Callback in push button doesn't work

Question

mat 2016-2-4

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https://ww2.mathworks.cn/matlabcentral/answers/266608-callback-in-push-button-doesn-t-work

回答： mat 2016-2-9

Hey I have a simple if function that I want to start with a GUI pushbutton. It only works when I put uiwait before the if (local function) and the uiresume in in the callback function. In debug mode it works without it. How can I preclude using uiwait?

Matlab function

run GUI.m
global start
while true
uiwait;
if start
...
end
end

My GUI pushbutton callback function:

% --- Executes on button press in pushbuttonstart.
function pushbuttonstart_Callback(hObject, eventdata, handles)
% hObject    handle to pushbuttonstart (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
 global start
 start=true;
 uiresume;

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Ingrid 2016-2-4

your question is not really clear as the code you past is not a function. Could you give a bit more information and code i.e. the actual pushbutton callback and explain what you are trying to achieve

mat 2016-2-4

I updated the code

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Answer 1

mat 2016-2-9

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https://ww2.mathworks.cn/matlabcentral/answers/266608-callback-in-push-button-doesn-t-work#answer_209140

Seems like drawnow did the trick.

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Answer 2

Walter Roberson 2016-2-4

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https://ww2.mathworks.cn/matlabcentral/answers/266608-callback-in-push-button-doesn-t-work#answer_208545

If you have code that needs to delay until a button is pushed, then you should put the code itself (or a call to it) into the callback of the pushbutton.