2017-01-09 255 views
1

我試圖做一個計時器,從20到0(秒)在GUIDE中倒計時。與此同時,用戶將執行一個簡單的操作(單擊組按鈕中的單選按鈕),並在20秒結束時顯示一條消息(取決於用戶點擊哪個按鈕)。 我環顧四周,但似乎沒有GUIDE的定時器對象(爲什麼不製作一個,因爲它非常有用?)。不過,我試圖讓一個和以下的結果,它不起作用。 我MyGUI_OpeningFcn初始化setappdata如何在MATLAB指南中製作倒數計時器?

% Initialize setappdata 
timeout = 20; 
setappdata(handles.figure1,'timeout', timeout); 

Next_calculation是單選按鈕,timerBox是一個靜態文本。

function Next_calculation_Callback(hObject, eventdata, handles) 
[..] 
timeout = getappdata(handles.figure1,'timeout'); 
t = timer('Period', 1.0,... % 1 second 
      'StartFcn', set(handles.timerBox,'String',num2str(timeout)), ... 
      'ExecutionMode', 'fixedRate', ... % Starts immediately after the timer callback function is added to the MATLAB execution queue 
      'TasksToExecute', timeout, ... % Indicates the number of times the timer object is to execute the TimerFcn callback 
      'TimerFcn', @my_timer ... % callback to function 
     ); 
start(t) 

一旦定時器開始,它調用TimerFcn調用my_timer。我應該通過my_timer的句柄,但我不知道如何。

function my_timer(hObject, eventdata) 
% I think I'm supposed to pass (hObject, eventdata) to my_timer 

% handles should be getting the current figure from hObject 
handles = guidata(ancestor(hObject, 'figure1')); 

timeout = getappdata(handles.figure1,'timeout'); 
t_left = timeout - 1.0; 
% show the updated time 
set(handles.timerBox,'String',num2str(t_left)); 
% update 'timeout' 
setappdata(handles.figure1,'timeout',t_left) 

回答

2

您需要使用自定義匿名函數爲TimerFcn必要的數據傳遞給你的計時器回調

set(t, 'TimerFcn', @(s,e)my_timer(hObject, handles)) 

然後你可以定義你my_timer回調爲

function my_timer(hObject, handles) 
    % Do stuff with handles 
end