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I have a view. On the view, I have a textfield and a button. Until the textfield has text, the button is disabled. Currently, I have to enter text into the textfield and THEN press Enter in order to trigger the textfield action to enable the button.

Is there a way to use the textview_did_end_editing method to enable the button?

You can use textfield_did_change:

class TextDelegate (object):
    def textfield_did_change(self, textfield):
        view = textfield.superview
        button = view['button']
        button.enabled = textfield.text != ''

Perfect answer, Omega0.

I usually make the main View the delegate of the various subviews because then you have all other UI elements directly available without redirection.

If the main View is the textfield's delegate then the above code becomes a oneliner:

class MyMainView(ui.View):
    [ ... ]
    def textfield_did_change(self, textfield):
        self.button.enabled = textfield.text != ''

Thanks!