问题
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
回答1:
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.
回答2:
Use NSTimer's initWithFireDate:interval:target:selector:userInfo:repeats: to set the time you want a method to be run.
来源：https://stackoverflow.com/questions/9028463/objective-c-perform-a-function-at-given-time-date