SwiftUI：关闭第一个工作表时如何显示第二个工作表

Posted 2023-03-10

【中文标题】SwiftUI：关闭第一个工作表时如何显示第二个工作表

【英文标题】：SwiftUI: How to display the second Sheet when first sheet is closed

【发布时间】：2021-04-20 06:48:08

【问题描述】：

当用户登录并按下 MyGarage 按钮时，我想使用 .fullScreenCover 创建一个侧边菜单。 .fullScreenCover 将关闭，主视图将导航到 MyGarage 视图。但如果用户未登录，.fullScreenCover 将关闭，并出现带有.fullScreenCover 的 loginView。我的问题是，如果我在主视图中放置 2 个相同的 .fullScreenCover，.fullScreenCover 将不起作用。有没有办法解决这个问题？抱歉，我有点难以解释。

这是代码

侧边菜单视图

struct SideMenuView: View 
    @Environment(\.presentationMode) var presentationMode
    @Binding var showMyGarage: Bool
    @Binding var showSignIn: Bool
    var user = 0 //If user is 1, it is logged in
    var body: some View 
        NavigationView
            VStack
                Button(action: 
                    presentationMode.wrappedValue.dismiss()
                    if user == 1 
                        self.showMyGarage = true
                    else
                        self.showSignIn = true
                    
                , label: 
                    Text("My Garage")
                )
            
            .navigationBarTitleDisplayMode(.inline)
            .navigationBarItems(leading:
                                    HStack(spacing: 20)
                                        Button(action: 
                                            presentationMode.wrappedValue.dismiss()
                                        , label: 
                                            Text("X")
                                        )
                                        Text("Main Menu")
                                    
                )
        .navigationViewStyle(StackNavigationViewStyle())
    

主视图

struct HomeView: View 
    @State var showSideMenu = false
    @State private var showMyGarage = false
    @State var showSignIn = false

    var body: some View 
        VStack

            Text("Home")
            
            NavigationLink(destination: MyGarageView(showMyGarage: $showMyGarage), isActive: $showMyGarage)
                EmptyView()
            
            
        
        .navigationBarItems(leading:
                                Button(action: 
                                    self.showSideMenu.toggle()
                                , label: 
                                    Text("Menu")
                                )
            )
        .fullScreenCover(isPresented: $showSideMenu, content: 
            SideMenuView(showMyGarage: $showMyGarage, showSignIn: $showSignIn)
        )
        .fullScreenCover(isPresented: $showSignIn, content: 
            SignInView()
        )

    


struct MyGarageView: View 
    @Binding var showMyGarage: Bool
    var body: some View 
        Text("MyGarage")
    


struct SignInView: View 
    var body: some View 
        Text("Sign In")
    

【参考方案1】：

尝试将它们附加到不同的视图，例如

var body: some View 
    VStack

        Text("Home")
          .fullScreenCover(isPresented: $showSideMenu, content: 
             SideMenuView(showMyGarage: $showMyGarage, showSignIn: $showSignIn)
          )
        
        NavigationLink(destination: MyGarageView(showMyGarage: $showMyGarage), isActive: $showMyGarage)
            EmptyView()
        
        .fullScreenCover(isPresented: $showSignIn, content: 
           SignInView()
        )
    
    .navigationBarItems(leading:
                            Button(action: 
                                self.showSideMenu.toggle()
                            , label: 
                                Text("Menu")
                            )
        )