我想从 arkit view（ arscnview ）中拍摄快照，每秒次30次，并且由于CPU使用情况非常重要，因此我尝试不使用计时器或 displayLink ，然后在 session（_ session：arsession：didupdate frax：arframe）中运行“拍摄图像”功能。
但是它通常以60 fps的速度运行，然后在一段时间后达到30 fps。
因此，我尝试将其锁定在30 fps上
sceneView.preferredFramesPerSecond = 30
，但看起来它不起作用，并且仍在60 fps中进行。有什么方法可以一直锁定30 fps（30 ps或更低）。如果没有，我们可以在第一个1-2秒内找到其FPS，以修改其上的图像函数基础（在30 fps中以每个帧运行或在60 fps中的每2帧中运行），
谢谢这么多
I want to take an snapshot from ARKit view (ARSCNView) 30 times per sec, and since the CPU usage is so important in my case, I try to not use Timer or displaylink and instead run the taking image function inside session(_ session: ARSession, didUpdate frame: ARFrame) .
But it normally run in 60 fps and then come to 30 fps after a while.
So I try to lock it on 30 fps
sceneView.preferredFramesPerSecond = 30
But looks like it's not working and it is still doing it in 60 fps. Is there any way to lock it on 30 fps all the time ( 30 ps or lower ). If not, there is any way that we can find out its fps in the first 1-2 sec to modify the taking image function base on it ( run in every frame in 30 fps or run in every 2 frame in 60 fps)
Thank you so much
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