Question

下面的代码在删除TextField（）时抛出索引超出范围错误，但在删除Text（）时不会抛出索引超出范围。

这是完整的错误：致命错误：索引超出范围：文件Swift / ContiguousArrayBuffer.swift，第444行

import SwiftUI

struct Information: Identifiable {
    let id: UUID
    var title: String
}

struct ContentView: View {

    @State var infoList = [
        Information(id: UUID(), title: "Word"),
        Information(id: UUID(), title: "Words"),
        Information(id: UUID(), title: "Wording"),
    ]


var body: some View {
    
    Form {
        ForEach(0..<infoList.count, id: \.self){ item in
            Section{
                
                
//                    Text(infoList[item].title) //<-- this doesn't throw error when deleted
                
                    TextField(infoList[item].title, text: $infoList[item].title)
            
            }
        }.onDelete(perform: deleteItem)
    }

}

    private func deleteItem(at indexSet: IndexSet) {
        self.infoList.remove(atOffsets: indexSet)
    }
}

Answer 1

@Asperi's response about creating a dynamic container是正确的。我只需要进行一些调整，使其与Identifiable兼容。最终代码如下：

import SwiftUI

struct Information: Identifiable {
let id: UUID
var title: String

}

struct ContentView: View {

@State var infoList = [
    Information(id: UUID(), title: "Word"),
    Information(id: UUID(), title: "Words"),
    Information(id: UUID(), title: "Wording"),
]




var body: some View {
    
    Form {
        ForEach(0..<infoList.count, id: \.self){ item in
            
            EditorView(container: self.$infoList, index: item, text: infoList[item].title)
                
            
        }.onDelete(perform: deleteItem)

      
    }

}

private func deleteItem(at indexSet: IndexSet) {
    
    
    
    self.infoList.remove(atOffsets: indexSet)
}
}


struct EditorView : View {
var container: Binding<[Information]>
var index: Int

@State var text: String

var body: some View {
    TextField("", text: self.$text, onCommit: {
        self.container.wrappedValue[self.index] = Information(id: UUID(), title: text)
    })
}
}

SwiftUI：删除TextField（）而不删除Text（）时，索引超出范围

1 个答案: