#SWIFT PUBLISHER CODE#

The idea of subscribing a publisher is similar to subscribing for a specific notification from NotificationCenter. In other words, a publisher publishes or emits events that can include values of interest. This protocol defines the requirements for a type to be able to transmit a sequence of values over time to one or more subscribers. Hello PublisherĪt the heart of Combine is the Publisher protocol. They form the foundation of Combine and enable you to send and receive data, typically asynchronously. However, before you begin playing with those examples, you first need to look at publishers, subscribers and subscriptions in a bit more detail. You’ll use this function to encapsulate each example you’ll work on in a playground throughout the book. Print(' - Example of:', description, '-') It contains the following helper function example(of:): public func example(of description: String, Open Sources in the Project navigator ( View ▸ Navigators ▸ Show Project Navigator and twist down the Combine playground page), and select SupportCode.swift. Open ayground in the projects folder and you’ll see the following: Getting startedįor this chapter, you’ll use an Xcode playground with Combine imported. You can compare your work with the final version at the end or along the way if you get stuck.

#SWIFT PUBLISHER CODE#

The starter is ready for you to enter the code for each example and challenge. Note: There are starter and final versions of the playgrounds and projects that you’ll use in each of the chapters in this book. In this chapter, you’ll experiment with various ways to create publishers and subscribe them so that you feel right at home when you need to do so throughout the book. Now that you’ve learned some of the basic concepts of Combine, it’s time to jump in and play with two of Combine’s core components - publishers and subscribers. Custom Publishers & Handling Backpressure 15.7 Subscribing to an external publisher.15.5 Using ObservableObject for model types.15.3 A first taste of managing view state.Section IV: Advanced Combine Section 4: 5 chapters Show chapters Hide chapters 14.3 Multiple stories via merging publishers.14.1 Getting started with the Hacker News API.

12.2 Preparing and subscribing to your own KVO-compliant properties.12.1 Introducing publisher(for:options:).10.3 Using the debugger as a last resort.10.2 Acting on events - performing side effects.9.3 Publishing network data to multiple subscribers.Section III: Combine in Action Section 3: 6 chapters Show chapters Hide chapters 8.3 Wrapping a callback function as a future.8.1 Getting started with “Collage Neue”.Section II: Operators Section 2: 6 chapters Show chapters Hide chapters

Swift publisher