app designer switch problem

Hello community!
I want to use a switch to control the UI theme, like light mode and dark mode. But I can only switch it once, the second time I click, no response. Here are the codes:
% Value changed function: Switch2
function Switch2ValueChanged(app, event)
value = app.Switch2.Value;
if value
app.UIFigure.Color = [0.5, 0.5, 0.5];
else
app.UIFigure.Color = [1, 1, 1];
end
end
related photos, before I click:
after I click:
However, it can only work once. Can you help me, please?

 采纳的回答

Items property of app.Switch2 is 'On' and 'Off' in this app, so you need to change the if condition to value == "On".
function Switch2ValueChanged(app, event)
value = app.Switch2.Value;
if value == "On"
app.UIFigure.Color = [0.5, 0.5, 0.5];
else
app.UIFigure.Color = [1, 1, 1];
end
end

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