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Generating an unknown ammount of Buttons in App Designer

Ahmet Sahin さんによって質問されました 2019 年 8 月 26 日
最新アクティビティ Ahmet Sahin さんによって コメントされました 2019 年 8 月 26 日
Hello,
I'm trying to generate Buttons programmatically with the App Designer.
I have an Excel File, where all the names of the Buttons are listet, not knowing how many Buttons (or lines in Excel) will be needed.
I figured out how to create components with the App Designer programmtically:
So I tried many things, but none of them worked.
The problem is, that (as far as I understood) every Button (or other element) in the GUI needs his own variable. So I have to create new variables with the function eval, wich is, how I found out on every site here, absoulutly forbidden...
My first thought was to create an Array, but it didn't work:
Unable to perform assignment because dot indexing is not supported for variables of this type.
And heres the Code:
A = [378 700 100 22]; %Position of the Button
allKeys = string(keys(CellContOne)); %allKeys gets all the Buttonnames as a String
UniButton = zeros(length(allKeys)); %An Array with the length of the List is created
for i = 1:length(allKeys) %For Loop to create the Buttons
UniButton(i) = uibutton(app.UIFigure, 'state'); %Creating a Button
UniButton(i).Position = A; %Giving the Button a position
UniButton(i).Text = allKeys(i); %Giving the Button it's Text
b_text = UniButton(i).Text; %global Variable gets the Text
b_value = UniButton(i).Value; %global Variable gets the Value
UniButton(i).ValueChangedFcn = @app.mybuttonpress; %Callback function
A(2) = A(2) -25; %Position change for the next Button
end
I also tried using just one variable for every Button, but it didn't work because the GUI wasn't able to figure out wich button was pressed (I need this information for the callback) The code looks the same, just without the index (i) and the line UniButton = zeros(length(allKeys));
Structures and Cell Arrays also didn't work for me.
I hope You can help me!

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2 件の回答

xi
回答者: xi
2019 年 8 月 26 日
 採用された回答

You need to remove the line:
UniButton = zeros(length(allKeys));
In the callback function, you can retreive source.Text to determine which button is pressed and source.Value to determine the state of the pressed button:
function mybuttonpress(app,source,event)
source.Value
source.Text
end

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Ahmet Sahin 2019 年 8 月 26 日
Hi Xi,
thank You for Your help. I also didn't know about the source.___ thing, that also really helped me out.
Thank You!

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Dennis
回答者: Dennis
2019 年 8 月 26 日

Hi,
your code should almost work, you need to remove the preallocation with zeros. You can let your loop run backwards instead:
A = [378 700 100 22]; %Position of the Button
allKeys = string(keys(CellContOne)); %allKeys gets all the Buttonnames as a String
for i = length(allKeys):-1:1 %For Loop to create the Buttons
UniButton(i) = uibutton(app.UIFigure, 'state'); %Creating a Button
UniButton(i).Position = A; %Giving the Button a position
UniButton(i).Text = allKeys(i); %Giving the Button it's Text
b_text = UniButton(i).Text; %global Variable gets the Text
b_value = UniButton(i).Value; %global Variable gets the Value
UniButton(i).ValueChangedFcn = @app.mybuttonpress; %Callback function
A(2) = A(2) -25; %Position change for the next Button
end

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Ahmet Sahin 2019 年 8 月 26 日
Hi Dennis,
thank you very much, now everything works fine!

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