---
title: "subscript(_:)"
framework: uikit
role: symbol
role_heading: Instance Subscript
path: "uikit/uimutabletraits-13ja5/subscript(_:)-2tbov"
---

# subscript(_:)

## Declaration

```swift
subscript<T>(trait: T.Type) -> T.Value where T : UITraitDefinition, T.Value == CGFloat? { get set }
```