Question

在这里，我创建了一个可观察对象，并将其添加到环境对象中。在列表行上，单击“我需要更新我的环境对象的某些值”，然后再导航到DetailView。我只是想根据行选择显示对象的详细信息。

这是我尝试的代码：

class MyModel:ObservableObject 
{
    var selectDate: String
    var duration: String
    var selectProject: String

    init(dateStr: String, durationStr: String, projectName: String) {
        self.selectDate = dateStr
        self.duration = durationStr
        self.selectProject = projectName
    }

}

struct ContentView: View {
    @EnvironmentObject var model: MyModel
    @Environment (\.colorScheme) var colorScheme:ColorScheme
    @Environment(\.presentationMode) var presentationMode: Binding<PresentationMode>
    @ObservedObject var viewModel = TimesheetViewModel()
    var body: some View {
      List {                                      
          ForEach(self.viewModel.tasksArr, id:\.id) { taskObj in
               NavigationLink(destination: DetailView()) { >need to update **model** before navigating Detail View
                 TimeSheetRowView(taskObj:rowElement)
           }
   }
}

还有其他方法可以执行相同的任务吗？帮帮我

Answer 1

您可以使用Button和空的NavigationLink。点击按钮后，您可以通过编程方式选择一个NavigationLink，但必须先执行以下操作：

@State private var selectedItem: String?

var body: some View {
    NavigationView {
        List {
            ForEach(self.viewModel.tasksArr, id:\.id) { taskObj in
                HStack {
                    Button(action: {
                        // here you can update your model etc.
                        self.selectedItem = item
                    }, label: {
                        TimeSheetRowView(taskObj:rowElement)
                    })
                    NavigationLink(destination: DetailView(), tag: item, selection: self.$selectedItem) {
                        EmptyView()
                    }
                }
            }
        }
    }
}

更新listRow上的环境对象导航前单击

1 个答案: