设置滑块步骤以及默​​认的最小值和最大值

Question

I am trying to set min and max values of my slider when it creates.

function slider2_CreateFcn(hObject, eventdata, handles)
% hObject    handle to slider2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called
% Hint: slider controls usually have a light gray background.
if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor',[.9 .9 .9]);
end
set(hObject, 'Max', 10, 'Min', 1);

but when the GUI opens, it throws and error and slider disappears

Warning: slider control can not have a Value outside of Min/Max range
Control will not be rendered until all of its parameter values are valid 
> In openfig at 135
  In gui_mainfcn>local_openfig at 286
  In gui_mainfcn at 234
  In gui at 44 
Warning: slider control can not have a Value outside of Min/Max range
Control will not be rendered until all of its parameter values are valid 
Warning: slider control can not have a Value outside of Min/Max range
Control will not be rendered until all of its parameter values are valid 

And i am trying to set the slider steps as 1. even when it is dragged or when the increase/decrease button is used.

function slider2_Callback(hObject, eventdata, handles)
% hObject    handle to slider2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'Value') returns position of slider
%        get(hObject,'Min') and get(hObject,'Max') to determine range of slider

    set(handles.slider2, 'SliderStep' , [1/9,1/9] );
sliderValue = get(handles.slider2,'Value');
 set(handles.edit2,'String',sliderValue)

I have chosed 1/9 because, for unit steps i need to choose maxvalue-minvalue

Any leads on where i am going wrong will be helpful

Answer 1

You will want to specify the Value in your CreateFcn as well because by default, the value will be 0 which is outside of your Min / Max range which will cause the uicontrol to not be rendered. Also, I would recommend setting the SliderStep from within the CreateFcn as well

function slider2_CreateFcn(hObject, eventdata, handles)
    if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
        set(hObject,'BackgroundColor',[.9 .9 .9]);
    end

    set(hObject, 'Max', 10, 'Min', 1, 'Value', 1, 'SliderStep', [1/9 1/9]);

Also if you want to force the slider value to always be an integer (even when dragged), you can round the Value property inside of the slider's callback

function slider2_Callback(hObject, eventdata, handles)
    value = round(get(handles.slider2, 'Value'));
    set(handles.slider2, 'Value', value);

    % Do whatever you need to do in this callback
end