Why does uiwait not work during startupFcn?

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James Moore
James Moore 2023-6-12
编辑： Cris LaPierre 2023-6-13
I have a function in my app that I use to pause the program and show an alert. Most of the time it works without issue.
function PauseAlert(app, msg, title, icon)
if nargin < 4
icon = 'error';
end
beep;
uialert(app.UIFigure, msg, title,'CloseFcn','uiresume(gcbf)','Icon',icon);
drawnow;
figure(app.UIFigure);
uiwait(gcbf);
end
However, if it try to use it from within the startupFcn, the program halts on the last line with the following error message:
Error using uiwait (line 48)
Input argument must be of type figure
And it gives another error when I close the uialert message:
Warning: Error while evaluating 'CloseFcn' for dialog.
Error using uiresume (line 26)
Argument must be a Figure object.
I could probably do something like the following:
if ishghandle(h)
uiwait(gcbf)
end
but then the program wouldn't pause like I want it to.

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采纳的回答

Cris LaPierre
Cris LaPierre 2023-6-12
It sounds like the figure gcbf does not yet exist when you try to call uiwait.
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Cris LaPierre
Cris LaPierre 2023-6-13
Just a note that this code also works in R2023a as well. For whatever reason, when I was testing it yesterday, it did not.
James Moore
James Moore 2023-6-13
Yes this works for me as well. Thanks for your help, I'll mark this answer as accepted.

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