App designer, making components visible

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MIchael Brennan
MIchael Brennan 2020-5-5
评论： Image Analyst 2020-5-5
im having trouble turning on and off visiblity of a dropdown component and a button component
This error has come up for "switch expression must be a scalar or a character vector
app.SelectfeildDropDown.ValueChangedFcn
app.SelectfeildDropDown.Items
for
app.SelectfeildDropDown.Value
nothing happens we i change the value on the GUI
% Callbacks that handle component events
methods (Access = private)
% Value changed function: SelectfeildDropDown
function SelectfeildDropDownValueChanged(app, event)
switch(app.SelectfeildDropDown.DropDown.value)
case 'select'
case 'Tempreture'
app.MetrictoImperialButton.Visible
app.DropDown.Visible
case 'Length'
app.MetrictoImperialButton.Visible
app.DropDown.Visible
case 'Mass'
app.MetrictoImperialButton.Visible
app.DropDown.Visible
end
end
end

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采纳的回答

Image Analyst
Image Analyst 2020-5-5
编辑：Image Analyst 2020-5-5
You can't switch on the function name. You have to switch on the "Value" property, not the callback function's name, like:
switch app.SelectfeildDropDown.Value
Check spelling -- did you mean field instead of feild?
Then, I think you need to actually set the Visible property to something to show or hide it. So do something like
app.DropDown.Visible = 1; % 1 to show. 0 to hide.
Or maybe they use 'on' and 'off' instead of 1 and 0. They are inconsistent about that (at least in GUIDE they were). So if 1 and 0 don't work, try 'on' and 'off'
  2 个评论
MIchael Brennan
MIchael Brennan 2020-5-5
Thanks I managed to work it out, it was supposed to be switch app.SelectionfeildDropDown.Value
But i also needed to toggle the visibility on and off
Image Analyst
Image Analyst 2020-5-5
I guess I must have been posting that same solution at the very same time you were figuring it out on your own. But glad it's fixed.

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更多回答（1 个）

MIchael Brennan
MIchael Brennan 2020-5-5
This is what i wanted

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