按日期从核心数据中对TableView进行排序-Swift4

Question

I'm trying to sort a UITableView by Date, that's coming from core data.

Getting data from core data

func getData() {
    let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
    do {
    tasks = try context.fetch(Task.fetchRequest())
    }
    catch{
        print("Fetching Failed")
    }
}

Giving data out

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "customCell") as! CustomTableViewCell

    let task = tasks[indexPath.row]


    let dateRangeStart = Date()
    let dateRangeEnd = task.Datum
    let components = Calendar.current.dateComponents([.year, .weekOfYear, .month, .day], from: dateRangeStart, to: dateRangeEnd!)


    cell.name.text = task.name
    cell.dayLeft.text = "\(components.month ?? 0)M \(components.weekOfYear ?? 0)W \(components.day ?? 0)D"

    return cell
}

I tried things i found on stackoverflow like

meetingsData.sort({ $0.meetingDate.compare($1.meetingDate) == .OrderedAscending })

But I did not get it to work.. I'm quiet new to Swift/Programming so if someone could help me there. I think its cause of my "Array design"

Answer 1

You can fetch the data and sort the resulting array. But since you're using Core Data, you could just tell Core Data to give you a sorted array in the first place. Use a sort descriptor on your fetch request. For your property aDatum , you'd use something like

let sortDescriptor = NSSortDescriptor(key: "aDatum", ascending: true)
fetchRequest.sortDescriptors = [sortDescriptor]

Then when you do your fetch, the resulting array will already be sorted by aDatum .

Answer 2

您可以这样操作：

let sortedMeetingData = meetingData.sorted{ $0.meetingDate < $1.meetingDate }

Answer 3

Thanks to Moe, for the quick answer. That's my solution now.

let sortedData = tasks.sorted{ $0.aDatum! < $1.aDatum! }

let sort = sortedData[indexPath.row]

Now the Array is sorted by Date - Give out Data:

cell.name.text = sort.name
cell.lable.text = sort.lable
....