如何在swift 2.2中休眠几毫秒? [英] How to sleep for few milliseconds in swift 2.2?

问题描述

请有人告诉我如何在 swift 2.2 中使用 sleep() 几毫秒?

please anyone tell me how to use sleep() for few milliseconds in swift 2.2?

while (true){
    print("sleep for 0.002 seconds.")
    sleep(0.002) // not working
}

但是

while (true){
    print("sleep for 2 seconds.")
    sleep(2) // working
}

它正在工作.

推荐答案

usleep() 需要百万分之一秒

usleep() takes millionths of a second

usleep(1000000) //will sleep for 1 second
usleep(2000) //will sleep for .002 seconds

或

 let ms = 1000
 usleep(useconds_t(2 * ms)) //will sleep for 2 milliseconds (.002 seconds)

或

let second: Double = 1000000
usleep(useconds_t(0.002 * second)) //will sleep for 2 milliseconds (.002 seconds)

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