.identified(by:) 已弃用？

Question

此代码之前在 Xcode11 Beta 4 中运行。在最新的 Beta 5 中，我在“.identified(by:)”代码块中遇到错误。

我查看了 XCode11 Beta 5 的发行说明，但没有看到任何对 .identified(by:) 被弃用的引用。

import SwiftUI
import Combine

struct Popups: Decodable {
    let name, truckRating, upcomingLocation, cuisine, truckImage, region, 
city, state, currentLocation, numberOfRatings, truckExpense : String
}

class NetworkManager: ObservableObject {
    var objectWillChange = PassthroughSubject<NetworkManager, Never>()

    var popups = [Popups]() {
        didSet {
            objectWillChange.send(self)
        }
    }

    init() {
        guard let url = URL(string:
            "https://www.example.com/db.json") else { return }
        URLSession.shared.dataTask(with: url) { (data, _, _) in

            guard let data = data else { return }

            let popups = try! JSONDecoder().decode([Popups].self, from: data)
            DispatchQueue.main.async {
               self.popups = popups
            }


            print("Completed fetching JSON")
        }.resume()
    }
}        

struct ItemsView: View {

        @State var networkManager = NetworkManager()

        var body: some View {
            NavigationView {
                List (
                    networkManager.popups.identified(by: \.name)
                ) { popup in
                    ItemsRowView(popup: popup)
                }.navigationBarTitle(Text("Pop Ups"))
            }
        }
    }

错误消息指出 "Value of type '[Popups]' has no member 'identified'"

Answer 1

.identified(by:) 已弃用。正如您正确指出的那样，Xcode beta 的发行说明中没有注明这一点，但在 iOS beta 的发行说明中没有注明，这就是您找不到它的原因。这有点令人困惑，因为与 SwiftUI 相关的更改分散在 iOS 13 beta、Xcode 11 beta 和 macOS Catalina beta 的发行说明中。

https://developer.apple.com/documentation/ios_ipados_release_notes/ios_ipados_13_beta_5_release_notes

The identified(by:) method on the Collection protocol is deprecated in favor of dedicated init(:id:selection:rowContent:) and init(:id:content:) initializers. (52976883, 52029393)

但是 identified(by:) 弃用发生在 beta 4 中，因此以下内容也适用：

SwiftUI APIs deprecated in previous betas are now removed. (52587863)

这个问题在某种程度上与重复，但发行说明中提到弃用的地方令人困惑，值得将其作为一个单独的问题。

.identified(by:) 已弃用？

.identified(by:) Deprecated?

swiftui

xcode11