Swift 时间戳转换：将秒数转换为时分秒格式字符串

func timeStrWithSecTime(secTime: TimeInterval) -> String {\n let time = Int(secTime)\n if time / 3600 > 0 {\n let hour = time / 3600\n let minute = (time % 3600) / 60\n let second = (time % 3600) % 60\n return String(format: "%02zd:%02zd:%02zd", hour, minute, second)\n } else {\n let minute = time / 60\n let second = time % 60\n return String(format: "%02zd:%02zd", minute, second)\n }\n}