How to share variables between button functions in App Designer?

In the attached code (I wrote a simplified version below to highlight what I'm trying to do) made in App Designer I have two buttons that each have callbacks. I'd like to be able to share my two variables 'app.roll' and 'app.tilt' between my two functions. No matter what combination of app or comp I use to prefix the variables the second function doesn't get the variable after the first is run. How do I correctly share variables?

% Callbacks that handle component events
methods (Access = private)

% Button pushed function: ImportGPSDataButton
function AddButtonPushedFcn(comp, event)
    app.roll = 2
    app.tilt = 3
end

% Button pushed function: ExportTiltAnglesButton
function ExportTiltData(comp, event)
    comp.ImportGPSDataButton.app.tilt
    end
end

Answer 1

[millercommamatt]

You want to store these variable as a Property.

https://www.mathworks.com/help/matlab/creating_guis/share-data-across-callbacks-in-app-designer.html