无法更改共享扩展导航栏标题颜色(Swift)

let appearance = UINavigationBarAppearance()
appearance.titleTextAttributes = [.foregroundColor: UIColor.red] // 设置标题颜色为红色
UINavigationBar.appearance().standardAppearance = appearance

import SwiftUI

struct ContentView: View {
    init() {
        UINavigationBar.appearance().standardAppearance = UINavigationBarAppearance()
    }
    
    var body: some View {
        NavigationView {
            // 托管视图的内容
        }
    }
}