<!--
{
  "availability" : [
    "iOS: 13.0.0 -",
    "iPadOS: 13.0.0 -",
    "macCatalyst: 13.0.0 -",
    "macOS: 10.15.0 -",
    "tvOS: 13.0.0 -",
    "visionOS: 1.0.0 -",
    "watchOS: 6.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "Combine",
  "identifier" : "/documentation/Combine/ImmediateScheduler",
  "metadataVersion" : "0.1.0",
  "role" : "Structure",
  "symbol" : {
    "kind" : "Structure",
    "modules" : [
      "Combine"
    ],
    "preciseIdentifier" : "s:7Combine18ImmediateSchedulerV"
  },
  "title" : "ImmediateScheduler"
}
-->

# ImmediateScheduler

A scheduler for performing synchronous actions.

```
struct ImmediateScheduler
```

## Overview

You can only use this scheduler for immediate actions. If you attempt to schedule actions after a specific date, this scheduler ignores the date and performs them immediately.

## Topics

### Declaring scheduler timekeeping and options

[`ImmediateScheduler.SchedulerTimeType`](/documentation/Combine/ImmediateScheduler/SchedulerTimeType)

The time type used by the immediate scheduler.

[`ImmediateScheduler.SchedulerOptions`](/documentation/Combine/ImmediateScheduler/SchedulerOptions)

A type that defines options accepted by the immediate scheduler.

### Accessing scheduler time properties

[`minimumTolerance`](/documentation/Combine/ImmediateScheduler/minimumTolerance)

The minimum tolerance allowed by the immediate scheduler.

[`now`](/documentation/Combine/ImmediateScheduler/now)

The immediate scheduler’s definition of the current moment in time.

### Using the shared scheduler

[`shared`](/documentation/Combine/ImmediateScheduler/shared)

The shared instance of the immediate scheduler.

### Scheduling actions

[`schedule(after:interval:tolerance:options:_:)`](/documentation/Combine/ImmediateScheduler/schedule(after:interval:tolerance:options:_:))

Performs the action at some time after the specified date, at the specified frequency, optionally taking into account tolerance if possible.

[`schedule(after:tolerance:options:_:)`](/documentation/Combine/ImmediateScheduler/schedule(after:tolerance:options:_:))

Performs the action at some time after the specified date.

[`schedule(options:_:)`](/documentation/Combine/ImmediateScheduler/schedule(options:_:))

Performs the action at the next possible opportunity.


---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)