Swift - Xcode complaining about extra argument - NSDate initialisation

Question

I'm simply trying to initialise an NSDate object from epoch. I have a dictionary object of type Dictionary<String, AnyObject> and I know that this key corresponds to an Int

But the Swift compiler is complaining that the NSDate line has an Extra argument 'timeIntervalSince1970' in call

 if let respondedDate : Int = (responseDict["expiry_date"] as AnyObject) as? Int {
     let expiryDate = NSDate(timeIntervalSince1970: respondedDate)
 }

No idea what I am doing wrong here, this seems completely correct to me. Any ideas?

Thanks for the timely response. Here's the working code!

if let respondedDate : NSTimeInterval = (responseDict["expiry_date"] as AnyObject) as? NSTimeInterval {
    let expiryDate = NSDate(timeIntervalSince1970: respondedDate)
}

Hopefully Xcode will be updated soon to make this error more descriptive rather than telling me that the there's an "extra argument"

Answer 1

It's expecting respondedDate to be a NSTimeInterval which is a Double. If you cast respondedDate to NSTimeInterval instead it should work.

Answer 2

Declare respondedDate as an NSTimeInterval instead of an Int. Swift is strongly typed, so it isn't able to automatically cast an Int to NSTimeInterval (which is a typealias for Double).