Question

这是我在开发SwiftUI应用程序时遇到的错误的概念证明，该程序需要在视图之间同步数据，这就是我使用ObservedObject和Binding的原因。

这是应用程序的代码

import SwiftUI

struct Person: Hashable{
    var id: String
    var name: String
}

class People: ObservableObject{
    @Published var items: [Person]

    init (){
        self.items = [
            Person(id: "1", name: "Juan"),
            Person(id: "2", name: "Javier"),
            Person(id: "3", name: "Alvaro")
            ].sorted(by:{$0.name < $1.name})
    }
}

struct ContentView: View {
    @ObservedObject var people = People()
    var body: some View {
        NavigationView{
            List{
                ForEach(Array(people.items.enumerated()), id: \.1.id) { (index, _) in
                    NavigationLink(destination: PersonDetailView(person:Binding(
                    get: { self.people.items[index] },
                    set: { self.people.items[index] = $0 }))){
                        PersonListRowView(person: self.$people.items[index])
                    }
                }
            }
            .navigationBarTitle("People", displayMode: .large)
            .navigationBarItems(trailing:
                Button(
                    action: {
                        self.people.items.removeLast()
                },
                    label: { Image(systemName: "trash")
                        .frame(width: 30, height: 30)
                }
                )
            )
        }
    }
}

struct PersonListRowView: View {
    @Binding var person: Person

    var body: some View {
        Text("\(person.name)")
    }
}

struct PersonDetailView: View {
    @Binding var person: Person
    var body: some View {
        VStack{
            Text("My name is \(self.person.name)")
            Button("Change name"){
                self.person.name = "Pepe"
            }
        }

    }
}

当我在列表中删除一个人（单击垃圾箱图标）时，出现问题，我收到一个错误，应用崩溃了。

在玩了很多游戏并且看了很多文章之后，我发现这个问题与Using ForEach loop with Binding causes index out of range when array shrinks (SwiftUI)十分相似，但是我使用了NavigationLink，正是这个原因导致了问题。如果您对NavigationLink进行注释，则在删除项目时应用程序会平稳运行

有什么线索，怎么解决？

索引超出范围在SwiftUI中使用ForEach和NavigationLink缩小数组

0 个答案: