---
title: MLBoundingBoxAnchor
framework: createml
role: symbol
role_heading: Enumeration
path: createml/mlboundingboxanchor
---

# MLBoundingBoxAnchor

A location within a bounding box that an annotation’s coordinates use as their reference point.

## Declaration

```swift
enum MLBoundingBoxAnchor
```

## Topics

### Designating anchors

- [MLBoundingBoxAnchor.center](createml/mlboundingboxanchor/center.md)
- [MLBoundingBoxAnchor.topLeft](createml/mlboundingboxanchor/topleft.md)
- [MLBoundingBoxAnchor.bottomLeft](createml/mlboundingboxanchor/bottomleft.md)

## Relationships

### Conforms To

- [Equatable](swift/equatable.md)
- [Escapable](swift/escapable.md)
- [Hashable](swift/hashable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Bounding box annotations

- [MLObjectDetector.AnnotationType.boundingBox(units:origin:anchor:)](createml/mlobjectdetector/annotationtype/boundingbox(units:origin:anchor:).md)
- [MLBoundingBoxUnits](createml/mlboundingboxunits.md)
- [MLBoundingBoxCoordinatesOrigin](createml/mlboundingboxcoordinatesorigin.md)