Is there a way to ask the user the hours?

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André Magrinho
André Magrinho 2016-1-12
回答： Image Analyst 2016-1-12
I'm making a interactive clock , and one of the features that the clock have is a "reminder". I'd like to know if there is a way to ask the user at what time would he like to receive the pop-up message and if i could put it in a while . I'm imagining something like give a variable to the time inputed to the user, and then use a while cycle, so when the variable turns false ( a.k.a the time that the user inputed is the time "now" ) the reminder would pop up. Can someone help?

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Image Analyst
Image Analyst 2016-1-12
Here's a robust snippet using inputdlg() that you can adapt.
% Ask user for one integer number.
defaultValue = 45;
titleBar = 'Enter an integer value';
userPrompt = 'Enter the integer';
caUserInput = inputdlg(userPrompt, titleBar, 1, {num2str(defaultValue)});
if isempty(caUserInput),return,end; % Bail out if they clicked Cancel.
% Round to nearest integer in case they entered a floating point number.
integerValue = round(str2double(cell2mat(caUserInput)));
% Check for a valid integer.
if isnan(integerValue)
% They didn't enter a number.
% They clicked Cancel, or entered a character, symbols, or something else not allowed.
integerValue = defaultValue;
message = sprintf('I said it had to be an integer.\nI will use %d and continue.', integerValue);
uiwait(warndlg(message));
end

更多回答（1 个）

jgg
jgg 2016-1-12
编辑：jgg 2016-1-12
You'd still need some kind of a tic-cycle to poll the current time, which is probably the guts of your clock function. I think the thing you want is etime if you're using strings, but otherwise:
Basically, when the reminder is set call:
%get input time
t = input('Remind in how many seconds: ')
reminder_time = now + t;
timer_on = true;
Then just add a check on clock tic:
if now >= reminder_time && timer_on
popup_reminder() %your function
timer_on = false;
end
Probably better than using a while loop.

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