如何在 SwiftUI 中使用本地化字符串对数组进行排序

Question

您好，我的问题是我想按 object 的标题属性对 object 的数组进行排序。当我将标题的类型从 String 更改为 LocalizedStringKey 时，出现错误。有没有办法对 localizedStringKey 后面的正确翻译字符串进行排序。

struct Item: Codable,Comparable, Hashable, Identifiable {
    static func < (lhs: Item, rhs: Item) -> Bool {
        return lhs.title < rhs.title
    }
    
    var id: Int
    
    let image: String
    let color: String
    
//    title should be LocalizedStringKey
    let title: String

    }
......

    @State private var sortedDown = false
    var filteredItems: [Item] {
        var sortedItems: [Item]
        let filteredItems = modelData.items.filter { item in
            (!showFavoritesOnly || item.isFavorite)
        }
        if sortedDown {
            sortedItems = filteredItems.sorted(by: { (item1, item2) -> Bool in
                return item1.title > item2.title
            })
        } else {
            sortedItems = filteredItems.sorted(by: { (item1, item2) -> Bool in
                return item1.title < item2.title
            })
        }
        return sortedItems
    }
    
    
    var body: some View {
        NavigationView {
            List {
                Toggle(isOn: $showFavoritesOnly, label: {
                    Text("showFavorites")
                })
                ForEach(filteredItems) { (item) in
.....

``

Answer 1

LocalizedStringKey 不符合 Comparable 协议，因此不能在其上使用 < 或 > 运算符。

您可以只使用常规 String，也可以使用自定义比较逻辑。

Answer 2

提问时不要忘记提供 minimal reproducible example。你会得到更好、更有针对性的答案。以下是您可以执行此操作的一种方法。

class LocalizeTitleViewModel: ObservableObject {
    @Published var items: [SampleItem] = [SampleItem(title: "orange", isFavorite: true), SampleItem(title: "pink", isFavorite: false), SampleItem(title: "red", isFavorite: true)]
    @Published var sortedDown = false
    @Published var showFavoritesOnly = false
    var filteredItems: [SampleItem] {
        var sortedItems: [SampleItem]
        let filteredItems = items.filter { item in
            (!showFavoritesOnly || item.isFavorite)
        }
        if sortedDown {
            sortedItems = filteredItems.sorted(by: { (item1, item2) -> Bool in
                return item1.localizedTitle > item2.localizedTitle
            })
        } else {
            sortedItems = filteredItems.sorted(by: { (item1, item2) -> Bool in
                return item1.localizedTitle < item2.localizedTitle
            })
        }
        return sortedItems
    }
}
struct LocalizeTitle: View {
    @StateObject var modelData: LocalizeTitleViewModel = LocalizeTitleViewModel()
    var body: some View {
        NavigationView {
            List {
                Toggle(isOn: $modelData.showFavoritesOnly, label: {
                    Text("showFavorites")
                })
                ForEach(modelData.filteredItems) { (item) in
                    
                    Text(item.localizedTitle)
                }
            }
        }
    }
}
struct SampleItem: Identifiable {
    
    var id: UUID = UUID()
    let title: String
    var isFavorite: Bool
    
    var localizedTitle: String{
        get{
            //You need a Localizable.strings file in your project that contains all your `title`
            return NSLocalizedString(self.title, comment: "Sample Item title")
        }
    }
}
struct LocalizeTitle_Previews: PreviewProvider {
    static var previews: some View {
        LocalizeTitle()
    }
}

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