【Swift UI】フィルター機能の実装方法！リストに検索ボックスを作成

struct ContentView: View {
    struct Lang:Identifiable{
        var id = UUID()
        var name:String
        var version:Double
    }
    let langArray = [Lang(name: "HTML", version: 5.0),Lang(name: "CSS", version: 3.0),Lang(name: "PHP", version: 8.1),Lang(name: "Swift", version: 5.4)]

    var body: some View {
        List(langArray) { item in
            HStack{
                Text(item.name)
                Spacer()
                Text("Version:\(String(format: "%.1f", item.version))")
            }
        }
    }
}

var all = [
    Lang(name : "HTML", version : 5.0),
    Lang(name : "CSS", version : 3.0),
    Lang(name : "Swift", version : 5.4)
]
var searchLanguage = all.filter({ $0.version > 4 })
print(searchLanguage)
[__lldb_expr_37.Lang(id: 919B3A58-6E7A-485B-A442-99BA617D88FE, name: "HTML", version: 5.0), __lldb_expr_37.Lang(id: 497D31D0-A53E-4CF7-A1D1-62722269DA3D, name: "Swift", version: 5.4)]

 List(langArray.filter({$0.version > 4})) { item in
    HStack{
        Text(item.name)
        Spacer()
        Text("Version:\(String(format: "%.1f", item.version))")
    }
}

@State  var isFilter:Bool = false // フィルターON/OFF真偽値
var body: some View {
    VStack {
        Button(action: {
            isFilter.toggle()
        }, label: {
            Text(isFilter ? "OFF" : "ON")
        })

        List(langArray.filter(isFilter ? {$0.version > 4} : {$0.version != 0})) { item in
            HStack{
                Text(item.name)
                Spacer()
                Text("Version:\(String(format: "%.1f", item.version))")
            }
        }
    }
}

langArray.filter(isFilter ? {$0.version > 4} : {$0.version != 0})

@State  var text:String = ""
    
var body: some View {
    NavigationView{
            List(langArray.filter(text.isEmpty ? { $0.name != ""  } : { $0.name.contains(text)})) { item in
                HStack{
                    Text(item.name)
                    Spacer()
                    Text("Version:\(String(format: "%.1f", item.version))")
                }
            }.navigationTitle("言語")
    }.searchable(text: $text,prompt: "検索値")
}

langArray.filter(text.isEmpty ? { $0.name != ""  } : { $0.name.contains(text)})