你可以简单地改变一个视图的背景颜色:

var body : some View{


    VStack{

        Color.blue.edgesIgnoringSafeArea(.all)

    }


}

你也可以使用ZStack:

var body : some View{


    ZStack{

        Color.blue.edgesIgnoringSafeArea(.all)

    }


}

(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:)

要制作一个中央/可重用的后台小部件，您可以这样做-

import SwiftUI
struct BgView<Content>: View where Content: View {
        private let content: Content
    
        public init(@ViewBuilder content: () -> Content) {
            self.content = content()
        }
    
        var body : some View {
            ZStack {
              Color.black.ignoresSafeArea()
                content
            }
          } 
    }

并且可以像下面这样轻松地在所有视图中使用-

import SwiftUI

struct TestView: View {
    var body: some View {
      BgView{
        Text("Hello, World!")
      }.foregroundColor(.white)
    }
}

struct TestView_Previews: PreviewProvider {
    static var previews: some View {
        TestView()
    }
}

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
}

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")
    }
}

Swift UI中场景委托上的代码

内容查看background-color

window.rootViewController ? .view。backgroundColor = .lightGray