NSProcessInfo().systemUptime is wrong

Question

系统重新启动后，我在获取NSTimeInterval时遇到问题。这个函数给了我一个错误的结果。重新启动时间是在设备的电池充电后重新启动。iPhone 5s和iPad 3（新款）出现问题。我该怎么修？

Answer 1

我使用这个方法，它帮助我

 public static func uptime() -> (days: Int, hrs: Int, mins: Int, secs: Int) {
            var currentTime = time_t()
            var bootTime    = timeval()
            var mib         = [CTL_KERN, KERN_BOOTTIME]
            // NOTE: Use strideof(), NOT sizeof() to account for data structure
            // alignment (padding)
            // http://stackoverflow.com/a/27640066
            // https://devforums.apple.com/message/1086617#1086617
            var size = strideof(timeval)
            let result = sysctl(&mib, u_int(mib.count), &bootTime, &size, nil, 0)
            if result != 0 {
                #if DEBUG
                    print("ERROR - (__FILE__):(__FUNCTION__) - errno = "
                        + "(result)")
                #endif
                return (0, 0, 0, 0)
            }