Framework7 app auto dark theme

Hi,
I have my app almost finished but have a small problem with auto dark theme.
Is there a way to “capture” the change so I can change the styling on some of my elements?
As an example, I have a tabbar with the icon text set to black (as the default grey doesn’t fit in with the app style). When dark mode is enabled on the mobile I would like to change them to white (so they are visible).
Framework7 has a property, app.darkTheme, is there a way to check for this property so I can then change the class of the icon text?
I have also set the page colour to white which stays white in dark mode so would want to change this to black when dark mode is enabled.
Is this possible?
Thanks,
Paul.