SwiftUI：调用以编程方式创建的视图的函数

使用@Asperi和@jnpdx的 comments ，我能够想出一个比我需要的更强大的解决方案:

class ScrollToModel: ObservableObject {
    enum Action {
        case end
        case top
    }
    @Published var direction: Action? = nil
}

struct HigherView: View {
    @StateObject var vm = ScrollToModel()
    var numAbstractedViewsToMake: Int

    var body: some View {
        VStack {
            HStack {
                Button(action: { vm.direction = .top }) { // < here
                    Image(systemName: "arrow.up.to.line")
                      .padding(.horizontal)
                }
                Button(action: { vm.direction = .end }) { // << here
                    Image(systemName: "arrow.down.to.line")
                      .padding(.horizontal)
                }
            }
            Divider()
            HStack {
                ForEach(0..<numAbstractedViewsToMake, id: \.self) { _ in
                    ScrollToModelView(vm: vm)
                }
            }
        }
    }
}

struct AbstractedView: View {
    @ObservedObject var vm: ScrollToModel

    let items = (0..<200).map { $0 } // this is his demo
    var body: some View {
        VStack {
            
            ScrollViewReader { sp in
                ScrollView {
               
                    LazyVStack { // this bit can be changed accordingly
                        ForEach(items, id: \.self) { item in
                            VStack(alignment: .leading) {
                                Text("Item \(item)").id(item)
                                Divider()
                            }.frame(maxWidth: .infinity).padding(.horizontal)
                        }
                    }.onReceive(vm.$direction) { action in
                        guard !items.isEmpty else { return }
                        withAnimation {
                            switch action {
                                case .top:
                                    sp.scrollTo(items.first!, anchor: .top)
                                case .end:
                                    sp.scrollTo(items.last!, anchor: .bottom)
                                default:
                                    return
                            }
                        }
                    }
                }
            }
        }
    }
}

谢谢你们！