---
title: NSLayoutConstraint.Attribute.width
framework: appkit
role: symbol
role_heading: Case
path: appkit/nslayoutconstraint/attribute/width
---

# NSLayoutConstraint.Attribute.width

The width of the object’s alignment rectangle.

## Declaration

```swift
case width
```

## See Also

### Constants

- [NSLayoutConstraint.Attribute.left](appkit/nslayoutconstraint/attribute/left.md)
- [NSLayoutConstraint.Attribute.right](appkit/nslayoutconstraint/attribute/right.md)
- [NSLayoutConstraint.Attribute.top](appkit/nslayoutconstraint/attribute/top.md)
- [NSLayoutConstraint.Attribute.bottom](appkit/nslayoutconstraint/attribute/bottom.md)
- [NSLayoutConstraint.Attribute.leading](appkit/nslayoutconstraint/attribute/leading.md)
- [NSLayoutConstraint.Attribute.trailing](appkit/nslayoutconstraint/attribute/trailing.md)
- [NSLayoutConstraint.Attribute.height](appkit/nslayoutconstraint/attribute/height.md)
- [NSLayoutConstraint.Attribute.centerX](appkit/nslayoutconstraint/attribute/centerx.md)
- [NSLayoutConstraint.Attribute.centerY](appkit/nslayoutconstraint/attribute/centery.md)
- [NSLayoutConstraint.Attribute.lastBaseline](appkit/nslayoutconstraint/attribute/lastbaseline.md)
- [NSLayoutConstraint.Attribute.firstBaseline](appkit/nslayoutconstraint/attribute/firstbaseline.md)
- [NSLayoutConstraint.Attribute.notAnAttribute](appkit/nslayoutconstraint/attribute/notanattribute.md)