Question

我遇到了问题。我需要使用 .onDelete 函数删除的项目的值。我是新手，我不知道该怎么做。如果有人可以在这里帮助我，那将是很好的。谢谢。

列表：

struct TimeStampList: View {
    
    @EnvironmentObject var user: User
    @ObservedObject var viewModel: SingleEntriesViewModel
    
    var body: some View {
        List {
            ForEach(0..<self.viewModel.timeStamps.count, id: \.self) { timeStamp in
                Section(header: Text("\(TimeStamp.convertToReadableString(date: self.viewModel.timeStamps[timeStamp].date))")) {
                    if (self.viewModel.timeStamps[timeStamp].dayType != "V") {
                        ForEach(self.viewModel.timeStamps[timeStamp].times, id: \.self) { time in
                            SingleEntriesRow(time: time, id: UUID())
                        }.onDelete { times in
                            self.deleteTimeStamps(timeStamp: timeStamp, row: times)
                        }
                    }
                    else {
                        Text("V")
                    }
                }
            }
        }
    }
    
    func deleteTimeStamps(timeStamp: Int, row: IndexSet) {
        self.viewModel.timeStamps[timeStamp].deleteTime(at: row)
        self.viewModel.sortTimeStamps()
        self.viewModel.timeStamps[timeStamp].times[row] // <- I need this but row is of type IndexSet not Int.
    }
}

时间戳记：

struct TimeStamp: Identifiable { 
   var id = UUID() 
   var date: Date 
   var times: [String]
   var dayType: String 
}

ViewModel：

class SingleEntriesViewModel: ObservableObject { 
   @Published var timeStamps = [TimeStamp]() 
}

Answer 1

这是因为IndexSet是类型为Int的索引的集合。

您可以获取第一个索引：

if let index = row.first {
    // index is of type `Int`
    // let result = self.viewModel.timeStamps[timeStamp].times[index]
}

或使用forEach遍历所有索引：

row.forEach { index in
    // index is of type `Int`
    // let result = self.viewModel.timeStamps[timeStamp].times[index]
}

在onDelete函数中获取已删除项目的值

1 个答案: