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# readinessCoordinator(_:captureReadinessDidChange:)

Tells the delegate that the capture readiness state of a photo output changed.

```
optional func readinessCoordinator(_ coordinator: AVCapturePhotoOutputReadinessCoordinator, captureReadinessDidChange captureReadiness: AVCapturePhotoOutput.CaptureReadiness)
```

## Parameters

`coordinator`

The delegate’s coordinator object.

`captureReadiness`

An updated capture readiness value.

## Discussion

The system always performs this call on the main queue, so you can use it to update your user interface’s shutter button availability and appearance.

---

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