特定时间的 iPhone 本地通知

Question

我想每周晚上 10 点(无论哪个国家/地区)发出通知。我需要使用时区吗？目前，我使用下面的代码每周触发通知，但如何在晚上 10 点准确触发通知。

NSDate *date = [NSDate date];
NSDate* myNewDate = [date dateByAddingTimeInterval:7*24*60*60];    
UILocalNotification *localNotification = [[UILocalNotification alloc] init];
localNotification.fireDate = myNewDate;
localNotification.timeZone = [NSTimeZone defaultTimeZone];
localNotification.repeatInterval = NSWeekCalendarUnit;
[[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
[localNotification release];

Answer 1

我认为将 fireDate 设置为您想要收到通知的当天的 22:00(而不是“从现在起一周后”)可以满足您的要求。您可能需要使用 NSCalendar 来执行此操作。

NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
NSDate *currentDate = [NSDate date];
NSDate *fireDate = nil;

[dateComponents setDay:3];  // ...or whatever day.
[dateComponents setHour:22];
[dateComponents setMinute:0];

fireDate = [gregorian dateByAddingComponents:dateComponents
                                      toDate:currentDate 
                                     options:0];

[localNotification setFireDate:fireDate];
[dateComponents release];