我可以将 AnyPublisher 转换为 Published.Publisher 吗？

Question

所以我有一个 AnyPublisher<Foo, Error> 类型的值，我需要将其转换为 Published<Foo>.Publisher 以便我可以将其用作 @Published

所以我的想法是我有一个 MVVM 架构

struct SwiftUIView: View {
  @ObservedObject var viewModel: MyViewModel
  var body: some View {
    Text(/*Foo has a title, how do I access it? */)
  }
  
}
class MyViewModel: ObservableObject {
  var cellModels: AnyPublisher<Foo, Error>
  // so the idea is to have and then access it in swiftUI view via viewModel.cellModels2.title
  @Published cellModels2 = convert_somehow_to_publisher(cellModels)
}

显然我不能使用 viewModel.cellModels

这可能吗？

Answer 1

看起来您需要的是在您的视图模型上有一个 Foo 属性，并使用您拥有的 AnyPublisher<Foo, Error> 发布者更新它。

class MyViewModel: ObservableObject {

  var cellModels: AnyPublisher<Foo, Error> = ...
  private var cancellable: AnyCancellable?

  @Published var foo: Foo?

  init() {
    cancellable = cellModels.assign(to: \.foo, on: self)
  }
}

然后就可以在视图中正常访问.foo了：

struct SwiftUIView: View {
  @ObservedObject var viewModel: MyViewModel
  var body: some View {
    Text(viewModel.foo?.title ?? "")
  }
}

我可以将 AnyPublisher 转换为 Published.Publisher 吗？

Can I transform AnyPublisher to Published.Publisher?

combine