NavigationView例子:

var body: some View {
    var body: some View {
        NavigationView {
            ZStack {
                // Background
                Color.blue.edgesIgnoringSafeArea(.all)

                content
            }
            //.navigationTitle(Constants.navigationTitle)
            //.navigationBarItems(leading: cancelButton, trailing: doneButton)
            //.navigationViewStyle(StackNavigationViewStyle())
        }
    }
}

var content: some View {
    // your content here; List, VStack etc - whatever you want
    VStack {
       Text("Hello World")
    }
}

这个解决方案有效吗?:

添加以下行到SceneDelegate: window.rootViewController?backgroundColor = .black

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        if let windowScene = scene as? UIWindowScene {

                window.rootViewController?.view.backgroundColor = .black
}

(SwiftUI / Xcode 11)

1 .background(Color.black) //系统颜色

2 .background(Color("green")) //用于您在Assets.xcassets中创建的颜色

或者你可以用Command+Click在元素上改变它。

希望能有所帮助:)

struct Soview: View {
    var body: some View {
        VStack{
            Text(/*@START_MENU_TOKEN@*/"Hello, World!"/*@END_MENU_TOKEN@*/)
                .frame(maxWidth:.infinity,maxHeight: .infinity)
        }.background(Color.yellow).ignoresSafeArea(.all)
    }
}

Xcode 11.5

简单地使用ZStack添加背景颜色或图像到你的SwiftUI的主视图

struct ContentView: View {
    var body: some View {
        ZStack {
            Color.black
        }
        .edgesIgnoringSafeArea(.vertical)
    }
}

Swift UI中场景委托上的代码

内容查看background-color

window.rootViewController ? .view。backgroundColor = .lightGray