Generic Instance Method


Specifies the scheduler on which to receive elements from the publisher.


func receive<S>(on scheduler: S, options: S.SchedulerOptions? = nil) -> Publishers.ReceiveOn<Publishers.Concatenate<Prefix, Suffix>, S> where S : Scheduler



The scheduler the publisher is to use for element delivery.


Scheduler options that customize the element delivery.

Return Value

A publisher that delivers elements using the specified scheduler.


You use the receive(on:options:) operator to receive results on a specific scheduler, such as performing UI work on the main run loop. In contrast with subscribe(on:options:), which affects upstream messages, receive(on:options:) changes the execution context of downstream messages. In the following example, requests to jsonPublisher are performed on backgroundQueue, but elements received from it are performed on RunLoop.main.

let jsonPublisher = MyJSONLoaderPublisher() // Some publisher.
let labelUpdater = MyLabelUpdateSubscriber() // Some subscriber that updates the UI.

    .subscribe(on: backgroundQueue)
    .receiveOn(on: RunLoop.main)

Beta Software

This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.

Learn more about using Apple's beta software