ios - Screenshot including camera preview -

this code taking screenshot:

uigraphicsbeginimagecontext(view.frame.size)     view.layer.renderincontext(uigraphicsgetcurrentcontext())     let imageref = uigraphicsgetimagefromcurrentimagecontext()     uigraphicsendimagecontext()  

when open camera preview , take screenshot, white view no camera shot. there way include on camera? if doesn't make sense alternative? thank you