Swift3 根据秒数获取视频时长（转换成00:00:00时间格式）以及将时长转换成秒

直接代码了：

 /// 秒转换成00:00:00格式
    ///
    /// - Parameter secounds: <#secounds description#>
    /// - Returns: <#return value description#>
    class func getFormatPlayTime(secounds:TimeInterval)->String{
        if secounds.isNaN{
            return "00:00"
        }
        var Min = Int(secounds / )
        let Sec = Int(secounds.truncatingRemainder(dividingBy: ))
        var Hour =
        if Min>= {
            Hour = Int(Min / )
            Min = Min - Hour*
            return String(format: "%02d:%02d:%02d", Hour, Min, Sec)
        }
        return String(format: "00:%02d:%02d", Min, Sec)
    }

    /// 根据00:00:00时间格式，转换成秒
    ///
    /// - Parameter str: <#str description#>
    /// - Returns: <#return value description#>
    class func getSecondsFromTimeStr(timeStr:String) -> Int {
        if timeStr.isEmpty {
            return
        }

        let timeArry = timeStr.replacingOccurrences(of: "：", with: ":").components(separatedBy: ":")
        var seconds:Int = 

        if timeArry.count >  && isPurnInt(string: timeArry[]){
            let hh = Int(timeArry[])
            if hh! >  {
                seconds += hh!**
            }
        }
        if timeArry.count >  && isPurnInt(string: timeArry[]){
            let mm = Int(timeArry[])
            if mm! >  {
                seconds += mm!*
            }
        }

        if timeArry.count >  && isPurnInt(string: timeArry[]){
            let ss = Int(timeArry[])
            if ss! >  {
                seconds += ss!
            }
        }

        return seconds

    }

比如：

100s   -> 01:40

01:40  -> 100s

enjoy～