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你在开发过程中常用到哪些定时器,定时器时间会有误差吗,如果有,为什么会有误差?
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Opened this issue
2024-07-29 16:18
<p style="text-align: start;">iOS中常NSTimer、CADisplayLink、GCD定时器,其中NSTimer、CADisplayLink基于NSRunLoop实现,故存在误差,GCD定时器只依赖系统内核,相对一前两者是比较准时的。</p><p style="text-align: start;">误差原因是:与NSRunLoop机制有关, 因为RunLoop每跑完一次圈再去检查当前累计时间是否已经达到定时设置的间隔时间,如果未达到,RunLoop将进入下一轮任务,待任务结束之后再去检查当前累计时间,而此时的累计时间可能已经超过了定时器的间隔时间,故会存在误差。</p>
<p style="text-align: start;">iOS中常NSTimer、CADisplayLink、GCD定时器,其中NSTimer、CADisplayLink基于NSRunLoop实现,故存在误差,GCD定时器只依赖系统内核,相对一前两者是比较准时的。</p><p style="text-align: start;">误差原因是:与NSRunLoop机制有关, 因为RunLoop每跑完一次圈再去检查当前累计时间是否已经达到定时设置的间隔时间,如果未达到,RunLoop将进入下一轮任务,待任务结束之后再去检查当前累计时间,而此时的累计时间可能已经超过了定时器的间隔时间,故会存在误差。</p>
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