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# isContinuousAutoFocusTrackingSubjectAcquired

Indicates whether the device is actively tracking a subject in the scene to maintain focus.

```
var isContinuousAutoFocusTrackingSubjectAcquired: Bool { get }
```

## Discussion

Returns `true` when the capture device is actively tracking a subject in the scene, and `false` otherwise. The subject is initially identified by [`focusPointOfInterest`](/documentation/AVFoundation/AVCaptureDevice/focusPointOfInterest) when focus mode is set to `AVCaptureFocusModeContinuousAutoFocus` with [`isContinuousAutoFocusTrackingEnabled`](/documentation/AVFoundation/AVCaptureDevice/isContinuousAutoFocusTrackingEnabled) set to `true`. This property is key-value observable and reflects only whether a subject is actively tracked, not which one. To identify the tracked subject, include [`focusTrackedObject`](/documentation/AVFoundation/AVMetadataObject/ObjectType/focusTrackedObject) in the `metadataObjectTypes` of [`AVCaptureMetadataOutput`](/documentation/AVFoundation/AVCaptureMetadataOutput). The [`AVMetadataFocusTrackedObject`](/documentation/AVFoundation/AVMetadataFocusTrackedObject) delivered by the metadata output represents the subject currently tracked for continuous autofocus.

---

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