoid the strong reference cycle inside closures If the closure is owned by scope and not by the class (example: in-line closures) you do not have to use [weak self] because it will be released when the scope is left. If the closure is passed in it may or may not be owned by the class (a property for example) and it is prudent to use [weak self] incase it is owned by the class.
- 16. Debugging in RxSwift Is it possible debug easy? First: What is a Fast-Fish? Alive or dead a fish is technically fast, when it is connected with an occupied ship or boat.
- 17. Let’s code... Try to write an example { }
- 18. Use Cases Using RxSwift in a common use cases: - Perform and display a research - Connect a single api call to two distinct collections - Set up a chat gui
- 19. Call BE after 300ms each time type a new letter and in the case cancel previous call For each result found create a cell in the table view if exist value When you create an ios app with a search toolbar, you are going to solve some common problems like calling BE after waiting time and display results in a table view Search and results Try to figure out the problem in the use case
- 20. RxSwift Operators: - debounce - distinct - observeOn - flatMap - bind - dispose
- 21. When you create an ios app with more than one only collection view, you could have necessity to split your retrieved data to both collection view - Steps: ● Retrieve Data Movie with all own actors inside ● Save Movie on top collection view and all actors in main collection view Two collections Try to figure out the problem in the use case
- 22. RxSwift Operators: - observeOn - flatMap - share - bind - dispose
- 23. Listen for new received messages For each one put a dots cell before it appears disabling user input sending When you create an ios app with a chat system inside, you are going to solve some common problems like the messages retrieving and receiving Messages in a chat Try to figure out the problem in the use case
- 24. RxSwift Operators: - observeOn - map - concatMap - delay - flatMap - dispose
- 26. 95% WRITE A TITLE HERE First: What is a Fast-Fish? Alive or dead a fish is technically fast, when it is connected with an occupied ship or boat, by any medium at all controllable by the occupant oR Pratics Reactive thinking way Studying RxSwift components and operators You want to refactor yesterday’s code Personal Experience What I learned and what’s my feeling about RxSwift