---
title: DDDiscoverySession
framework: DeviceDiscoveryExtension
role: symbol
role_heading: Class
path: devicediscoveryextension/dddiscoverysession
---

# DDDiscoverySession

An object that relays device discovery events from the extension to the system.

## Declaration

```swift
class DDDiscoverySession
```

## Overview

Overview The system passes the extension an instance of this class when it attempts to discover a device. Device discovery starts when an app displays AVRoutePickerView and the system calls the extension’s startDiscovery(session:) implementation.

## Topics

### Providing an event to the system

- [report(_:)](devicediscoveryextension/dddiscoverysession/report(_:).md)

## Relationships

### Inherits From

- [NSObject](objectivec/nsobject-swift.class.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)

## See Also

### Extension

- [DDDiscoveryExtension](devicediscoveryextension/dddiscoveryextension.md)
- [DDDiscoveryExtensionConfigurationProtocol](devicediscoveryextension/dddiscoveryextensionconfigurationprotocol.md)