When I press next question, it doesn't go to the next question

I'm making a quiz-like game on the app designer section of matlab, where the user can select easy medium hard, which will display different flags for the user to select one of 3 options. I managed to get the first question to appear, but when I added the 'next question' button, the programme does not want to go the next question. Any help would be much appreciated

% Properties that correspond to app components
properties (Access = public)
UIFigure            matlab.ui.Figure
ReturnButton        matlab.ui.control.Button
NextQuestionButton  matlab.ui.control.Button
option3             matlab.ui.control.Button
option2             matlab.ui.control.Button
option1             matlab.ui.control.Button
Label               matlab.ui.control.Label
Image               matlab.ui.control.Image
Button3             matlab.ui.control.Button
Button2             matlab.ui.control.Button
TextToUser          matlab.ui.control.Label
GeographyQuizLabel  matlab.ui.control.Label
Button1             matlab.ui.control.Button
end

properties (Access = private)
Property % Description
counter = 1;
Difficulty = [1,2,3];
end
% Button pushed function: Button1
function Button1Pushed(app, event)
% starts easy games
app.Difficulty = 1;
app.counter = app.counter+1;

app.Label.Text = "What is the country seen below?";
app.Button1.Visible = "off";
app.Button2.Visible = "off";
app.Button3.Visible = "off";
app.TextToUser.Text = "";
app.option1.Visible = "on";
app.option2.Visible = "on";
app.option3.Visible = "on";
app.Image.Visible = "on";

if app.counter == 2
    
    app.Image.ImageSource = "italyFlag.svg.png";
    app.option1.Text = "Italy";
    app.option2.Text = "France";
    app.option3.Text = "Spain";
    
end
% Button pushed function: NextQuestionButton   % The counter should increase by 1 when the next 
function NextQuestionButtonPushed(app, event)

app.counter = app.counter + 1;
if app.Difficulty == 1 && app.counter == 3
    app.Image.ImageSource = "RomaniaFlag.png";
    app.option1.Text = "Chad";
    app.option2.Text = "Bolivia";
    app.option3.Text = "Romania";
end

[Walter Roberson]

Your functions Button1Pushed and NextQuestionButtonPushed are not configured as button pushed callbacks. The functions exist but there is no way to get to them.

Answer 1

[Ishu]

Hi Thomas,

I understand that you are not able to go to next question when you press the "next" button and I am assuming that the functionality of your next button is defined by "NextQuestionButtonPushed" function.

This can be due to the possibility that there may be no callback to the "NextQuestionButtonPushed" function so your next button is not behaving as expected. You can add the callback to these functions in the "startUpFcn" callback to the UIFigure.

methods (Access = private)

        % Code that executes after component creation
        function startupFcn(app)
            % "Next" button creating code
            app.SubmitButton.ButtonPushedFcn = createCallbackFcn(app, @NextQuestionButtonPushed, true);

            %Similarly you can add callback to "Button1Pushed" also
            app.SubmitButton.ButtonPushedFcn = createCallbackFcn(app, @Button1Pushed, true);
        end
end
                

You can add callbacks according to the behaviour of your code.

For more information you can refer below documentation:

https://www.mathworks.com/help/matlab/app-designer.html

Hope it helps.