This was a simple app I wrote a few days ago which updates the items in a drop down based on the value of a slider. Other properties of the drop down, such as 'ItemsData' and 'ValueChangedFcn', can be updated in a similar manner. Are you looking for something like this?
classdef app1 < matlab.apps.AppBase
% Properties that correspond to app components
properties (Access = public)
UIFigure matlab.ui.Figure
DropDownLabel matlab.ui.control.Label
DropDown matlab.ui.control.DropDown
SliderLabel matlab.ui.control.Label
Slider matlab.ui.control.Slider
end
% Callbacks that handle component events
methods (Access = private)
% Value changed function: Slider
function SliderValueChanged(app, event)
value = app.Slider.Value;
app.DropDown.Items = compose('Option %d', 1:(floor(value/20)+1));
end
end
% Component initialization
methods (Access = private)
% Create UIFigure and components
function createComponents(app)
% Create UIFigure and hide until all components are created
app.UIFigure = uifigure('Visible', 'off');
app.UIFigure.Position = [100 100 640 480];
app.UIFigure.Name = 'UI Figure';
% Create DropDownLabel
app.DropDownLabel = uilabel(app.UIFigure);
app.DropDownLabel.HorizontalAlignment = 'right';
app.DropDownLabel.Position = [68 319 66 22];
app.DropDownLabel.Text = 'Drop Down';
% Create DropDown
app.DropDown = uidropdown(app.UIFigure);
app.DropDown.Items = {'Option 1'};
app.DropDown.Position = [149 319 100 22];
% Create SliderLabel
app.SliderLabel = uilabel(app.UIFigure);
app.SliderLabel.HorizontalAlignment = 'right';
app.SliderLabel.Position = [322 330 36 22];
app.SliderLabel.Text = 'Slider';
% Create Slider
app.Slider = uislider(app.UIFigure);
app.Slider.ValueChangedFcn = createCallbackFcn(app, @SliderValueChanged, true);
app.Slider.Position = [379 339 150 3];
% Show the figure after all components are created
app.UIFigure.Visible = 'on';
end
end
% App creation and deletion
methods (Access = public)
% Construct app
function app = app1
% Create UIFigure and components
createComponents(app)
% Register the app with App Designer
registerApp(app, app.UIFigure)
if nargout == 0
clear app
end
end
% Code that executes before app deletion
function delete(app)
% Delete UIFigure when app is deleted
delete(app.UIFigure)
end
end
end
