<!--
{
  "availability" : [
    "macOS: 14.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "VisionKit",
  "identifier" : "/documentation/VisionKit/ImageAnalysisOverlayView/SubjectUnavailable",
  "metadataVersion" : "0.1.0",
  "role" : "Enumeration",
  "symbol" : {
    "kind" : "Enumeration",
    "modules" : [
      "VisionKit"
    ],
    "preciseIdentifier" : "s:9VisionKit24ImageAnalysisOverlayViewC18SubjectUnavailableO"
  },
  "title" : "ImageAnalysisOverlayView.SubjectUnavailable"
}
-->

# ImageAnalysisOverlayView.SubjectUnavailable

Error conditions that can occur during subject analysis.

```
enum SubjectUnavailable
```

## Overview

This enumeration contains a failure [`ImageAnalysisOverlayView.SubjectUnavailable.imageUnavailable`](/documentation/VisionKit/ImageAnalysisOverlayView/SubjectUnavailable/imageUnavailable) that can occur when the [`ImageAnalysisOverlayView.Subject`](/documentation/VisionKit/ImageAnalysisOverlayView/Subject) property [`image`](/documentation/VisionKit/ImageAnalysisOverlayView/Subject/image) fails to produce a result.

## Topics

### Enumeration Cases

[`case imageUnavailable`](/documentation/VisionKit/ImageAnalysisOverlayView/SubjectUnavailable/imageUnavailable)

An error that indicates the subject fails to produce an image.

## Relationships

### Conforms To

[`Error`](/documentation/Swift/Error)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`Hashable`](/documentation/Swift/Hashable)

[`Sendable`](/documentation/Swift/Sendable)

[`Equatable`](/documentation/Swift/Equatable)

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)