MATLAB App-在创建组件之前添加路径 [英] MATLAB App - Add path before component creation

问题描述

我在某个文件夹~/myapp/中有一个MATLAB App App.mlapp .它使用的功能以及GUI中使用的某些图形在~/myapp/subfolder中.为了正确运行 App.mlapp ，我每次必须在启动应用之前将~/myapp/subfolder手动添加到我的路径中.

如何自动添加子文件夹?

我尝试将addpath(genpath(~/myapp/subfolder));放在StartupFcn的开头.但是，由于StartupFcn是在创建组件后调用的，而该组件已经需要~/myapp/subfolder中的某些图形，因此此方法不起作用.组件是使用自动创建的功能createComponents创建的，无法使用App Designer编辑器进行编辑.

最小的示例，按excaza的要求.要创建它，请打开应用设计器"，创建一个新应用，在设计视图"中添加一个按钮，并使用 Button Properties-> Text&在路径中指定一个图标.图标->更多属性->图标文件.然后从路径中删除图标的目录，然后尝试运行该应用程序.

classdef app1 < matlab.apps.AppBase

    % Properties that correspond to app components
    properties (Access = public)
        UIFigure  matlab.ui.Figure
        Button    matlab.ui.control.Button
    end

    % App initialization and construction
    methods (Access = private)

        % Create UIFigure and components
        function createComponents(app)

            % Create UIFigure
            app.UIFigure = uifigure;
            app.UIFigure.Position = [100 100 640 480];
            app.UIFigure.Name = 'UI Figure';

            % Create Button
            app.Button = uibutton(app.UIFigure, 'push');
            app.Button.Icon = 'help_icon.png';
            app.Button.Position = [230 321 100 22];
        end
    end

    methods (Access = public)

        % Construct app
        function app = app1

            % Create and configure components
            createComponents(app)

            % Register the app with App Designer
            registerApp(app, app.UIFigure)

            if nargout == 0
                clear app
            end
        end

        % Code that executes before app deletion
        function delete(app)

            % Delete UIFigure when app is deleted
            delete(app.UIFigure)
        end
    end
end

解决方案

虽然我了解MATLAB在appdesigner中进行设计时决定锁定许多GUI代码的决定，但我也一直在向他们大声疾呼它们的潜力像这样的重大缺点.

除了肥皂盒之外，您还可以利用MATLAB的类属性规范来解决此问题行为，它将在执行其余类的代码之前将属性初始化为其默认属性.

在这种情况下，我们可以添加一个虚拟私有变量并将其设置为 解决方案

While I understand MATLAB's decision to lock away a lot of the GUI's code when designing in appdesigner, I've also been fairly vocal to them about the potential significant downsides, like this one.

Soapbox aside, you can get around this by exploiting MATLAB's class property specification behavior, which initializes properties to their default properties before the rest of the class' code is executed.

In this case, we can add a dummy private variable and set it to the output of addpath:

properties (Access = private)
    oldpath = addpath('./icons')
end

Which provides the desired behavior when passed the appropriate path.

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