NSTimeInterval to HH:mm:ss?

Question

If I have an NSTimeInterval that is set to say 200.0, is there a way to convert that into 00:03:20, I was thinking I could initialise an NSDate with it and then use NSDateFo

Answer 1

To "extend" Matthias Bauch's suggestion, in Swift I would make this a computed property of NSTimeInterval:

extension NSTimeInterval {
  var stringValue: String {
    let interval = Int(self)
    let seconds = interval % 60
    let minutes = (interval / 60) % 60
    let hours = (interval / 3600)
    return String(format: "%02d:%02d:%02d", hours, minutes, seconds)
  }
}

The advantage of this is it's attached to the NSTimeInterval type, not your view controller or wherever else you put that function. To use you'd go something like:

let timeInterval = NSDate().timeIntervalSinceDate(start)        
self.elapsedTimeLabel.text = timeInterval.stringValue