向UINavigationBar SwiftUI添加上一步按钮

struct ContentView: View {
    var body: some View {
        NavigationView {
            VStack {
                // 添加你的视图内容
                
                NavigationLink(destination: PreviousView()) {
                    Text("上一步")
                }
            }
            .navigationBarTitle("标题")
        }
    }
}

struct PreviousView: View {
    var body: some View {
        VStack {
            // 添加上一步视图的内容
        }
        .navigationBarTitle("上一步")
    }
}