how to close an UIFigure from a second app

Hello !

Using app designer, I've created an application (app1) which, when I press a button (button1), opens a second application (app2). In app1, I also have a second button (button2) which, when pressed, opens a third app (app3). In app3, I have a button which, when pressed, executes a code and when it's finished, I'd like the code to close not only app3 but also app2. I've managed to close app3, but my problem is with closing app2.

In app1 and app3, I declared the app2 handle (app2handle) as a public property. However, in app3, when I use the line:

delete(app.app2handle);

app2 doesn't close.

The same line of code in app1, closes app2.

How can I do this?

Answer 1

[Ruchika Parag]

Hi GMabilleau, to close app2 from app3, you need to ensure that the handle to app2 is correctly passed and accessible within app3. Here is an example explaining how to do this :

In app1, declare a public property to store the handle of app2. When you create app3 from app1, pass the handle of app2 to app3:

classdef app1 < matlab.apps.AppBase

    properties (Access = public)
        UIFigure  matlab.ui.Figure
        Button1   matlab.ui.control.Button
        Button2   matlab.ui.control.Button
        app2handle
    end

    methods (Access = private)

        % Button pushed function: Button1
        function Button1Pushed(app, event)
            app.app2handle = app2;
        end

        % Button pushed function: Button2
        function Button2Pushed(app, event)
            app3handle = app3;
            app3handle.app2handle = app.app2handle;
        end
    end

    % Component initialization
    methods (Access = private)

        % Create UIFigure and components
        function createComponents(app)

            % Create UIFigure
            app.UIFigure = uifigure;
            app.UIFigure.Position = [100 100 400 300];
            app.UIFigure.Name = 'UI Figure';

            % Create Button1
            app.Button1 = uibutton(app.UIFigure, 'push');
            app.Button1.Position = [100 200 100 22];
            app.Button1.Text = 'Open App2';
            app.Button1.ButtonPushedFcn = createCallbackFcn(app, @Button1Pushed, true);

            % Create Button2
            app.Button2 = uibutton(app.UIFigure, 'push');
            app.Button2.Position = [100 150 100 22];
            app.Button2.Text = 'Open App3';
            app.Button2.ButtonPushedFcn = createCallbackFcn(app, @Button2Pushed, true);
        end
    end

    % App initialization and construction
    methods (Access = public)

        % Construct app
        function app = app1

            % Create and configure components
            createComponents(app)
        end
    end
end

In the button callback of app3, where you want to close both app3 and app2, use the handle to app2 that was passed from app1:

classdef app3 < matlab.apps.AppBase

    properties (Access = public)
        UIFigure  matlab.ui.Figure
        Button    matlab.ui.control.Button
        app2handle
    end

    methods (Access = private)

        % Button pushed function: Button
        function ButtonPushed(app, event)
            % Your code execution here

            % Close app2
            if isvalid(app.app2handle) % Check if app2 is still valid
                delete(app.app2handle);
            end

            % Close app3
            delete(app);
        end
    end

    % Component initialization
    methods (Access = private)

        % Create UIFigure and components
        function createComponents(app)

            % Create UIFigure
            app.UIFigure = uifigure;
            app.UIFigure.Position = [100 100 400 300];
            app.UIFigure.Name = 'UI Figure';

            % Create Button
            app.Button = uibutton(app.UIFigure, 'push');
            app.Button.Position = [150 150 100 22];
            app.Button.Text = 'Execute and Close';
            app.Button.ButtonPushedFcn = createCallbackFcn(app, @ButtonPushed, true);
        end
    end

    % App initialization and construction
    methods (Access = public)

        % Construct app
        function app = app3

            % Create and configure components
            createComponents(app)
        end
    end
end

Hope this helps!

[GMabilleau]

Many thanks Ruchika Parag. It works as I wanted. I forgot to pass the handle from app1.

Cheers

GMabilleau