Radio button issue in App Designer

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Sri Janani
Sri Janani 2025-8-5
编辑： Image Analyst 2025-8-6
I am working in App designer and I have included a radio button group in my GUI. In that one button is automatically selected while opening it. I want nothing to be selected at the start. How can i do that?
Thanks in advance

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dpb
dpb 2025-8-5
编辑：dpb 2025-8-5
Short answer is "you can't". One button in a uibuttongroup is always selected; MATLAB internal code will set the next one (in added order) if the selected one is programmatically deselected. By default the first in the group is the selected one.
Having none selected is not an allowed state in the design as implemented.
Even if you get clever and try to fool Mother MATLAB by having only one button in the group, one finds
>> hUIF=uifigure();
>> hUIRB=uiradiobutton(hUIF);
>> hUIRB.Value=0;
Error using matlab.ui.control.internal.model.AbstractMutualExclusiveComponent/set.Value (line 134)
'Value' cannot be set to false because it is the only component of class 'matlab.ui.control.RadioButton' or 'matlab.ui.control.ToggleButton' in the container.
>>
ADDENDUM:
And, creating the one radiobutton as above also automagically creates the uibuttongroup container, so there is no such thing as an independent radio button outside the container.
As @Image Analyst says, you will have to accept the behavior as it is to use radio buttons or select another interface scheme/control.

更多回答（1 个）

Image Analyst
Image Analyst 2025-8-5
编辑：Image Analyst 2025-8-6
@dpb says he also tried it and you can't. So I suggest, if you really want to do that, you use a different control such as a set of checkboxes or a multi-selection listbox.
I've also used a drop down list where the first item is "Select whatever" and then the list of option names follows below that. Then you can check the .Value property of the list and act upon whatever is there.
selectedItemName = app.dropdown1.Value;
if contains(selectedItemName, 'Select')
msgbox('Select a different choice!');
elseif contains(selectedItemName, 'Choice 1')
msgbox('You chose choice1');
elseif contains(selectedItemName, 'Choice 2')
msgbox('You chose choice 2');
end

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