Question

我是SWIFT的初学者，现在我面临UI的问题。让我尝试解释我的问题。

我的主视图屏幕数据来自使用Observable对象的Web服务，并且第一次加载了该数据。但是，当我尝试打开左侧幻灯片菜单时，打开左侧幻灯片菜单视图时，homeView webservice / observable对象数据只是被清除。为什么我的可观察对象数据为空。让我分享我的代码：

1 .------这是我的main / parentView

Expected spy executeRules to have been called.

2 .-----这是我的RouteChanger视图，用于导航到视图的不同页面。

struct ContentView: View {

    @EnvironmentObject var viewRouter: ViewRouter

    var body: some View {

        let drag = DragGesture()
            .onEnded {
                if $0.translation.width < -100 {
                    withAnimation {
                        self.viewRouter.showSlideOutMenu = false
                        self.viewRouter.showDepartmentsMenu = false
                        self.viewRouter.showAccountMenu = false
                    }
                }
        }

        return GeometryReader { g in
            ZStack(alignment: .leading) {
                RouteChanger(viewRouter: self._viewRouter)
                if self.viewRouter.showSlideOutMenu {
                    MainMenuView(viewRouter: self._viewRouter)
                        .frame(width: g.size.width/2)
                        .transition(.move(edge: .leading))
                }
            }
            .gesture(drag)
        }
    }
}

3 ....这是我正在使用Observable Object的homeView

struct RouteChanger: View {

    @EnvironmentObject var viewRouter: ViewRouter

    var body: some View {
        GeometryReader { g in
            VStack {

                if self.viewRouter.currentPage == "Home" {

                    HomeView()

                    //.modifier(PageSwitchModifier())
                }

            }
        }
    }
}

Answer 1

EnvironmentObject会自动为所有子视图注入，因此ContentView的相关部分应如下所示

 ZStack(alignment: .leading) {
    RouteChanger()                               // << here
    if self.viewRouter.showSlideOutMenu {
        MainMenuView()                           // << here
             .frame(width: g.size.width/2)
             .transition(.move(edge: .leading))
     }

Swift UI和ObservableObject对象数据已清除

1 个答案: