Concept

Combine provides a way to emit values at regular time intervals using:

Timer.publish

This creates a publisher that emits values continuously over time.

Unlike publishers like Just or arrays, a Timer publisher produces an infinite stream.

Creating a Timer Publisher

let timerPublisher = Timer
    .publish(every: 1.0, on: .main, in: .common)

Parameters:

every → time interval (seconds)
on → run loop (usually .main)
in → run loop mode

This only creates the publisher — it does not start emitting yet.

Starting the Timer

To begin emitting values:

.autoconnect()

Example:

let timerPublisher = Timer
    .publish(every: 1.0, on: .main, in: .common)
    .autoconnect()

This automatically connects and starts the timer.

Example Pipeline