Reactive Programming in iOS with Combine

Feb 4 2021 · Swift 5.3, macOS 11.0, Xcode 12.2

Part 1: Getting Started

02. Publishers and Subscribers

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Previous episode: 01. Introduction Next episode: 03. Subscriber Operators and Subjects

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00:01Now that you’ve learned some of the basic concepts of Combine, it’s time to jump in and learn about two of Combine’s core components: publishers and subscribers.

example(of: "NotificationCenter") {
  let center = NotificationCenter.default
  let myNotification = Notification.Name("MyNotification")

  let publisher = center
    .publisher(for: myNotification, object: nil)
}

let subscription = publisher
  .sink { _ in
    print("Notification received from a publisher!")
  }

center.post(name: myNotification, object: nil)
subscription.cancel()

——— Example of: Publisher ———
Notification received from a publisher!

.print()

——— Example of: NotificationCenter ———
receive subscription: (NotificationCenter Observer)
request unlimited
receive value: (name = MyNotification, object = nil, userInfo = nil)
Notification received from a publisher!
receive cancel