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# ARKitSession

The main entry point for receiving data from ARKit.

```
final class ARKitSession
```

## Overview

Sessions in ARKit require either implicit or explicit authorization. To explicitly ask for permission for a particular kind of data and choose when a person is prompted for that permission, call [`requestAuthorization(for:)`](/documentation/ARKit/ARKitSession/requestAuthorization(for:)) before [`run(_:)`](/documentation/ARKit/ARKitSession/run(_:)).

The following shows a session that starts by requesting implicit authorization to use world sensing:

```swift
let planeData = PlaneDetectionProvider(alignments: [.horizontal, .vertical])

Task {
    do {
        try await self.session.run([planeData])
        // Update app based on the planeData.anchorUpdates async sequence.
    } catch {
        print("ARKitSession error:", error)
    }
}
```

Because a [`PlaneDetectionProvider`](/documentation/ARKit/PlaneDetectionProvider) instance’s required authorizations include [`ARKitSession.AuthorizationType.worldSensing`](/documentation/ARKit/ARKitSession/AuthorizationType/worldSensing), the system asks someone using your app to permit world sensing before ARKit supplies any of that kind of data.

> Note:
> ARKit stops sessions when they’re deinitialized; keep a reference to a session instance for as long as the session needs to run.

## Topics

### Starting and stopping a session

[`init()`](/documentation/ARKit/ARKitSession/init())

Creates a new session.

[`run(_:)`](/documentation/ARKit/ARKitSession/run(_:))

Runs a session with the data providers you supply.

[`stop()`](/documentation/ARKit/ARKitSession/stop())

Stops all data providers running in this session.

[`ARKitSession.Error`](/documentation/ARKit/ARKitSession/Error)

An error that might occur when running data providers on an ARKit session.

### Getting authorization

[`requestAuthorization(for:)`](/documentation/ARKit/ARKitSession/requestAuthorization(for:))

Requests authorization from the user to use the specified kinds of ARKit data.

[`ARKitSession.AuthorizationType`](/documentation/ARKit/ARKitSession/AuthorizationType)

The authorization types you can request from ARKit.

[`queryAuthorization(for:)`](/documentation/ARKit/ARKitSession/queryAuthorization(for:))

Checks whether the current session is authorized for particular authorization types without requesting authorization.

[`ARKitSession.AuthorizationStatus`](/documentation/ARKit/ARKitSession/AuthorizationStatus)

The authorization states for a type of ARKit data.

### Observing a session

[`events`](/documentation/ARKit/ARKitSession/events-swift.property)

An asynchronous sequence of events that provide updates to the current authorization status of the session.

[`ARKitSession.Events`](/documentation/ARKit/ARKitSession/Events-swift.struct)

A sequence of events.

[`ARKitSession.Event`](/documentation/ARKit/ARKitSession/Event)

Enumeration of possible session events.

[`description`](/documentation/ARKit/ARKitSession/description)

A textual representation of this session.


---

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