MATLAB-GUI

二十一、GUI设计

21.1创建GUI

双击任一区域，可以进行相关设置；

21.2 回调函数

案例一：实现按键后数据在静态框内显示指定文本

1. 首先我们需要先找到对应控件的命名；

1. 通过贯穿全局的handles来调用其他内容，来完成按键时数据显示再静态文本框内。

   function pushbutton1_Callback(hObject, eventdata, handles)
   % hObject    handle to pushbutton1 (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    structure with handles and user data (see GUIDATA)
   disp([hObject.String]);
   %handles可以理解为图像界面的所有信息.
   set(handles.text2,'String','训练完成')

   ```matlab %这个函数表示界面一经显示就会调用 function demo1_OpeningFcn(hObject, eventdata, handles, varargin)

% This function has no output args, see OutputFcn. % hObject handle to figure % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % varargin command line arguments to demo1 (see VARARGIN)

% Choose default command line output for demo1 handles.output = hObject;

disp([‘hello’]);

% Update handles structure guidata(hObject, handles);

% UIWAIT makes demo1 wait for user response (see UIRESUME) % uiwait(handles.figure1);

**案例二：再静态文本框内显示按按键的次数；**
1. 编辑OpeningFcn：
handles.count = 0;定义一个全局变量<br />%把handles当前的数据保存到gcf当中；<br />guidata(gcf,handles);
```matlab
function demo1_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to demo1 (see VARARGIN)
% Choose default command line output for demo1
handles.output = hObject;
handles.count = 0;
disp(['hello']);
% Update handles structure
guidata(hObject, handles);
%gcf是图形的句柄；
%把handles当前的数据保存到gcf当中；
guidata(gcf,handles);

1. 设置显示数据set(handles.text2,’String’,num2str(handles.count));

   保存数据；

   function pushbutton1_Callback(hObject, eventdata, handles)
   % hObject    handle to pushbutton1 (see GCBO)
   % eventdata  reserved - to be defined in a future version of MATLAB
   % handles    structure with handles and user data (see GUIDATA)
   handles.count = handles.count+1;
   %注意此处handles.count是过滤型变量，输出需要转换格式；
   %handles可以理解为图像界面的所有信息.
   %set(handles.text2,'String','训练完成')
   set(handles.text2,'String',num2str(handles.count));
   %注意对handles进行保存
   guidata(gcf,handles);

案例三；根据下拉菜单来显示图像

function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
%用str接受handles下的下拉菜单popupmenu1对应的所有字符
str = handles.popupmenu1.String;
%获取哪个值
val = handles.popupmenu1.Value;
%由于ezplot显示必须要显示函数句柄或者字符串类型
%而val此时为cell类型所以要完成转换；
fcn = str{val};
ezplot(fcn);

案例四：

function start_Callback(hObject, eventdata, handles)
% hObject    handle to start (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% --------------------------------------------------------------------
function open_Callback(hObject, eventdata, handles)
% hObject    handle to open (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
msgbox('你打开了')
demo2;
% --------------------------------------------------------------------
function close_Callback(hObject, eventdata, handles)
% hObject    handle to close (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
msgbox('你关闭了')
%questdlg返回一个所选择的值，后面的属性按照顺序来选。
r = questdlg('你要关闭吗？','关闭请求','是','否','否');
%相对于r=='是'来做判断，strcmp更加规范一些。
if strcmp(r,'是')
   close all;
end