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@JonB , sorry but this question is mainly directed to you. If anyone else can answer, thank you.
But the code below loads a UIFile/pyui file into a Custom ui.View Class.
If I create a Custom View in the UIFile and set the Custom View Class to UserItem it all works.
But in code, the superview is None.
My question is, is there a way for UserItem, in this case to know it's superview is MyClass?
I have tried some different things. But I just can't get it.
Sorry, I know this is a little vague, but some people will know what I am talking about.

import ui

class UserItem(ui.View):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.make_view()
        print(self.superview)

    def make_view(self):
        pass

class PYUILoader(ui.View):
    def WrapInstance(obj):
        class Wrapper(obj.__class__):
            def __new__(cls):
                return obj
        return Wrapper

    def __init__(self, pyui_fn, *args, **kwargs):
        bindings=globals().copy()
        bindings[self.__class__.__name__]=self.WrapInstance()

        ui.load_view(pyui_fn, bindings)

        # call after so our kwargs modify attrs
        super().__init__(*args, **kwargs)

class MyClass(PYUILoader):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.make_view()

    def make_view(self):
        pass

if __name__ == '__main__':
    w, h = 600, 800
    f = (0, 0, w, h)

    # any UIFile, with a customview added, then for the customview 
    # Custom View Class attr = UserItem 
    ui_file = 'hcard'

    style = 'sheet'

    mc = MyClass(ui_file, frame = f, bg_color = 'white')
    mc.present(style=style)

@Phuket2 In __init__, the view can't know its superview - because of the design of UIKit and the ui module, the superview has to be set indirectly using add_subview on another view, which is only possible after the subview is created. __init__ runs during creation of the view, so the superview can't be set there yet.

You can however define a did_load method in your custom subclass. The ui module's pyui loading mechanism (ui._view_from_dict) calls did_load on each view when it is fully loaded, i. e. after all attributes are set and after it is added to its superview. So you can do anything there that requires access to the superview or other attributes from the pyui file.

@dgelessus , thanks makes sense what you say, and I should have tried did_load. And it works as long as I do it in MyClass and not UserItem which makes sense we'll sort of. Depending on the load order I guess. It's just a shame. Would have been nice to access the superview in the UserItem at some point in the load process.
As an FYI, the name attr does not seem to work in the UserItem. Meaning if I set it, has no effect on its subview name. I am not sure it should in the case, but it seems like it should.
But again thanks. At least I know I am am just not making extra work for myself