从 Swift 列表中的行中检索值

发布于08月04日

如何获取列表中选定行的值？

例如:

var data: [String] = []    

List {
   ForEach(0..<data.count, id: \.self) { item in
     HStack {
        Text(data[item])
     }
   }
} //: End of the List

.onDelete(perform: { indexSet in
   // get the value of the row
   // get the corresponding key for the value
   // delete the value by the key from the dictionary
}) //: End of the onDelete

.onAppear {
   let dictionary = //retrieve the data from the database and get a dictionary
   for entry in dictionary {
      data.append(entry.value)
   }
} //: End of the onAppear

如何获取列表中选定行的值？

推荐答案

如果必须获取已删除元素的值，则可以这样try .代码在图像下方.

如果只需要选定元素的值，则只需使用$selection即可.

struct DemoView: View {
@State var list = ["dog", "cat", "turtle"]
@State var atIndex = 0
@State var temp = ""
var body: some View {
    List(selection: $temp) {
        ForEach(list, id: \.self) { sub in
            HStack {
                Text(sub)
            }
        }
        .onDelete { indexSet in
            indexSet.forEach { i in
                atIndex += i
            }
            temp = list[atIndex]
            print("I am going to delete \(temp)")
            list.remove(atOffsets: indexSet)
            atIndex = 0
        }
        Text("Recent deleted value: \(temp)")
    }
  }
}