MATLAB: How to close the figure contain the uifigure after the alert is closed

app designerMATLAB

I'm not sure if this only happens to me.

Anyways, I create a simple alert using uifigure:

f = uifigure;
mess = "It seems like you have not loaded the model. Please do so before process further.";
title = "Error 101";    
uialert(f, mess, title);

After pressing OK, the alert would go away, but the figure that contains the alert is still there (and I have to manually close it).

Is there anyway that it would automatically be closed after the user pressing ok? It's so annoying.

Best Answer

The figure you specify does not actually contain the alert. The function only requires an input to determine where the alert box should be displayed. The code below makes sure to close the figure after the alert box is closed.

f = uifigure;
mess = "It seems like you have not loaded the model. Please do so before process further.";
title = "Error 101";    
uialert(f, mess, title,'CloseFcn',@(h,e) close(f));

Related Solutions

MATLAB: Should i not use msgbox in App Designer

uialert() was designed to work will app designer and has several nice features. For example,

the first input to uialert is the handle to your app figure (app.UIFigure) so that the alert appears on top of the app no matter where its postion is on the screen.
The default 'modal' value for uialert is 'true' which means your app is disabled until the user interacts with the alert. For msgbox, the default create-mode is non-modal which means the msgbox will not prevent further user interaction.
There's also some nice built-in icons available with uialert and its general aesthetic matches app designer better than msgbox.
uialert has an optional close request callback function that you can define and it executes when the alert window is closed.

MATLAB: How to modified “edit fied (text)” from app design

Add this to the value changed callback, adjust the name of your field.

if length(app.EditField.Value) <= 20
    Text = app.EditField.Value; % If you will use the text

else
%     app.EditField.Value = ''; % you can clear out the text if needed

    f = uifigure;
    Error_Msg = "Error message"
    Error_Title = "Error title";
    uialert(f, Error_Msg, Error_Title,'CloseFcn',@(h,e) close(f));
end

It takes a little bit of time to display the message, if that is an issue, then you can use tooltip, I have no example with tooltip.

Above portion of code creates a new figure which takes a bit of time. Here's a better solution with help from Adam.

if length(app.EditField.Value) <= 20
    Text = app.EditField.Value; % If you will use the text
else
%     app.EditField.Value = ''; % you can clear out the text if needed
    f = app.UIFigure; % f is handle to your app UI figure  
    Error_Msg = "Error message"
    Error_Title = "Error title";
    uialert(f, Error_Msg, Error_Title);
end

Best Answer

Related Solutions

MATLAB: Should i not use msgbox in App Designer

MATLAB: How to modified “edit fied (text)” from app design

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