Swift 为什么 Apple Scrumdinger Sample App 使用两个事实来源

我想弄明白为什么苹果用@State在两个不同的视图中实例化了DailyScrum.Data.我以为你应该只有一个真相来源.我猜一个是用于创建新的Scrum数据，另一个是提供更新或编辑Scrum数据.但我不确定.

import SwiftUI

struct DetailView: View {
    @Binding var scrum: DailyScrum
    
    @State private var data = DailyScrum.Data()
    @State private var isPresentingEditView = false
    
    var body: some View {
        List {
            Section(header: Text("Meeting Info")) {
                NavigationLink(destination: MeetingView(scrum: $scrum)) {
                    Label("Start Meeting", systemImage: "timer")
                        .font(.headline)
                        .foregroundColor(.accentColor)
                }
               
            }
           
        }
    }
}

import SwiftUI

struct ScrumsView: View {
    @Binding var scrums: [DailyScrum]
    @Environment(\.scenePhase) private var scenePhase
    @State private var isPresentingNewScrumView = false
    @State private var newScrumData = DailyScrum.Data()
    let saveAction: ()->Void
    
   var body: some View {
        List {
            ForEach($scrums) { $scrum in
                NavigationLink(destination: DetailView(scrum: $scrum)) {
                    CardView(scrum: scrum)
                }
                .listRowBackground(scrum.theme.mainColor)
            }
        }
        .navigationTitle("Daily Scrums")
    }
}