Instance Method インスタンスメソッド

background(_:alignment:)

Layers the given view behind this view. 与えられたビューをこのビューの背後に層として重ねます。

Declaration 宣言 

func background<Background>(_ background: Background, alignment: Alignment = .center) -> some View where Background : View

Parameters パラメータ

background

The view to draw behind this view.

alignment

The alignment with a default value of center that you use to position the background view.

Discussion 議論

Use background(_:alignment:) when you need to place one view behind another, with the background view optionally aligned with a specified edge of the frontmost view.

The example below creates two views: the Frontmost view, and the DiamondBackground view. The Frontmost view uses the DiamondBackground view for the background of the image element inside the Frontmost view’s VStack.


struct DiamondBackground: View {
    var body: some View {
        VStack {
            Rectangle()
                .fill(.gray)
                .frame(width: 250, height: 250, alignment: .center)
                .rotationEffect(.degrees(45.0))
        }
    }
}


struct Frontmost: View {
    var body: some View {
        VStack {
            Image(systemName: "folder")
                .font(.system(size: 128, weight: .ultraLight))
                .background(DiamondBackground())
        }
    }
}

A view showing a large folder image with a gray diamond placed behind