---
title: buttonSizing
framework: swiftui
role: symbol
role_heading: Instance Property
path: swiftui/environmentvalues/buttonsizing
---

# buttonSizing

The preferred sizing behavior of buttons in the view hierarchy.

## Declaration

```swift
var buttonSizing: ButtonSizing { get set }
```

## Discussion

Discussion Views may use the specified button sizing when determining the size they choose to be in their primary axis within their parent view’s proposed size. Use buttonSizing(_:) to set the preferred sizing behavior in the environment. Many built-in controls that display as a button adapt to this environment value. You can read the environment value in your own views and styles as well to adapt to the preferred sizing. struct CustomButtonStyle: ButtonStyle {     @Environment(\.buttonSizing) private var buttonSizing

private var maxWidth: CGFloat {         switch buttonSizing {         case .flexible: .infinity         case .fitted, _: nil         }     }

func makeBody(configuration: Configuration) -> some View {         configuration.content             .frame(maxWidth: maxWidth)             .background(.tint, in: Capsule())     } }