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WWDC19

Table of Contents

=================

Combine in Practice - Thursday

Session materials: https://developer.apple.com/videos/play/wwdc2019/721/

This is an example oriented heavy code focused session. Please follow the session materials.

  • Combine has a built in bakc-pressure compared to RxSwift!
  • It doesn't have disposeBags and the allocation is handled automatically
    • There is also a built-in cancel mechanism to terminate an ongoing emmission

@Published

  • A new property wrapper to turn properties into publishers at the same time
    • Similar to Variable<T> or BehaviorRelay<T> on RxSwift
@Published var foo: String
self.foo = 1
let boo = self.foo // Immediately assigns the current value as 1

foo.sink() {
  // subscription stream will get 1 and 2
}

self.foo = "2"

currentValuePublisher()

  • Holds the last emitted value as BehaviorSubject or similar to ReplaySubject in RxSwift

passThroughPublisher()

  • Acts like a bridge from non rx world to rx world. (Similar to publishSubject in RxSwift)

eraseToAnyPublisher

  • casts a given chain into a publisher to be used again across the API

debounce

  • debounces the emission and can schedule on a given thread

removeDuplicates

  • distinctUntilChanged() on Rx

  • There are more than 90 common Rx operators built into Combine!

sink() & assign()

  • subscribe() & bind() on RxSwift to get the emitted value on a subscriber