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# LiveActivityForwarding.AccessoryLiveActivitiesHandler

A protocol that defines methods for handling Live Activity life cycle events in your accessory’s data provider extension.

```
protocol AccessoryLiveActivitiesHandler : Sendable
```

## Overview

Implement this protocol to receive forwarded Live Activity content and life cycle updates in your
<doc://com.apple.documentation/documentation/AccessoryTransportExtension/AccessoryDataProvider> extension.

Each `AccessoryLiveActivitiesHandler` object has one corresponding [`LiveActivityForwarding.Session`](/documentation/AccessoryLiveActivities/LiveActivityForwarding/Session).

## Topics

### Managing the session life cycle

[`func activate(for: LiveActivityForwarding.Session)`](/documentation/AccessoryLiveActivities/LiveActivityForwarding/AccessoryLiveActivitiesHandler/activate(for:))

Establishes communication between the data provider extension and the system.

[`func sessionInvalidated()`](/documentation/AccessoryLiveActivities/LiveActivityForwarding/AccessoryLiveActivitiesHandler/sessionInvalidated())

Indicates that the system invalidated the session and stopped sending Live Activity updates.

### Receiving Live Activity updates

[`func activityUpdated(AccessoryLiveActivity)`](/documentation/AccessoryLiveActivities/LiveActivityForwarding/AccessoryLiveActivitiesHandler/activityUpdated(_:))

Provides an updated Live Activity.

[`func activityUpdatedForAlert(AccessoryLiveActivity) -> Bool`](/documentation/AccessoryLiveActivities/LiveActivityForwarding/AccessoryLiveActivitiesHandler/activityUpdatedForAlert(_:))

Provides an updated Live Activity and requests confirmation that the accessory displayed an alert.

### Receiving data from your accessory

[`func messageReceived(TransportMessage)`](/documentation/AccessoryLiveActivities/LiveActivityForwarding/AccessoryLiveActivitiesHandler/messageReceived(_:))

Delivers a message from the paired accessory to your data provider extension.

## Relationships

### Inherits From

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`Sendable`](/documentation/Swift/Sendable)

---

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