Icon not appearing in app

Question

Peter 2024-4-10

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https://ww2.mathworks.cn/matlabcentral/answers/2105076-icon-not-appearing-in-app

回答： Peter 2024-5-1

Hi,

I am creating an app (for the first time) and the following is just a demo. I have defined an icon which appears in the button as you can see below. I'm also expecting it to appear on the top banner. I'm assuming that's what the settings were for.

App appearance

CatedemoUIFigure settings

Code snippet for creation

 % Component initialization
  methods (Access = private)
    % Create UIFigure and components
    function createComponents(app)
      % Get the file path for locating images
      pathToMLAPP = fileparts(mfilename('fullpath'));
      % Create CatedemoUIFigure and hide until all components are created
      app.CatedemoUIFigure = uifigure('Visible', 'off');
      app.CatedemoUIFigure.Position = [100 100 161 322];
      app.CatedemoUIFigure.Name = 'Cate demo';
      app.CatedemoUIFigure.Icon = fullfile(pathToMLAPP, 'cellxica.png');
      app.CatedemoUIFigure.Tag = 'icon';

Code snippet after all components are created

 % Show the figure after all components are created
      app.CatedemoUIFigure.Visible = 'on';

Thank you.

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Peter 2024-4-10

在 MATLAB Online 中打开

Thank you for the reply.

The png is OK as it renders in the button.

It's definately in the same folder.

The path is included by the app designer and it is immutable.

% Get the file path for locating images
      pathToMLAPP = fileparts(mfilename('fullpath'));

The top if the app only has the title and a close button. I was expecting a minimize and maximize too. Perhaps the place holder for the image is missing so it has nowhere to render it to?

Peter 2024-4-11

It appears that I have misinterpreted which icon this is. It does apper as the image when doing Alt-Tab, switching between applications.

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Answer 1

Peter 2024-4-11

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The icon is for displaying with Alt-Tab.

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Answer 2

prabhat kumar sharma 2024-4-14

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Hi Peter,

If you'd like the same icon to appear in the top banner as well, you'll need to set the Icon property within the Identifier section of app.UIFigure.

Hope this helps!

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Peter 2024-4-15

Hi Prabhat,

Thank you for your reply. This is what I was expecting but only the applications icon is changed (e.g. alt-tab). The app designer does not give a minimise or maximise button on the top banner by default. There is a Matlab example...

f = msgbox("Operation Completed");

Which the demo should look like this...