有没有办法获得相机流的iOS上的亮度级别？

I am using the iPhone/iPad camera to get a video stream and doing recognition on the stream, but with lighting changes it has a negative impact on the robustness. I have tested different settings in different light and can get it to work, but trying to get the settings to adjust at run time is what I need.I am using the iPhone/iPad camera to get a vide