Why is uilistbox Multiselect property being ignored inconsistently?

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Geoff 2016-4-20

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https://ww2.mathworks.cn/matlabcentral/answers/279943-why-is-uilistbox-multiselect-property-being-ignored-inconsistently

评论： Greg 2017-1-23

I am using the new App Designer in 2016a and have created a uilistbox. The Multiselect property is set to 'on'. When running with a debug flag set multi-selection works, when running normally multi-selection does not work. What is driving this behavior? Are there any workarounds or solutions?

Auto generated code that creates the list box:

app.DaysimeterList = uilistbox(app.HomeTab);
app.DaysimeterList.Items = {'proto 1', 'proto 2'};
app.DaysimeterList.Multiselect = 'on';
app.DaysimeterList.ValueChangedFcn = createCallbackFcn(app, @DaysimeterListValueChanged);
app.DaysimeterList.Position = [526 83 100 299];
app.DaysimeterList.Value = {'proto 1'};

Code that updates the list and is supposed to select all items:

function results = refreshDaysimeterList(app)
  daysimeterPaths = app.getDaysimeters;
  deviceSns = cellfun(@app.getDeviceSn,daysimeterPaths,'UniformOutput',false);
  app.DaysimeterList.Items = deviceSns';
  app.DaysimeterList.ItemsData = daysimeterPaths';
    if isempty(daysimeterPaths)
      app.DaysimeterList.Enable = 'off';
      app.DaysimeterList.Items = {'None'; 'detected'};
    else
      app.DaysimeterList.Enable = 'on';
      app.DaysimeterList.Value = app.DaysimeterList.ItemsData(:); % Select all Daysimeters
    end
  end

The update function is called during the App startup:

% Code that executes after component creation
function startupFcn(app)
  app.loadPreferences; % Load the App preferences
  app.refreshDaysimeterList; % Refresh the Daysimeter list
end

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Meade 2016-4-21

在 MATLAB Online 中打开

The "Value" method is usually indices, but you're trying to assign it whatever format "ItemsData" is in.

Try changing the last line in your refreshDaysimeterList fnc.

app.DaysimeterList.Value = 1:numel(app.DaysimeterList.ItemsData); % Select all Daysimeters

Does this change your result?

Greg 2017-1-23

The comment by Meade is completely off the mark. AppDesigner documentation clearly states that the 'Value' property is a value of the 'ItemsData' property, or of 'Items' if 'ItemsData' is empty.

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