在一个类中拥有两个 NSTimer 会导致它们不太准确吗？
我有一个 NSTimer，它是我的主游戏循环，它每秒调用 60 次。我有另一个计时器，它是一个倒计时，每秒被调用 0.001 次。定时器不准确正常吗？或者我应该每秒调用倒数计时器更少的次数？
I have one NSTimer which is my main game loop, it calls 60 times a second. I have another timer which is a countdown, which gets called 0.001 times a second. Is it normal that timer is not accurate? or should i call the countdown timer fewer times per second?
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NSTimers 不准确。您指定的时间间隔只是一个目标。 NSTimer 将尝试达到该目标，但是在该线程上运行的东西越多，循环时间就越慢。您的 0.001 计时器可能运行得太快而无法使用，并且会出现准确性问题。如果您需要实时准确性，则必须使用 NSDate 跟踪计时器实际触发的时间并进行相应补偿。
NSTimers are not accurate. The time interval you specify is simply a goal. The NSTimer will try to hit that goal but the more stuff you have running on that thread the slower the cycle time will be. Your 0.001 timer is probably going way too fast to be useful and will suffer from accuracy problems. If you need real time accuracy you will have to track what time the timer is actually firing with an NSDate and compensate accordingly.
如果我正确地阅读你的问题，第二个计时器（我假设每 0.001 秒触发一次）将不会准确。
NSTimer 的分辨率约为50-100 毫秒（0.05s-0.1s），如果加载运行循环，这可能会受到显着影响。
If I'm reading your question correctly the second timer (which I assume is fired every 0.001) seconds is not going to be accurate.
NSTimer has a resolution of about 50-100 milliseconds (0.05s-0.1s) and this can be significantly impacted if your run loop is loaded.