Two while or for loop in app designer.

Hi

I am looking for a way for cancle running loop when a button cliked.

For a example there is a code below.

When I clicked the button1 then cliked the button2, something works2 is on going.

But something works2 is returned, the something works1 is on going.

When button 1 is clicked and button 2 is clicked, I want something works1 to stop and something works2 to start.

How can I do this?

function button1Clicked(app, event)
    while(1)
        %something works1
        if ?
            return;
        end
    end
end

function button2Clicked(app, event)
    while(1)
        %something works2
        if ?
            return;
        end
    end
end

[dpb]

You'll need a global status variable for each process that notes if it is/isn't running. Check its status on the button callbacks and take the appropriate action.

[Geoff Hayes]

@Jae-Hee Park - or consider using a a timer to perform the repeated actions (instead of a loop) then just stop the timer when the appropriate button is pushed.

Answer 1

[Sai Teja G]

Hi Jae-Hee,

I understand that you want to use both the buttons as per your requirements.

To achieve the desired functionality in App Designer code, you can use callbacks and a flag variable to control the running loop. Here's an example of how you can implement it:

classdef MyApp < matlab.apps.AppBase 
    
    % Properties 
    properties (Access = private) 
        RunningFlag = false; % Flag to control the running loop 
    end 
    
    % Callbacks 
    methods (Access = private) 
        
        % Button1 callback 
        function Button1Pushed(app, ~) 
            % Stop "something works1" if it is running 
            if app.RunningFlag 
                app.RunningFlag = false; 
            end 
            % Start "something works2" 
            app.something_works2(); 
        end 
        
        % Button2 callback 
        function Button2Pushed(app, ~) 
            % Stop "something works1" if it is running 
            if app.RunningFlag 
                app.RunningFlag = false; 
            end 
            % Start "something works2" 
            app.something_works2(); 
        end 
        
        % Function for "something works1" 
        function something_works1(app) 
            app.RunningFlag = true; 
            while app.RunningFlag 
                % Code for "something works1" goes here 
                disp("Something works1 is ongoing...") 
            end 
        end 
        
        % Function for "something works2" 
        function something_works2(app) 
            % Code for "something works2" goes here 
            disp("Something works2 is ongoing...") 
        end 
    end 
    
    % App creation and deletion 
    methods (Access = private) 
        
        % Create UIFigure and components 
        function createComponents(app) 
            % Create UIFigure and other components here 
            % ... 
            
            % Create Button1 
            app.Button1 = uibutton(app.UIFigure, 'push'); 
            app.Button1.ButtonPushedFcn = createCallbackFcn(app, @Button1Pushed, true); 
            
            % Create Button2 
            app.Button2 = uibutton(app.UIFigure, 'push'); 
            app.Button2.ButtonPushedFcn = createCallbackFcn(app, @Button2Pushed, true); 
            
            % ... 
        end 
    end 
end 

In this example, we have an AppDesigner app with two buttons, Button1 and Button2. When either button is clicked, the corresponding callback function (Button1Pushed or Button2Pushed) is executed. Inside each callback, we check if ‘something_works1’ is running (app.RunningFlag is true) and stop it by setting app.RunningFlag to false. Then, we proceed to start 'something_works2' by calling the ‘something_works2’ method.

The ‘something_works1’ method represents the loop for "something works1" and is controlled by the app.RunningFlag variable. When app.RunningFlag is true, the loop continues, and when it is false, the loop stops.

Hope this resolves your query!