Is there a way to keep the sorting in core data in the time order the objects are added? [duplicate]

问题

This question already has an answer here:

How to sort Core Data array based on Date Entered (1 answer)

Closed 23 days ago.

If I just add mocked data to coreData like this:

func mockData() {´
    let entity = NSEntityDescription.entity(forEntityName: "LocalDoorCoreDataObject", in: context)

    for i in 1...3 {
        var myEntity = MyCoreDataObject(entity: entity!, insertInto: context)
        myEntity.dName = "MOCKED NAME \(i)"
        }
    }

But when I fetch the data it's not ordered 1, 2, 3, but is rather listed randomly. Is there a way to store and fetch the data exactly in the order you store it to the coreData? This is important since I want to be able to rearrange the order of the cells by dragging them to a different place, then storing the changes to coreDatabase.

回答1:

1. In the NSManagedObject subclass add an attribute (of course also in the model)

   @NSManaged var itemAdded : Date
   

2. Override awakeFromInsert

   override func awakeFromInsert() {
       super.awakeFromInsert()
       itemAdded = Date()
   }
   

Now you can sort by itemAdded

来源：https://stackoverflow.com/questions/61955435/is-there-a-way-to-keep-the-sorting-in-core-data-in-the-time-order-the-objects-ar