通过创建辅助函数，您可以使常用命令具有单一源代码，避免维护冗余代码。

私有函数通常在单窗口 App 中使用，而公共函数通常在多窗口 App 中使用。

1 创建辅助函数

点击编辑器选项卡中函数按钮的向下箭头展开下拉菜单

选择代码浏览器中的函数选项卡，选择私有函数或公共函数。

管理辅助函数

更改辅助函数名称时，App 设计工具会自动更新对该函数的所有引用。

官方示例

用于初始化绘图和显示更新后数据的辅助函数

set_param % 设置系统和模块参数值

classdef sf_mediaplayer_strings_ui < matlab.apps.AppBase

% 对应于应用程序组件的属性

properties (Access = public)

UIFigure matlab.ui.Figure

AlbumNameEditFieldLabel matlab.ui.control.Label

AlbumNameEditField matlab.ui.control.EditField

RadioRequestPanel matlab.ui.container.Panel

OFFButton matlab.ui.control.Button

AMButton matlab.ui.control.Button

FMButton matlab.ui.control.Button

CDButton matlab.ui.control.Button

CDRequestPanel matlab.ui.container.Panel

STOPButton matlab.ui.control.Button

PLAYButton matlab.ui.control.Button

REWButton matlab.ui.control.Button

FFButton matlab.ui.control.Button

MediaPlayerHelperLabel matlab.ui.control.Label

InsertDiscButton matlab.ui.control.Button

EjectDiscButton matlab.ui.control.Button

end

methods (Access = private)

% 值更改函数：AlbumNameEditField

function AlbumNameEditFieldValueChanged(app, event)

set_param('sf_mediaplayer_strings/Album','String','"'+string(app.AlbumNameEditField.Value)+'"');

set_param('sf_mediaplayer_strings/ID','Value','0');

set_param('sf_mediaplayer_strings/ED','Value','0');

end

% 按钮按下功能：关闭按钮

function OFFButtonPushed(app, event)

set_param('sf_mediaplayer_strings/RR','String','"OFF"');

set_param('sf_mediaplayer_strings/ID','Value','0');

set_param('sf_mediaplayer_strings/ED','Value','0');

end

% Button pushed function: AMButton

function AMButtonPushed(app, event)

set_param('sf_mediaplayer_strings/RR','String','"AM"');

set_param('sf_mediaplayer_strings/ID','Value','0');

set_param('sf_mediaplayer_strings/ED','Value','0');

end

% Button pushed function: FMButton

function FMButtonPushed(app, event)

set_param('sf_mediaplayer_strings/RR','String','"FM"');

set_param('sf_mediaplayer_strings/ID','Value','0');

set_param('sf_mediaplayer_strings/ED','Value','0');

end

% Button pushed function: CDButton

function CDButtonPushed(app, event)

set_param('sf_mediaplayer_strings/RR','String','"CD"');

set_param('sf_mediaplayer_strings/ID','Value','0');

set_param('sf_mediaplayer_strings/ED','Value','0');

end

% Button pushed function: STOPButton

function STOPButtonPushed(app, event)

set_param('sf_mediaplayer_strings/CR','String','"STOP"');

set_param('sf_mediaplayer_strings/ID','Value','0');

set_param('sf_mediaplayer_strings/ED','Value','0');

end

% Button pushed function: PLAYButton

function PLAYButtonPushed(app, event)

set_param('sf_mediaplayer_strings/CR','String','"PLAY"');

set_param('sf_mediaplayer_strings/ID','Value','0');

set_param('sf_mediaplayer_strings/ED','Value','0');

end

% Button pushed function: REWButton

function REWButtonPushed(app, event)

set_param('sf_mediaplayer_strings/CR','String','"REW"');

set_param('sf_mediaplayer_strings/ID','Value','0');

set_param('sf_mediaplayer_strings/ED','Value','0');

end

% Button pushed function: FFButton

function FFButtonPushed(app, event)

set_param('sf_mediaplayer_strings/CR','String','"FF"');

set_param('sf_mediaplayer_strings/ID','Value','0');

set_param('sf_mediaplayer_strings/ED','Value','0');

end

% Button pushed function: InsertDiscButton

function InsertDiscButtonPushed(app, event)

set_param('sf_mediaplayer_strings/ID','Value','1');

set_param('sf_mediaplayer_strings/ED','Value','0');

end

% Button pushed function: EjectDiscButton

function EjectDiscButtonPushed(app, event)

set_param('sf_mediaplayer_strings/ID','Value','0');

set_param('sf_mediaplayer_strings/ED','Value','1');

end

% Close request function: UIFigure

function UIFigureCloseRequest(app, event)

set_param('sf_mediaplayer_strings/SS','Value','1');

delete(app);

end

end

% App initialization and construction

methods (Access = private)

% Create UIFigure and components

function createComponents(app)

% Create UIFigure

app.UIFigure = uifigure;

app.UIFigure.Position = [100 100 639 439];

app.UIFigure.Name = 'UI Figure';

app.UIFigure.CloseRequestFcn = createCallbackFcn(app, @UIFigureCloseRequest, true);

% Create AlbumNameEditFieldLabel

app.AlbumNameEditFieldLabel = uilabel(app.UIFigure);

app.AlbumNameEditFieldLabel.HorizontalAlignment = 'right';

app.AlbumNameEditFieldLabel.VerticalAlignment = 'top';

app.AlbumNameEditFieldLabel.Position = [66 321 76 15];

app.AlbumNameEditFieldLabel.Text = 'Album Name';

% Create AlbumNameEditField

app.AlbumNameEditField = uieditfield(app.UIFigure, 'text');

app.AlbumNameEditField.ValueChangedFcn = createCallbackFcn(app, @AlbumNameEditFieldValueChanged, true);

app.AlbumNameEditField.HorizontalAlignment = 'center';

app.AlbumNameEditField.Position = [157 317 418 22];

app.AlbumNameEditField.Value = 'Handel''s Greatest Hits';

% Create RadioRequestPanel

app.RadioRequestPanel = uipanel(app.UIFigure);

app.RadioRequestPanel.Title = 'Radio Request';

app.RadioRequestPanel.Position = [66 147 509 79];

% Create OFFButton

app.OFFButton = uibutton(app.RadioRequestPanel, 'push');

app.OFFButton.ButtonPushedFcn = createCallbackFcn(app, @OFFButtonPushed, true);

app.OFFButton.Position = [46 13 69 28];

app.OFFButton.Text = 'OFF';

% Create AMButton

app.AMButton = uibutton(app.RadioRequestPanel, 'push');

app.AMButton.ButtonPushedFcn = createCallbackFcn(app, @AMButtonPushed, true);

app.AMButton.Position = [213 13 69 28];

app.AMButton.Text = 'AM';

% Create FMButton

app.FMButton = uibutton(app.RadioRequestPanel, 'push');

app.FMButton.ButtonPushedFcn = createCallbackFcn(app, @FMButtonPushed, true);

app.FMButton.Position = [304 13 69 28];

app.FMButton.Text = 'FM';

% Create CDButton

app.CDButton = uibutton(app.RadioRequestPanel, 'push');

app.CDButton.ButtonPushedFcn = createCallbackFcn(app, @CDButtonPushed, true);

app.CDButton.Position = [396 13 69 28];

app.CDButton.Text = 'CD';

% Create CDRequestPanel

app.CDRequestPanel = uipanel(app.UIFigure);

app.CDRequestPanel.Title = 'CD Request';

app.CDRequestPanel.Position = [67 38 509 79];

% Create STOPButton

app.STOPButton = uibutton(app.CDRequestPanel, 'push');

app.STOPButton.ButtonPushedFcn = createCallbackFcn(app, @STOPButtonPushed, true);

app.STOPButton.Position = [46 10 69 28];

app.STOPButton.Text = 'STOP';

% Create PLAYButton

app.PLAYButton = uibutton(app.CDRequestPanel, 'push');

app.PLAYButton.ButtonPushedFcn = createCallbackFcn(app, @PLAYButtonPushed, true);

app.PLAYButton.Position = [213 10 69 28];

app.PLAYButton.Text = 'PLAY';

% Create REWButton

app.REWButton = uibutton(app.CDRequestPanel, 'push');

app.REWButton.ButtonPushedFcn = createCallbackFcn(app, @REWButtonPushed, true);

app.REWButton.Position = [303 10 69 28];

app.REWButton.Text = 'REW';

% Create FFButton

app.FFButton = uibutton(app.CDRequestPanel, 'push');

app.FFButton.ButtonPushedFcn = createCallbackFcn(app, @FFButtonPushed, true);

app.FFButton.Position = [396 10 69 28];

app.FFButton.Text = 'FF';

% Create MediaPlayerHelperLabel

app.MediaPlayerHelperLabel = uilabel(app.UIFigure);

app.MediaPlayerHelperLabel.VerticalAlignment = 'top';

app.MediaPlayerHelperLabel.FontSize = 16;

app.MediaPlayerHelperLabel.FontWeight = 'bold';

app.MediaPlayerHelperLabel.Position = [242 379 158 20];

app.MediaPlayerHelperLabel.Text = 'Media Player Helper';

% Create InsertDiscButton

app.InsertDiscButton = uibutton(app.UIFigure, 'push');

app.InsertDiscButton.ButtonPushedFcn = createCallbackFcn(app, @InsertDiscButtonPushed, true);

app.InsertDiscButton.Position = [180 261 100 22];

app.InsertDiscButton.Text = 'Insert Disc';

% Create EjectDiscButton

app.EjectDiscButton = uibutton(app.UIFigure, 'push');

app.EjectDiscButton.ButtonPushedFcn = createCallbackFcn(app, @EjectDiscButtonPushed, true);

app.EjectDiscButton.Position = [363 261 100 22];

app.EjectDiscButton.Text = 'Eject Disc';

end

end

methods (Access = public)

% Construct app

function app = sf_mediaplayer_strings_ui

% 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

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