# callAsFunction(_:) Combines the specified views into a single composite view using the layout algorithms of the custom layout container. ``` @export(implementation) func callAsFunction(@ContentBuilder _ content: () -> V) -> some View where V : View ``` ## Parameters `content` A [`ContentBuilder`](/documentation/SwiftUI/ContentBuilder) that contains the views to lay out. ## Return Value A composite view that combines all the input views. ## Discussion Don’t call this method directly. SwiftUI calls it when you instantiate a custom layout that conforms to the [`Layout`](/documentation/SwiftUI/Layout) protocol: ``` BasicVStack { // Implicitly calls callAsFunction. Text("A View") Text("Another View") } ``` For information about how Swift uses the `callAsFunction()` method to simplify call site syntax, see [Methods with Special Names](https://docs.swift.org/swift-book/ReferenceManual/Declarations.html#ID622) in *The Swift Programming Language*. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)