---
title: firstAttribute
framework: uikit
role: symbol
role_heading: Instance Property
path: uikit/nslayoutconstraint/firstattribute
---

# firstAttribute

The attribute of the first object participating in the constraint.

## Declaration

```swift
var firstAttribute: NSLayoutConstraint.Attribute { get }
```

## See Also

### Accessing constraint data

- [firstItem](uikit/nslayoutconstraint/firstitem.md)
- [relation](uikit/nslayoutconstraint/relation-swift.property.md)
- [secondItem](uikit/nslayoutconstraint/seconditem.md)
- [secondAttribute](uikit/nslayoutconstraint/secondattribute.md)
- [multiplier](uikit/nslayoutconstraint/multiplier.md)
- [constant](uikit/nslayoutconstraint/constant.md)
- [firstAnchor](uikit/nslayoutconstraint/firstanchor.md)
- [secondAnchor](uikit/nslayoutconstraint/secondanchor.md)