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Ok, I feel foolish, I was after this functionality for a long time in pyui files and it's just been sitting there, God knows for how long. Maybe 1.6 😱

So, if you create a pyui file in the designer. Add a Custom View Control from the add menu to it. Then in the Custom View Class (property sheet) for that view in designer, add the class name of a Custom uiView that you have defined in your code.

Presto, that class is the class used as the ui.View.

Look, I know many just know this. But there are so many things that are possible, hard to keep up with it all.

Anyway, below is sample code. Just need to create a pyui file. Very simple one.

import ui

class OwnerDrawn(ui.View):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)   

    def draw(self):
        s = ui.Path.oval(*self.bounds)
        ui.set_color('red')
        s.fill()

if __name__ == '__main__':
    w, h = 600, 800
    f = (0, 0, w, h)
    # load a standard pyui file as normal. In the pyui file, there is
    # a custom View Control. its Custom View Class property in the 
    # pyui file is set to OwnerDrawn.  
    v = ui.load_view('Search_bar')
    v.present('sheet')

This has been there since before 1.6. It was in 1.5, iirc.

@Webmaster4o , lol does not surprise me. But let's face it a lot of little treasures in Pythonista.
I wish they could all be documented, but I understand why they are not. It would take a big chunk out of the development time. I can't remember how long I have had Pythonista now, but I am astounded how much it has evolved in that short time.