我可以在新的一天开始时收到通知吗? [英] Can i get a notification, when a new day begins?
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问题描述
在Cocoa,有一个通知,我可以注册,当一个新的一天开始,在00h:00min:01s在早上通知我?
In Cocoa, is there a notification i can register for, that informs me, when a new day begins - at 00h:00min:01s in the morning?
推荐答案
没有我知道的通知。每当新的一天开始,你可以得到一个定时器:
There's no notification that I know of. You can get a timer to fire whenever a new day begins like so:
[[NSTimer alloc] initWithFireDate:midnight
interval:60 * 60 * 24 //one day, in seconds
target:someObj
selector:@selector(someSelector)
userInfo:nil
repeats:YES];
The trick is getting an NSDate
set to midnight. Check the Date and Time Programming Guide for how to do that with date components and the like.
编辑:参见这个问题如何获得午夜 NSDate
。
see this question for how to get the midnight NSDate
.
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