2020-02-27 MATLAB App Designer——

官方帮助

1 访问和更新回调中的 UI 组件内的数据

app.Component.Property

2 获取并设置一个仪表的 Value 属性

x = app.PressureGauge.Value; % Get the gauge value
app.PressureGauge.Value = 50; % Set the gauge value to 50

3 共享某个中间结果或多个回调需要访问的数据

• 应定义公共或私有属性来存储数据
  公共属性在 App 内部和外部均可访问，而私有属性只能在 App 内部访问。
• 描述该属性

properties (Access = public)
        X % Average cost
end

• 代码需要在 App 启动时访问某个属性值
  在 properties 块或在 StartupFcn 回调中对其值进行初始化

% 初始化
properties (Access = public)
        X = 5; % Average cost
end
% 在代码的其他位置，使用圆点表示法获取或设置属性的值
y = app.X  % Get the value of X
app.X = 5; % Set the value of X

public，protected，private权限

Access=private：表示只有该类的成员方法可以访问该数据，而子类和其他外部函数无法访问该成员变量。
Access=protected：表示只有该类的成员方法还有该类的子类而已访问该数据。
public：在类的定义中、类的成员方法、子类的成员是方法都可以访问这个成员变量，类之外的函数或者脚本也可以访问这个成员变量。
作者：hainingwyx
链接：https://www.jianshu.com/p/87d5d0634a2d

5 官方示例

共享绘图数据和下拉列表选择

classdef ConfigurePlotAppExample < matlab.apps.AppBase

    % 对应于应用程序组件的属性
    properties (Access = public)
        ConfigurePlotUIFigure     matlab.ui.Figure
        UIAxes                    matlab.ui.control.UIAxes
        SampleSizeEditFieldLabel  matlab.ui.control.Label
        SampleSizeEditField       matlab.ui.control.NumericEditField
        ColormapDropDownLabel     matlab.ui.control.Label
        ColormapDropDown          matlab.ui.control.DropDown
        UpdatePlotButton          matlab.ui.control.Button
    end

%% 共享数据传递 %%%%%%%%%%
    properties (Access = private)     
        Z = peaks(35);   % 要绘制的曲面数据
    end
%%%%%%%%%%%%%%%%%%%%
    methods (Access = private)
    
        function plotsurface(app)
            % Plot Z
            surf(app.UIAxes,app.Z);
            
            % 设置颜色映射
            cmap = app.ColormapDropDown.Value;
            colormap(app.UIAxes,cmap);    
        end
        
    end


    methods (Access = private)

        % 组件创建后执行的代码
        function startupFcn(app)
            plotsurface(app);
        end

        % 按钮按下功能：UpdatePlotButton
        function UpdatePlotButtonPushed(app, event)
            plotsurface(app);
        end

        % 值更改函数：SampleSizeEditField
        function SampleSizeEditFieldValueChanged(app, event)
            sampleSize = app.SampleSizeEditField.Value;
            
            % Update the Z property
            app.Z = peaks(sampleSize);
        end
    end

    % 应用程序初始化和构造
    methods (Access = private)

        % Create UIFigure and components
        function createComponents(app)

            % Create ConfigurePlotUIFigure
            app.ConfigurePlotUIFigure = uifigure;
            app.ConfigurePlotUIFigure.Position = [100 100 495 365];
            app.ConfigurePlotUIFigure.Name = 'Configure Plot';

            % Create UIAxes
            app.UIAxes = uiaxes(app.ConfigurePlotUIFigure);
            app.UIAxes.Position = [150 32 323 287];

            % Create SampleSizeEditFieldLabel
            app.SampleSizeEditFieldLabel = uilabel(app.ConfigurePlotUIFigure);
            app.SampleSizeEditFieldLabel.HorizontalAlignment = 'right';
            app.SampleSizeEditFieldLabel.VerticalAlignment = 'top';
            app.SampleSizeEditFieldLabel.Position = [37 257 74 15];
            app.SampleSizeEditFieldLabel.Text = 'Sample Size';

            % Create SampleSizeEditField
            app.SampleSizeEditField = uieditfield(app.ConfigurePlotUIFigure, 'numeric');
            app.SampleSizeEditField.Limits = [2 1000];
            app.SampleSizeEditField.ValueChangedFcn = createCallbackFcn(app, @SampleSizeEditFieldValueChanged, true);
            app.SampleSizeEditField.Position = [24 230 100 22];
            app.SampleSizeEditField.Value = 35;

            % Create ColormapDropDownLabel
            app.ColormapDropDownLabel = uilabel(app.ConfigurePlotUIFigure);
            app.ColormapDropDownLabel.HorizontalAlignment = 'right';
            app.ColormapDropDownLabel.VerticalAlignment = 'top';
            app.ColormapDropDownLabel.Position = [44 202 59 15];
            app.ColormapDropDownLabel.Text = 'Colormap';

            % Create ColormapDropDown
            app.ColormapDropDown = uidropdown(app.ConfigurePlotUIFigure);
            app.ColormapDropDown.Items = {'Parula', 'Jet', 'Winter', 'Cool'};
            app.ColormapDropDown.Position = [24 175 100 22];
            app.ColormapDropDown.Value = 'Parula';

            % Create UpdatePlotButton
            app.UpdatePlotButton = uibutton(app.ConfigurePlotUIFigure, 'push');
            app.UpdatePlotButton.ButtonPushedFcn = createCallbackFcn(app, @UpdatePlotButtonPushed, true);
            app.UpdatePlotButton.Position = [24 122 100 22];
            app.UpdatePlotButton.Text = 'Update Plot';
        end
    end

    methods (Access = public)

        % 构建应用程序
        function app = ConfigurePlotAppExample

            % Create and configure components
            createComponents(app)

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

            % Execute the startup function
            runStartupFcn(app, @startupFcn)

            if nargout == 0
                clear app
            end
        end

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

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

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