获取iOS设备开机时间

首先包含头文件
#include <sys/sysctl.h>

- (time_t)uptimeFun{
//获取方法,单位是秒
    struct
timeval boottime;
    int mib[2] = {CTL_KERN,
KERN_BOOTTIME};
    size_t size =
sizeof(boottime);
    time_t now;
    time_t uptime = -1;
    (void)time(&now);
    if (sysctl(mib,
2, &boottime, &size, NULL,
0) != -1 && boottime.tv_sec !=
0){
        uptime = now - boottime.tv_sec;
    }
    return uptime;
}