PKCanvasView

[cvp]

Quick and dirty, as usual, but to be tried anyway

from objc_util import *
import ui

import console
import ui
from objc_util import *
import os

@on_main_thread
def main():
	global canvasView
	v = ui.View()
	w,h = ui.get_screen_size()
	#v.frame = (0,0,w,h)
	v.frame = (0,0,400,600)
	
	b_clear = ui.ButtonItem()
	b_clear.title = 'clear'
	def b_clear_action(sender):
		global canvasView
		canvasView.drawing = ObjCClass('PKDrawing').alloc().init()
	b_clear.action = b_clear_action	
	b_save = ui.ButtonItem()
	b_save.title = 'save'
	def b_save_action(sender):
		global canvasView
		img = canvasView.drawing().imageFromRect_scale_(canvasView.frame(),1.0)
		iv = ui.ImageView()
		w,h = 80,120
		iv.frame = (10,10,w,h)
		iv.border_width = 1
		v.add_subview(iv)		
		with ui.ImageContext(w,h) as ctx:
			img.drawInRect_(CGRect(CGPoint(0, 0), CGSize(w,h)))
			iv.image = ctx.get_image()				
	b_save.action = b_save_action		
	v.right_button_items = (b_clear, b_save)
	
	v.present('sheet')
	view = ObjCInstance(v)
	canvasView = ObjCClass('PKCanvasView').alloc().initWithFrame_(view.frame())
	view.addSubview_(canvasView)
	window = view.window()
	toolPicker = ObjCClass('PKToolPicker').alloc().init()
	toolPicker.setVisible_forFirstResponder_(True, canvasView)
	toolPicker.addObserver_(canvasView)
	canvasView.becomeFirstResponder()

main()

[ChelsWin]

Thanks for posting this. It is really helpful.
Would it be possible to save the drawing to camera roll?

[cvp]

@ChelsWin here-after, 3 methods:

1. In Pythonista, using depreciated method
2. In ObjectiveC, without passing via a temporary file
3. In Pythonista, using Photos module, passing via a temporary file because create_image_asset needs a file as parameter

		with ui.ImageContext(w,h) as ctx:
			img.drawInRect_(CGRect(CGPoint(0, 0), CGSize(w,h)))
			iv.image = ctx.get_image()	

		# save ui.Image using depreciated method
		import photos
		photos.save_image(iv.image)

		# save ui.Image in camera roll without passing via a file
		import threading			
		NSBundle.bundleWithPath_('/System/Library/Frameworks/Photos.framework').load()
		PHPhotoLibrary = ObjCClass('PHPhotoLibrary')
		PHAssetChangeRequest = ObjCClass('PHAssetChangeRequest')

		lib = PHPhotoLibrary.sharedPhotoLibrary()
		def change_block():
			req = PHAssetChangeRequest.creationRequestForAssetFromImage_(img)
		def perform_changes():
			lib.performChangesAndWait_error_(change_block, None)
		t = threading.Thread(target=perform_changes)
		t.start()
		t.join()

		# save ui.Image in camera roll, passing via a file
		import photos
		# Save as temporary JPEG file
		path = 'temp.jpg'
		with open(path, 'wb') as f:
			quality = 0.9 # From 0.0 (more compression) to 1.0 (better quality)
			f.write(iv.image.to_jpeg(quality))
		# Save file in camera roll
		photos.create_image_asset(path)
		# Remove temporary file
		os.remove(path)

[ChelsWin]

Awesome. Thanks for the help