---
title: "mask(alignment:_:)"
framework: swiftui
role: symbol
role_heading: Instance Method
path: "swiftui/view/mask(alignment:_:)"
---

# mask(alignment:_:)

Masks this view using the alpha channel of the given view.

## Declaration

```swift
nonisolated func mask<Mask>(alignment: Alignment = .center, @ContentBuilder _ mask: () -> Mask) -> some View where Mask : View

```

## Parameters

- `alignment`: The alignment for mask in relation to this view.
- `mask`: The view whose alpha the rendering system applies to the specified view.

## Discussion

Discussion Use mask(_:) when you want to apply the alpha (opacity) value of another view to the current view. This example shows an image masked by rectangle with a 10% opacity: Image(systemName: "envelope.badge.fill")     .foregroundColor(Color.blue)     .font(.system(size: 128, weight: .regular))     .mask {         Rectangle().opacity(0.1)     }

## See Also

### Masking and clipping

- [clipped(antialiased:)](swiftui/view/clipped(antialiased:).md)
- [clipShape(_:style:)](swiftui/view/clipshape(_:style:).md)