TimeInterval+playbackString.swift

TimeInterval+playbackString.swift

extension TimeInterval {
    
    var playbackString: String {
        if self.isNaN {
            return "??"
        }
        var seconds = self
        var mins = Int((seconds / 60).rounded(.down))
        seconds = seconds.truncatingRemainder(dividingBy: 60)
        
        let hours = mins / 60
        mins = mins % 60
        
        var str = ""
        if mins == 0 && hours == 0 {
            str = String(format: "%.2fs", seconds)
        } else {
            str = String(format: "%02d:%02d", mins, Int(seconds))
            if hours > 0 {
                let hoursPart = String(format: "%d:", hours)
                str = hoursPart + str
            }
        }
        return str
    }
}

print(TimeInterval(2).playbackString)
// 2.00s
print(TimeInterval(62).playbackString)
// 01:02
print(TimeInterval(3762).playbackString)
// 1:02:42

print(TimeInterval(213762).playbackString)
// 1:02:42

print(TimeInterval(Double.nan).playbackString)
// ??