Unit testing Combine-based Swift code | Swift by Sundell
Articles, podcasts and news about Swift development, by John Sundell. Testing asynchronous code is often particularly tricky, and code written using Apple’s Combine framework is no exception. Since each XCTest-based unit test executes in a purely synchronous fashion, we have to find ways to tell the test runner to await the output of the various asynchronous calls that we’re looking to test — othe
RxSwift to Combine: The Complete Transition Guide
Combine is the new cool kid in town when it comes to reactive programming with Swift, so many developers in the community want to switch from RxSwift to Combine. Both frameworks are very similar, but the devil’s in the details and if you want to make the transition, it really helps to have a clear mapping from all the RxSwift operators, types, and functions to their Combine equivalents. Well, here
Does 'assign(to:)' produce memory leaks?
Hello there! I'm playing around with Combine and I've found a possible memory leak when using 'assign(to:)' to store stream result in current object. Let me show a couple of examples using 'assign(to:)' and 'sink' to compare: final class Bar: ObservableObject { @Published var input: String = "" @Published var output: String = "" private var subscription: AnyCancellable? init() { subscription = $in
[Swift5][Combine]PublisherがFailureを出力した後もストリームを途切れさせない方法の考察 - Qiita
モチベーション Publisherはライフサイクル上、一度Failureを返すと出力をやめてしまいます。 しかし一度Failureを返しても上流から値を流した時に引き続き値を出力し続けて欲しい場面がありました。 今更なトピックスですが、勘違いしてハマったりしたので思考の整理のためにまとめてみました。 PublisherがFailureを返した時の動作 以下のPublisherを使ってその挙動を再現してみます。 受け取った数字が0から3の範囲なら成功 受け取った数字が0から3の範囲外なら失敗 import Combine import Foundation var cancellables = Set<AnyCancellable>() // 引数が3以内なら成功、3以内じゃなければ失敗を返すPublisher func makeLengthCheckPublisher(number: In
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Building custom Combine publishers in Swift | Swift by Sundell
Articles, podcasts and news about Swift development, by John Sundell. Apple’s Combine framework provides a general-purpose abstraction for asynchronous programming, by enabling various values and events to be emitted, transformed and observed over time. Within the world of Combine, an object that emits such asynchronous values and events is called a publisher, and although the framework does ship
Designing API using Combine framework
Designing API using Combine framework 07 Apr 2021 Combine framework provides a declarative Swift API for processing values over time. It allows you to chain, transform and reduce multiple operations. This week we will learn how to design our APIs using the Combine framework to leverage all the data processing power that the framework provides us. Enhancing the Xcode Simulators. Compare designs, sh
Getting started with the Combine framework in Swift
Combine was introduced as a new framework by Apple at WWDC 2019. The framework provides a declarative Swift API for processing values over time and can be seen as a 1st party alternative to popular frameworks like RxSwift and ReactiveSwift. If you’ve been trying out SwiftUI, you’ve likely been using Combine quite a lot already. Types like ObservableObject and Property Wrappers like @Published all
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PassthroughSubject vs. CurrentValueSubject explained
https://obscuredpixels.com/combining-core-data-with-generics
Combining multiple Combine publishers in Swift
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Synchronising Combine's Publishers for easy testing
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A File Download Queue in Combine for Swift
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