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?

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];

诀窍是将 NSDate 设置为午夜。检查

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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