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

In Swift 2, iOS 8+. This makes sure we only show hour when necessary

func format(duration: NSTimeInterval) -> String {
  let formatter = NSDateComponentsFormatter()
  formatter.zeroFormattingBehavior = .Pad

  if duration >= 3600 {
    formatter.allowedUnits = [.Hour, .Minute, .Second]
  } else {
    formatter.allowedUnits = [.Minute, .Second]
  }

  return formatter.stringFromTimeInterval(duration) ?? ""
}

So you have

print(format(12)) // 0:12
print(format(65)) // 1:05
print(format(1750)) // 29:10
print(format(3890)) // 1:04:50
print(format(45720)) // 12:42:00