CODEWITHSUNDEEP
iosjsonswift
dyatesupnorth
dyatesupnorth

Reputation: 830

Swift Unable to store JSON String as Date

I have an NSManagedObject Subclass that has a dateOfBirth field in it.

@NSManaged var dateOfBirth: NSDate

Elsewhere, I am downloading a load of JSON strings and I need to fill my dateOfBirth field with the downloaded JSON version. I thought I had this figured, but later when I went to use the value it wsa nil, even though the value I was getting returned from the JSON was there.

Since then I've tried all sorts of incantations to try and get the thing to save.

 //This is my latest 'attempt', trying to downcast the value to NSDate, it fails, originally i was just getting the .string value and converting it to a date
 if let dateOfBirth = object["json"]["dateOfBirth"].stringValue as? NSDate{

  //I actually had this formatter near the top of the function but thought perhaps it wasn't saving because the formatter was inaccessible or something?

            let formatter = NSDateFormatter()
            formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSS"

//This value returns correctly
            println("dateOfBirth? : \(dateOfBirth)")
            newSurveyObj.dateOfBirth = dateOfBirth

//This returns a nil for the dateOfBirth
            println("newSurveyObj? : \(newSurveyObj.dateOfBirth)")
        }

The weird thing is, I can store dates in a similar fashion elsewhere in the app,

for example this:

if let createdDate = object["createdDate"].string
    {

        newWorkObj.createdDate = formatter.dateFromString(createdDate)!
    }

works, with this being its NSManagedObject Sub Class:

    @NSManaged var createdDate: NSDate

Does anybody have any ideas why my dateOfBirth wont save?

edit: The output I am getting for this:

 if let dateOfBirth = object["json"]["dateOfBirth"].string{

                let formatter = NSDateFormatter()
                formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSS"
                println("dateOfBirth? : \(dateOfBirth)")
                newEcoObj.dateOfBirth = formatter.dateFromString(dateOfBirth)!
                println("newSurveyObj? : \(newSurveyObj.dateOfBirth)")
            }

is this:

dateOfBirth? : 1995-01-01T00:00:00
fatal error: unexpectedly found nil while unwrapping an Optional value

However, when I declare the dateOfBirth as optional, I get this output:

dateOfBirth? : 1995-01-01T00:00:00
newSurveyObj? : nil for Street name

Upvotes: 0

Views: 343

Answers (2)

Larme
Larme

Reputation: 26036

The dateFormat of the NSDateFormatter (yyyy-MM-dd'T'HH:mm:ss.SSS) doesn't match string you get 1995-01-01T00:00:00.

You need to remove the extra .SSS => yyyy-MM-dd'T'HH:mm:ss to have a match.

Upvotes: 2

Kristoffer
Kristoffer

Reputation: 440

Wouldn't the if statement expression always return false?

object["json"]["dateOfBirth"].stringValue as? NSDate

You are specifically getting a string and then try to cast it to an NSDate. Pretty sure that will always fail.

In your other example you are specifically parsing the string to a date when you set it

Upvotes: 0

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