Creating empty ui control component

2020 12 22
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回答已采纳
更新时间：2020 12 22
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When using appdesigner, I want to initialize a property as an array of labels and text area
properties (Access = private)
comp_ui_obj
end
function startupFcn(app)
app.comp_ui_obj(1) = app.CompLabel;
% 2..n assignments here
end
The problem is that the declaration of comp_ui_obj is by default double. Because of this app.comp_ui_obj(1) will contain a double instead of a matlab.ui.control object.
So, it seems that app.comp_ui_obj needs to be initialized as an empty matlab.ui.control object before the assignment.
With some classes, the empty function can be used for this (ex: uint8.empty). However, matlab.ui.control.empty does not work.
So, how do we initialize an empty ui control in appdesigner? How do we initialize a vector of empty elements?

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Cris LaPierre
Cris LaPierre 2020-12-22
Could you provide more detail on why you are wanting to do this? What is the need driving this workflow?

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 采纳的回答

Cris LaPierre
Cris LaPierre 2020-12-22

1 个投票

Try setting your property to an empty Label class using the following
comp_ui_obj = matlab.ui.control.Label.empty

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Bruno Pilon
Bruno Pilon 2020-12-22
This is exactly what I was looking for. I was missing the capital L of Label. Thank you!

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Bruno Pilon
Bruno Pilon 2020-12-22

0 个投票

I found one way to initialize the ui control variable:
dummy_obj = uilabel(app.UIFigure);
app.comp_ui_obj = repelem(dummy_obj,nb_of_objects);
Then, the assignments work as app.comp_ui_obj already contains ui objects.

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