update date and time in gui

Question

Stalin Samuel 2016-1-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/264596-update-date-and-time-in-gui

评论： Rainaire Hansford 2019-5-25

function demo1()
    H.f = figure('Name','DEMO1');
    set(H.f,'Units','Pixels','Position',get(0,'ScreenSize'));% adjust figure size as per the screen size
    H.pb1 = uicontrol('style','push',...
                     'units','pixels',...
                     'position',[400 800 280 30],...
                     'fontsize',14,...
                     'string', datestr(now)); % datestr(now) is used to get current date and time                 
end

Now my intention is to update the date and time and it should be run like a real time clock

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Answer 1

Walter Roberson 2016-1-21

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https://ww2.mathworks.cn/matlabcentral/answers/264596-update-date-and-time-in-gui#answer_206885

You are going to want to use a timer to update the graphics. Odd that you would put it on a pushbutton rather than as a uicontrol('style','text'), but whatever.

The timer that does the update is going to need to get the handle of the graphics object to update. It would find that easier if you returned your H out of your function, or if you had at least added a Tag to the uicontrol so that it could (inefficiently but functionally) search all the graphics objects by name. As it is now, the timer is going to have to locate the figure by name and then dig inside the figure to find the uicontrol...