1.創建ViewModifier

//修改導航欄的顏色
struct StatusBarColorModifier: ViewModifier {
    var color: UIColor
    init(color: UIColor) {
        self.color = color
        let navibarAppearance = UINavigationBarAppearance()
        navibarAppearance.configureWithTransparentBackground()
        //修改背景的顏色
        navibarAppearance.backgroundColor = color
        //設置字體的顏色和大小
        navibarAppearance.titleTextAttributes = [
            .foregroundColor:UIColor.white,
            .font:UIFont.monospacedSystemFont(ofSize: 17, weight: .black)
        ]
        
        UINavigationBar.appearance().standardAppearance = navibarAppearance
        UINavigationBar.appearance().compactAppearance = navibarAppearance
        UINavigationBar.appearance().scrollEdgeAppearance = navibarAppearance
    }
    
    func body(content: Content) -> some View {
        ZStack{
            content
            VStack {
                GeometryReader { geometry in
                    Color(self.color)
                        .frame(height: geometry.safeAreaInsets.top)
                        .edgesIgnoringSafeArea(.top)
                    Spacer()
                }
            }
        }
    }
}

2.創建一個View的擴展方便調用

extension View {
    func statusBarColor(_ color: Color) -> some View {
        self.modifier(StatusBarColorModifier(color: UIColor(color)))
    }
}

3.調用

NavigationView {
            .navigationBarHidden(false)
            .navigationBarTitle(Text("導航欄"), displayMode: .inline)
        }
        .statusBarColor(.red)