CODEWITHSUNDEEP
swiftcore-datansdate
Enrique
Enrique

Reputation: 303

Convert NSDate to Date

this might be a stupid question, but I can´t find the information. I'm using CoreData in my app, and I save an array of structs. The problem is when I fetch and try to restore it into the struct array, I have a problem with my Date variable; I can't find a way to convert it from NSDate to Date, I try using as Date, but it makes me force downcast and I'm not sure if it's safe. Is it correct? or is there another way?

This is my Struc: 

struct MyData {
        var value = Int()
        var date = Date()
        var take = Int()
        var commnt = String()
    }

This is how I'm fetchin the data: 

func fetchRequestInfo() -> [MyData] {

        let fetchRequest: NSFetchRequest<GlucoseEvents> = GlucoseEvents.fetchRequest()

        do {
            let searchResults = try DatabaseController.getContext().fetch(fetchRequest)

            for result in searchResults as [GlucoseEvents] {
               let value = Int(result.value)
               let date = result.date as Date
               let take = Int(result.take)
               let commnt = String(describing: result.commnt)
                let data = MyData(value: value, date: date, take: take, commnt: commnt)
               self.dataArray.append(data)
                }



            } catch {

                print ("error: \(error)")

            }
        let orderArray = self.dataArray.sorted(by: { $0.date.compare($1.date) == .orderedAscending})
        return orderArray
    }

And this is the how I set the properties of my CoreDataClass:

@NSManaged public var commnt: String?
    @NSManaged public var date: NSDate?
    @NSManaged public var value: Int16
    @NSManaged public var take: Int16

Upvotes: 14

Views: 19745

Answers (3)

Avi Levin
Avi Levin

Reputation: 1868

You can use a function or just an extension:

let nsDate = NSDate() 
let date = Date(timeIntervalSinceReferenceDate: nsDate.timeIntervalSinceReferenceDate)

Upvotes: 1

evya
evya

Reputation: 3647

Just make implicit casting like:

let nsdate = NSDate() 
let date = nsdate as Date

Upvotes: 8

Martin R
Martin R

Reputation: 539775

result.date is an optional NSDate, so you can bridge it to an optional Date:

result.date as Date?

Then use optional binding to safely unwrap it. In your case that could be

guard let date = result.date as Date? else {
    // date is nil, ignore this entry:
    continue
}

You might also want to replace

let commnt = String(describing: result.commnt)

with

guard let commnt = result.commnt else {
    // commnt is nil, ignore this entry:
    continue
}

otherwise you'll get comment strings like Optional(My comment).

(Rule of thumb: String(describing: ...) is almost never what you want, even if the compiler suggests it to make the code compile.)

Upvotes: 19

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