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# CMMotionActivity

The data for a single motion update event.

```
class CMMotionActivity
```

## Overview

On devices that support motion, you can use a [`CMMotionActivityManager`](/documentation/CoreMotion/CMMotionActivityManager) or [`CMHeadphoneActivityManager`](/documentation/CoreMotion/CMHeadphoneActivityManager) object to request updates when the current type of motion changes. When a change occurs, the update information is packaged into a [`CMMotionActivity`](/documentation/CoreMotion/CMMotionActivity) object and sent to your app.

The motion-related properties of this class aren’t mutually exclusive. In other words, it’s possible for more than one of the motion-related properties to contain the value <doc://com.apple.documentation/documentation/Swift/true>. For example, if the user was driving in a car and the car stopped at a red light, the update event associated with that change in motion would have both the [`automotive`](/documentation/CoreMotion/CMMotionActivity/automotive) and [`stationary`](/documentation/CoreMotion/CMMotionActivity/stationary) properties set to <doc://com.apple.documentation/documentation/Swift/true>. It’s also possible for all of the properties to be set to <doc://com.apple.documentation/documentation/Swift/false> when the device is in motion but the movement doesn’t correlate to walking, running, cycling, or automotive travel.

You don’t create instances of this class yourself. The [`CMMotionActivityManager`](/documentation/CoreMotion/CMMotionActivityManager) object creates them and sends them to the handler block you registered. For more information about how to initiate the delivery of motion activity updates to your app, see [`CMMotionActivityManager`](/documentation/CoreMotion/CMMotionActivityManager).

## Topics

### Getting the Type of Motion

[`stationary`](/documentation/CoreMotion/CMMotionActivity/stationary)

A Boolean indicating whether the device is stationary.

[`walking`](/documentation/CoreMotion/CMMotionActivity/walking)

A Boolean indicating whether the device is on a walking person.

[`running`](/documentation/CoreMotion/CMMotionActivity/running)

A Boolean indicating whether the device is on a running person.

[`automotive`](/documentation/CoreMotion/CMMotionActivity/automotive)

A Boolean indicating whether the device is in an automobile.

[`cycling`](/documentation/CoreMotion/CMMotionActivity/cycling)

A Boolean indicating whether the device is in a bicycle.

[`unknown`](/documentation/CoreMotion/CMMotionActivity/unknown)

A Boolean indicating whether the type of motion is unknown.

### Getting Metadata for the Motion

[`startDate`](/documentation/CoreMotion/CMMotionActivity/startDate)

The time at which the change in motion occurred.

[`confidence`](/documentation/CoreMotion/CMMotionActivity/confidence)

The confidence in the assessment of the motion type.

[`CMMotionActivityConfidence`](/documentation/CoreMotion/CMMotionActivityConfidence)

The confidence that the motion data is accurate.


---

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