在iOS / Swift获得系统正常运行时间
问题说明
有没有办法让iOS系统正常运行（使用Swift）？我需要的是测量时间而不必担心用户改变时间。在Android中有一个 elapsedCurrentTimeMillis（），它返回自启动以来的毫秒数，但现在我需要类似iOS的东西。这里有一个公认的答案获得iOS系统的正常运行时间，但这不是在睡着时暂停但这是针对目标C而我需要它用于Swift而我不知道如何转换它。
Is there a way to get system uptime in iOS (using Swift)? What I need is to measure time without having to worry about the user changing the time. In Android there's a elapsedCurrentTimeMillis() that returns the number of milliseconds since boot, but now I need something like that for iOS. There's an accepted answer here Getting iOS system uptime, that doesn't pause when asleep but that's for Objective C and I need it for Swift and I don't know how to convert it.
正确答案
当你要求一个纯粹的Swift解决方案时，我从你提到的答案转换了ObjC代码让iOS系统正常运行，睡着时不会暂停。
As you ask for a pure-Swift solution, I converted the ObjC code from the answer you mentioned Getting iOS system uptime, that doesn't pause when asleep.
func uptime() -> time_t {
var boottime = timeval()
var mib: [Int32] = [CTL_KERN, KERN_BOOTTIME]
var size = strideof(timeval)
var now = time_t()
var uptime: time_t = -1
time(&now)
if (sysctl(&mib, 2, &boottime, &size, nil, 0) != -1 && boottime.tv_sec != 0) {
uptime = now - boottime.tv_sec
}
return uptime
}
// print(uptime())
为了让它更漂亮，我们可以使用 sysctlbyname 而不是 sysctl ：
// var mib: [Int32] = [CTL_KERN, KERN_BOOTTIME]
sysctlbyname("kern.boottime", &boottime, &size, nil, 0)
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