App Designer: Bug in Spinner

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Tom DeLonge
Tom DeLonge 2019-4-9
评论： Tom DeLonge 2023-2-5
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:
  1. Create a blank app in app designer
  2. Add a spinner component and a numerical edit field
  3. 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?
  2 个评论
Garv Asrani
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
Tom DeLonge 2023-2-5
Hi Garv,
no, I still have not been able to resolve this issue.

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