---
title: defaultValue
framework: swiftui
role: symbol
role_heading: Type Property
path: swiftui/layoutvaluekey/defaultvalue
---

# defaultValue

The default value of the key.

## Declaration

```swift
static var defaultValue: Self.Value { get }
```

## Discussion

Discussion Implement the defaultValue property for a type that conforms to the LayoutValueKey protocol. For example, you can create a Flexibility layout value that defaults to nil: private struct Flexibility: LayoutValueKey {     static let defaultValue: CGFloat? = nil } The type that you declare for the defaultValue sets the layout key’s Value associated type. The Swift compiler infers the key’s associated type in the above example as an optional CGFloat. Any view that you don’t explicitly set a value for uses the default value. Override the default value for a view using the layoutValue(key:value:) modifier.

## See Also

### Providing a default value

- [Value](swiftui/layoutvaluekey/value.md)