MATLAB: App Designer button callback

app designercallbackslamp

function GOButtonPushed(app, event)
    app.Lamp.Color = 'yellow';
    % Some long computation.
    app.Lamp.Color = 'green';
 end

If I have the above code the lamp never turns yellow. It seems like the UI doensn't refresh until the entire callback finishes.

Is there a way to fix this?

Best Answer

You can force a graphics update with drawnow, or by introducing a small pause (in general I see people using pause(0.01) or a similar amount of time). Either will flush the queue of graphics updates.

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MATLAB: Plotting in App designer

x = 1:10;
y = sin(x);
plot(app.UIAxes,x,y);

MATLAB: Error using MQTT callbacks in AppDesigner

If you wish to use a private method of an App Designer App as callback, please define your callback by referring to @app.myCallbackMethod. Further, make sure then that myCallbackMethod has a function signature:

function myCallbackMethod(app, input1AsNormallyExpectedByCallback, input2AsNormallyExpectedByCallback, inputNAsNormallyExpectedByCallback, etc)

So in your specific case:

function subscribe_regCallback(app,myMQTT)
    % Refer to @app.myMQTT_RdAllPow_Callback
    app.RdAllPow = subscribe(myMQTT, 'VGA/RdAllPow', 'QoS', 0, 'Callback', @app.myMQTT_RdAllPow_Callback);
end
% For a MQTT callback two inputs are expected, make sure you 
% really define them both and also add app as first input
function myMQTT_RdAllPow_Callback(app,topic,data)
            app.ConnectedLamp.Color = 'yellow';

Best Answer

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MATLAB: Plotting in App designer

MATLAB: Error using MQTT callbacks in AppDesigner

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