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# AVCapturePhotoOutputReadinessCoordinator

An object that monitors changes to a photo output’s capture readiness.

```
class AVCapturePhotoOutputReadinessCoordinator
```

## Overview

Use this object to coordinate user interface updates on the main queue with a [`AVCapturePhotoOutput`](/documentation/AVFoundation/AVCapturePhotoOutput) that runs on a background queue. Adopt the [`AVCapturePhotoOutputReadinessCoordinatorDelegate`](/documentation/AVFoundation/AVCapturePhotoOutputReadinessCoordinatorDelegate) protocol in your app and set its implementation as the coordinator’s delegate object to receive callbacks as the associated photo output’s [`captureReadiness`](/documentation/AVFoundation/AVCapturePhotoOutput/captureReadiness-swift.property) state changes.

You can track additional capture requests with this object by calling its [`startTrackingCaptureRequest(using:)`](/documentation/AVFoundation/AVCapturePhotoOutputReadinessCoordinator/startTrackingCaptureRequest(using:)) method. You can use it to synchronously update shutter button availability and appearance and on the main thread while calling the photo output’s [`capturePhoto(with:delegate:)`](/documentation/AVFoundation/AVCapturePhotoOutput/capturePhoto(with:delegate:)) method asynchronously on a background queue.

## Topics

### Creating a coordinator

[`init(photoOutput:)`](/documentation/AVFoundation/AVCapturePhotoOutputReadinessCoordinator/init(photoOutput:))

Creates an object that helps coordinate user interface changes with a photo output that runs on a background queue.

### Setting the delegate object

[`delegate`](/documentation/AVFoundation/AVCapturePhotoOutputReadinessCoordinator/delegate)

The coordinator’s delegate object.

### Performing tracking requests

[`startTrackingCaptureRequest(using:)`](/documentation/AVFoundation/AVCapturePhotoOutputReadinessCoordinator/startTrackingCaptureRequest(using:))

Tracks a capture request that uses the specified photo settings.

[`stopTrackingCaptureRequest(using:)`](/documentation/AVFoundation/AVCapturePhotoOutputReadinessCoordinator/stopTrackingCaptureRequest(using:))

Stop tracking the capture request represented by the specified photo setting’s unique identifier.

### Determining readiness for capture

[`captureReadiness`](/documentation/AVFoundation/AVCapturePhotoOutputReadinessCoordinator/captureReadiness)

A value that indicates whether the coordinator’s photo output is ready to respond to new capture requests in a timely manner.


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