---
title: "subscript(dynamicMember:)"
framework: corevideo
role: symbol
role_heading: Instance Subscript
path: "corevideo/cvattachmentcontainer/subscript(dynamicmember:)-8zxr1"
---

# subscript(dynamicMember:)

Get or set attachment value as a property of this object with default value.

## Declaration

```swift
subscript<ModePreference, Value>(dynamicMember keyPath: KeyPath<Keys.Type, CVAttachmentKeyDefinitionWithDefault<ModePreference, Value>>) -> Value where ModePreference : CVAttachmentModePreference, Value : CVAttachmentValueRepresentable, Value : Equatable, Value : Sendable { get set }
```