SwiftUI 保留循环与 .searchable

Question

我想我在将可观察对象绑定到 .searchable 修饰符时发现了一个保留周期...

来验证：创建一个新的 swiftUI 应用程序；将 ContentView.swift 的内容替换为：

import SwiftUI

struct ContentView: View {
    
    var body: some View {
        NavigationView {
            List {
                NavigationLink("To Retain Cycle") {
                    RetainCycleView()
                }
            }
            .navigationTitle("Retain Cycle Demo")
        }
        .navigationViewStyle(.stack)
    }
}
    
struct RetainCycleView: View {
    
    @StateObject var model = Retainer()
//    @State var enteredText: String = ""
    
    var body: some View {
        VStack(alignment: .leading, spacing: 4) {
            Text("Navigate back to the previous view.")
            Text("You will see that 'Retainer' was NOT deallocated.")
            Text("(it's deinit function prints deallocing Retainer)")
                .font(.callout)
        }
        .padding()
        .searchable(text: $model.enteredText)
//       ^---- retain cycle
//        .searchable(text: $enteredText)
//       ^---- no retain cycle when using the @State var
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

class Retainer: ObservableObject {
    
    @Published var enteredText: String = ""
    
    init() { print("instantiated Retainer") }
    deinit { print("deallocing Retainer") }
}

当我从堆栈中弹出视图时，不会为 Retainer 调用 deinit。如果我删除 .searchable 修饰符，它的行为确实符合预期。