Objective-C - perform a function at given time/date

Question

How might one get a function to be called at given time and date? For example, I would like to store some values of some variables at midnight (and clear them to zero) so they can be compared with the previous days values.

How might I accomplish this in Objective-C?

Thanks,

Jack

Will your app be running at midnight? The only reliable option is to have a server running on Microsoft Azure or something, which will execute the task at midnight. You can't assume your app will be launched at midnight on the device. — Abhi Beckert, May 18 '14 at 17:13

score 2 · Accepted Answer · answered Jan 27 '12 at 03:12

You've got quite a few options, depending on what you're after.

The obvious place to start is NSTimer.

There's also the performSelector withDelay function family.

Lastly, a cool extension I sometimes use, delayed blocks.

Oh, one more - you can also setup Local Notifications.

score 2 · Answer 2 · answered Jan 27 '12 at 03:12

2

Use NSTimer's initWithFireDate:interval:target:selector:userInfo:repeats: to set the time you want a method to be run.

answered Jan 27 '12 at 03:12

TheAmateurProgrammer

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Objective-C - perform a function at given time/date

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