1 Reply
      Latest reply on Feb 9, 2017 3:01 PM by eskimo
      yerpy Level 1 Level 1 (0 points)

        Hello how can i unwrap and convert reaming time in good way in Swift3?

            var _date: Date?
            var _lastTimestamp: Date
            self._date = Date()
            let _interval: TimeInterval = self._lastTimestamp ? _date?.timeIntervalSince(_lastTimestamp!): 0


        "Result values in '? :' expression have mismatching types 'TimeInterval?' and 'Int'

        • Re: Mismatching types in time interval
          eskimo Apple Staff Apple Staff (13,895 points)

          The immediate problem you’re having is that self._date is optional, so this construct:


          produces an optional.  My preferred way around that is to use a local non-optional reference and then assign it to self._date when I’m done.

          let now = Date()
          let _interval: TimeInterval = self._lastTimestamp ? now.timeIntervalSince(_lastTimestamp): 0.0
          self._date = now

          But that still won’t compile because the self._lastTimestamp to the left of the ? is not a Boolean and I don’t even have a good guess as what you’re trying to do there.

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