MATLAB: If I change a property of a UIControl in a callback do I still need to call setappdata before exiting

Question

I start my call back with

handles = getappdata(gcf,'handles');

So I have created a local copy of the handles structure.

Then I modify a control with

set(handles.Batch,'value',1);

Since handles.batch is a handle, don't I automatically change its properties without having to call

setappdata(gcf,'handles',handles);

Answer 1

Correct, you only have to call setappdata() if you modify the structure itself.

Note: it is more common to use guidata() to manage a handles structure. It does the same thing as setappdata() of a property named UsedByGUIData_m, but people are more accustomed to reading guidata()