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"Unrecognized method, property, or field 'Type' for class 'matlab.ui​.control.W​ebComponen​t'."

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In App Designer (MATLAB R2024a, Windows 10 Pro, 64-bit) I have a tab (app.tabFiles) that has a few ui components on it. When I query the Type property on all of them at once, I get the following error:
tf = strcmp({app.tabFiles.Children.Type}, 'uistatebutton') ; % This works fine with 7 other tabs, panels, etc
"Unrecognized method, property, or field 'Type' for class 'matlab.ui.control.WebComponent'."
However, if I query the Type of the components individually, each happily returns its Type. Huh?
I should mention, there are 13 components visible on the tab and 13 listed in the Component Browser. However, the tab has 14 Children - the extra child is the label (set to empty string) on a uieditfield component - but all respond as expected to the individual Type request.
Any idea what would cause that exception to be thrown? And how to avoid it?

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Fangjun Jiang
Fangjun Jiang 2024 年 4 月 14 日
編集済み: Fangjun Jiang 2024 年 4 月 14 日
I think app.tabFiles.Children is an array of handles. Try tf = strcmp(get(app.tabFiles.Children,'Type'), 'uistatebutton')
  2 件のコメント
Dave Watson
Dave Watson 2024 年 4 月 16 日
Yes, thank you, that works. However, it should be equivalent to what I did and my approach works on other UI components with Children, with that one exception. Mysteries of MATLAB! Thanks, again.
Fangjun Jiang
Fangjun Jiang 2024 年 4 月 16 日
close all;plot(1:3);
obj=findobj(0)
obj =
4x1 graphics array: Root Figure (1) Axes Line
obj(1).Type
ans = 'root'
get(obj,'Type')
ans = 4x1 cell array
{'root' } {'figure'} {'axes' } {'line' }
obj.Type
Unrecognized method, property, or field 'Type' for class 'matlab.graphics.Graphics'.

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