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I use it for pdf covers as buttons images.

from   objc_util import *
import ui

def GetUIImageOfPDFPage(path,pageid=1):
    UIGraphicsGetCurrentContext = c.UIGraphicsGetCurrentContext
    UIGraphicsGetCurrentContext.restype = c_void_p
    UIGraphicsGetCurrentContext.argtypes = []

    CGPDFDocumentCreateWithURL = c.CGPDFDocumentCreateWithURL
    CGPDFDocumentCreateWithURL.restype = c_void_p
    CGPDFDocumentCreateWithURL.argtypes = [c_void_p]

    CGPDFDocumentGetNumberOfPages = c.CGPDFDocumentGetNumberOfPages
    CGPDFDocumentGetNumberOfPages.restype = c_void_p
    CGPDFDocumentGetNumberOfPages.argtypes = [c_void_p]

    CGPDFDocumentGetPage = c.CGPDFDocumentGetPage
    CGPDFDocumentGetPage.restype = c_void_p
    CGPDFDocumentGetPage.argtypes = [c_void_p, c_void_p]

    CGPDFPageGetBoxRect= c.CGPDFPageGetBoxRect
    CGPDFPageGetBoxRect.restype = CGRect
    CGPDFPageGetBoxRect.argtypes = [c_void_p,c_void_p]

    CGContextDrawPDFPage = c.CGContextDrawPDFPage
    CGContextDrawPDFPage.restype = None
    CGContextDrawPDFPage.argtypes = [c_void_p,c_void_p]

    ns_url = nsurl(path)
    document = CGPDFDocumentCreateWithURL(ObjCInstance(ns_url))
    #np = CGPDFDocumentGetNumberOfPages(document)
    #print('CGPDFDocumentGetNumberOfPages=',np) # to check if document is ok

    page = CGPDFDocumentGetPage(document,pageid)

    page_mediabox = CGPDFPageGetBoxRect(page,0) # CGPDFBox=0=>kCGPDFMediaBox
    w = page_mediabox.size.width
    h = page_mediabox.size.height
    #print('mediabox=',w,h)         # to check if mediabox is ok

    with ui.ImageContext(w,h) as context:
        cn = UIGraphicsGetCurrentContext()
        CGContextDrawPDFPage(cn,page)
        ui_image = context.get_image()
    return ui_image

# Protect against import    
if __name__ == '__main__':
    full_path = '......pdf'
    ui_image = GetUIImageOfPDFPage(full_path,pageid=40)
    v = ui.ImageView()
    v.image = ui_image
    v.transform = ui.Transform.scale(1,-1)  # CGContext is up/down inverted
    v.present(hide_title_bar=True) 

We can do the transform inside the def via ObjectiveC

from   objc_util import *
import ui

def GetUIImageOfPDFPage(path,pageid=1):
    UIGraphicsGetCurrentContext = c.UIGraphicsGetCurrentContext
    UIGraphicsGetCurrentContext.restype = c_void_p
    UIGraphicsGetCurrentContext.argtypes = []

    CGPDFDocumentCreateWithURL = c.CGPDFDocumentCreateWithURL
    CGPDFDocumentCreateWithURL.restype = c_void_p
    CGPDFDocumentCreateWithURL.argtypes = [c_void_p]

    CGPDFDocumentGetNumberOfPages = c.CGPDFDocumentGetNumberOfPages
    CGPDFDocumentGetNumberOfPages.restype = c_void_p
    CGPDFDocumentGetNumberOfPages.argtypes = [c_void_p]

    CGPDFDocumentGetPage = c.CGPDFDocumentGetPage
    CGPDFDocumentGetPage.restype = c_void_p
    CGPDFDocumentGetPage.argtypes = [c_void_p, c_void_p]

    CGPDFPageGetBoxRect= c.CGPDFPageGetBoxRect
    CGPDFPageGetBoxRect.restype = CGRect
    CGPDFPageGetBoxRect.argtypes = [c_void_p,c_void_p]

    CGContextDrawPDFPage = c.CGContextDrawPDFPage
    CGContextDrawPDFPage.restype = None
    CGContextDrawPDFPage.argtypes = [c_void_p,c_void_p]

    CGContextScaleCTM = c.CGContextScaleCTM
    CGContextScaleCTM.restype =  None
    CGContextScaleCTM.argtypes = [c_void_p, CGFloat, CGFloat]

    CGContextTranslateCTM = c.CGContextTranslateCTM
    CGContextTranslateCTM.restype = None
    CGContextTranslateCTM.argtypes = [c_void_p, CGFloat, CGFloat]

    ns_url = nsurl(path)
    document = CGPDFDocumentCreateWithURL(ObjCInstance(ns_url))
    #np = CGPDFDocumentGetNumberOfPages(document)
    #print('CGPDFDocumentGetNumberOfPages=',np) # to check if document is ok

    page = CGPDFDocumentGetPage(document,pageid)

    kCGPDFMediaBox = 0
    page_mediabox = CGPDFPageGetBoxRect(page,kCGPDFMediaBox)
    w = page_mediabox.size.width
    h = page_mediabox.size.height
    #print('mediabox=',w,h)         # to check if mediabox is ok

    with ui.ImageContext(w,h) as context:
        cn = UIGraphicsGetCurrentContext()
        CGContextTranslateCTM(cn,0.0,h)
        CGContextScaleCTM(cn, 1.0, -1.0)
        CGContextDrawPDFPage(cn,page)
    return ui_image

# Protect against import    
if __name__ == '__main__':
    full_path = '/private/var/mobile/Library/Mobile Documents/iCloud~com~omz-software~Pythonista3/Documents/Mes Livres/Les Blondes - La compil des vacances.pdf'
    ui_image = GetUIImageOfPDFPage(full_path,pageid=40)
    v = ui.ImageView()
    v.image = ui_image
    #v.transform = ui.Transform.scale(1,-1) # CGContext is up/down inverted
    v.present(hide_title_bar=True)