How to assign the value of an ui.control element to a variable in public property in App Designer

Question

Fabian Lürßen 2021-5-24

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/838128-how-to-assign-the-value-of-an-ui-control-element-to-a-variable-in-public-property-in-app-designer

编辑： Mario Malic 2021-5-24

Hi,

in my callbacks I can simply say:

% Button pushed function: StartButton
        function StartButtonPushed(app, event)
                A = app.Spinner1.Value;

But now I need to define A in public or private property to get access from all callbacks. But when I write:

properties (Access = public)
        Property % Description
        A = app.Spinner1.Value;

I get this Error:

Invalid default value for property 'A' in class 'Example':

Unable to resolve the name app.Spinner1.Value.

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Answer 1

Mario Malic 2021-5-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/838128-how-to-assign-the-value-of-an-ui-control-element-to-a-variable-in-public-property-in-app-designer#answer_707638

编辑：Mario Malic 2021-5-24

Hey,

The public access to the property or the method means that if you start your app from the outside, from the Command Window like this, you will be able to get property named "Property" as defined in that block.

app = NameOfApp;
app.Property % ask what's inside Property

So, what you need is to reference the property of the app correctly.

properties (Access = public)
    Property % Description
    A
end

Notice, that your app has now property A, and you index into it like this

app.A

So, you can assign a value to property like this

% Button pushed function: StartButton
    function StartButtonPushed(app, event)
        app.A = app.Spinner1.Value;
    end

That should be it, before asking for similar questions, take a look at tutorials here and introductory apps in the App Designer, and there are plenty of questions in MATLAB Answers.