了解 SwiftData 和绑定/更新，一个基本示例

问：

在编写这段代码时，我试图通过制作一个基本示例来验证我对 SwiftData 的了解。

这工作原理：

import SwiftUI

@main
struct WWPDApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
                
        }
        // this makes modelContext available in the app
        .modelContainer(for: Memo.self)
    }
}

struct ContentView: View {
    // for getting swiftdata
    @Query private var memos: [Memo]
    // for setting swiftdata
    @Environment(\.modelContext) var modelContext
    
    var body: some View {
        
        VStack {
            Button("ADD MEMO") {
                modelContext.insert(Memo(name: "new memo"))
            }
            List(memos) {memo in
                Text(memo.name)
            }
        }
        .padding()
    }
}

// Putting "@Model" here makes this class work with swift data
@Model
final class Memo {
    
    var id: UUID
    var name: String
    
    init(id: UUID = UUID(), name: String) {
        self.id = id
        self.name = name
    }
    
}

这有效并验证了我们可以添加新对象并保存它们。

但是，我想验证并理解编辑/绑定方面。

我知道modelContext仅用于插入新对象。为了编辑现有对象，我们将依赖于与查询数组中包含的对象的双向绑定（？）...

所以我试了一下：

struct ContentView: View {
    // for getting swiftdata
    @Query private var memos: [Memo]
    // for setting swiftdata
    @Environment(\.modelContext) var modelContext
    
    var body: some View {
        
        // need to put some kind of @Bindable thingy here
        
        VStack {
            Button("ADD MEMO") {
                modelContext.insert(Memo(name: "new memo"))
            }
            List(memos) {memo in
                TextField("this doesn't work", text: memo.$name)
            }
        }
        .padding()
    }
}