ios - Finding the distance in points between the top of the phone screen to the start of the image preview in the camera -

I am trying to create a custom camera overlay and move on to know the height of the black toolbar right above the image preview Need a photo Does anyone know how I can go about finding it? I'm guessing tired test and error, but I'm worried that the size is different for different iPhone models. Any help would be really appreciated!

< / Html>