App Designer: Bug in Spinner

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Tom DeLonge 2019-4-9

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https://ww2.mathworks.cn/matlabcentral/answers/455221-app-designer-bug-in-spinner

评论： Tom DeLonge 2023-2-5

spinner_bug.m

I think I found a bug in App Designer's spinner. Please find a minimal working example attached. Please rename the file to spinner_bug.mlapp, since this website does not allow for *.mlapp files to be uploaded.

If you do not want to download the file, here is how to create the app yourself:

Create a blank app in app designer
Add a spinner component and a numerical edit field
Add a callback to the ValueChangedFcn of the edit field. Set the spinner's step size according to the numerical edit field.

Now, execute the app. Click the spinner a few times. Then change the spinner step size. Click the spinner again. Notice how the increment is random for the first click. I tried this in 2018a and 2019a.

Can anyone suggest a workaround?

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Garv Asrani 2023-2-1

Hi Tom DeLonge

I have the same issue. I changed the step size to a non integer value from default 1 and after compilation when I click on the up arrow key it steps from 1 to 0 and then takes the increment of the decimal step value (1.8 in my case). When I manually delete the value in text field and enter 0, the step behaviour works as expected with increments of chosen step size. I have this bug in 2022b.

Were you able to resolve the issue?

Thanks!

Tom DeLonge 2023-2-5