在特定日期触发UILocalNotification [英] Fire UILocalNotification in a specific Date

问题描述

我想在特定的日期触发UILocalNotification.如果我使用此代码:

I want to fire a UILocalNotification in a specific Date. If I use this code:

NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [gregorian components:NSYearCalendarUnit | NSMonthCalendarUnit |  NSDayCalendarUnit fromDate:[NSDate date]];

[components setHour:4];
[components setMinute:0];

NSDate *fireDate = [gregorian dateFromComponents:components];

如果现在是下午3点，则可以正常工作，但例如到下午5点时，则不能正常工作.

If now it's 3 pm this works fine, but it doesn't when, for example, it's 5 pm.

如何将通知触发日期设置为下一个下午4点"?

How can I set the notification fire date to "the next 4 pm" ?

推荐答案

NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [gregorian components:NSYearCalendarUnit | NSMonthCalendarUnit |  NSDayCalendarUnit fromDate:[NSDate date]];

[components setHour:4];
[components setMinute:0];

NSDate *fireDate = [gregorian dateFromComponents:components];
 NSLog(@"Fire date : %@",fireDate);// Today 4pm is already passed. So you wont get notification 

// You need to check if the time is already passed
if ([fireDate compare:[NSDate date]] == NSOrderedAscending)
{
    // Schedule it for next day 4pm
    components.day = components.day+1;
    fireDate = [gregorian dateFromComponents:components];
}
NSLog(@"Fire date : %@",fireDate);

这篇关于在特定日期触发UILocalNotification的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！