---
title: body
framework: swiftui
role: symbol
role_heading: Instance Property
path: swiftui/attributedtextformattingdefinition/body-1b01t
---

# body

The constraints of the formatting definition.

## Declaration

```swift
@AttributedTextFormatting.DefinitionBuilder<Self.Scope> var body: Self.Body { get }
```

## Discussion

Discussion When you implement a custom definition, you must implement a computed body property to provide the constraints of your definition. Return a definition that’s composed of built-in definitions that SwiftUI provides, such as AttributedTextFormattingDefinition.ValueConstraint and AttributedTextValueConstraints, plus other composite AttributedTextFormattingDefinitions that you’ve already defined: struct MyTextFormattingDefinition: AttributedTextFormattingDefinition {     var body: some AttributedTextFormattingDefinition<         AttributeScopes.SwiftUIAttributes     > {         ValueConstraint(             for: \.underlineStyle,             values: [nil, .single],             default: .single)         MyAttributedTextValueConstraint()     } } Note that the order of the constraints in the result builder matters as constraints are applied in order. For details, see AttributedTextValueConstraint/constrain(_:)-(Attributes).