The Combine framework in Swift offers powerful functions that help you manage data streams efficiently. This article will cover some of the essential Combine functions like receive, dropFirst, map, merge, and combineLatest, showcasing how they can be applied in your projects to transform and manage publisher streams.
For the following examples we are going to use the same Publisher and Set of AnyCancellable. You can try this in a Xcode Playground.
import Combine
var publisher: PassthroughSubject<[Int], Never> = PassthroughSubject()
var bag: Set<AnyCancellable> = Set()
1. receive
The receive operator is used to specify the scheduler on which to receive elements from a publisher. This helps ensure that downstream processing occurs on a particular thread, such as the main thread for UI updates.
publisher
.receive(on: DispatchQueue.main)
.sink { value in
print("Received on main thread: \(value)")
}
.store(in: &bag)
publisher.send(1)
publisher.send(2)
// Output:
// Received on main thread: 1
// Received on main thread: 2
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