# callAsFunction(value:) Pushes a window defined by a window group that presents the type of the specified value. ``` @MainActor func callAsFunction(value: D) where D : Decodable, D : Encodable, D : Hashable ``` ## Parameters `value` The value to present. ## Discussion Don’t call this method directly. SwiftUI calls it when you call the [`pushWindow`](/documentation/SwiftUI/EnvironmentValues/pushWindow) action with a value: ``` pushWindow(value: video.id) ``` 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)