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(App Designer) set the dropdown with variable

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Yu Li
Yu Li on 2 Apr 2018
Answered: Prasanth Sunkara on 10 Apr 2018
I'm new to Matlab App Designer. I created a drop down buttom and want to set it with desired string variables.
I set like below picture but after run the app, the variables were not appeared in the drop down selections.
is there any mistake with my operation?
Thanks

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Answers (1)

Prasanth Sunkara
Prasanth Sunkara on 10 Apr 2018
The reason for this behavior is that the values are set in the DropDownValueChanged instead of startupFcn.
If your intention is to initialize the values of the drop-down programmatically, you need to do that in ' startupFcn ' callback.
Alternatively, you can initialize the UI values directly from UI configuration parameters of the 'Design View'. However, I would personally recommend using the 'startupFcn' approach.
A quick tip: Why are you creating a new dropdown UI (check your 2 and 3 line numbers of your code) instead of updating the values?
Consider using the below approach.
function startupFcn(app)
value = app.DropDown.Value;
app.DropDown.Items = {'Red','Blue'};
end
Thanks, Prasanth

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