Objective-C-在给定的时间/日期执行功能 [英] Objective-C - perform a function at given time/date

问题描述

如何在给定的时间和日期调用一个函数?例如，我想在午夜存储某些变量的某些值(并将它们清除为零)，以便可以将它们与前几天的值进行比较.

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.

我如何在Objective-C中完成此任务?

How might I accomplish this in Objective-C?

谢谢

杰克

推荐答案

根据您的需求，您有很多选择.

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

明显的起点是还有 performSelector withDelay函数族.

最后，我有时会使用一个很酷的扩展名，延迟的块.

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

哦，还有-您还可以设置

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

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