iPhone：如何设置重复的每日/每小时本地通知？

Question

我想测试添加本地通知。我希望它每天/每小时重复一次。我该怎么做？

NSCalendar *calendar = [NSCalendar autoupdatingCurrentCalendar];

 // Get the current date
    NSDate *now = [NSDate date];

 // Break the date up into components
NSDateComponents *dateComponents = [calendar components:( NSYearCalendarUnit |       NSMonthCalendarUnit |  NSDayCalendarUnit )
           fromDate:now];

NSDateComponents *timeComponents = [calendar components:( NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit)
           fromDate:now];


 // Set up the fire time
NSDateComponents *dateComps = [[NSDateComponents alloc] init];

[dateComps setDay:[dateComponents day]];
[dateComps setMonth:[dateComponents month]];
[dateComps setYear:[dateComponents year]];

[dateComps setHour:[timeComponents hour]];
 [dateComps setMinute:[timeComponents minute]];
 [dateComps setSecond:[timeComponents second]+10];

 // Notification will fire in one minute

NSDate *itemDate = [calendar dateFromComponents:dateComps];
[dateComps release];

UILocalNotification *localNotif = [[UILocalNotification alloc] init];
if (localNotif == nil)
    return;

localNotif.fireDate = itemDate;
localNotif.timeZone = [NSTimeZone defaultTimeZone];

 // Notification details
localNotif.alertBody = @"Hello World";

 // Set the action button
localNotif.alertAction = @"View";
localNotif.soundName = UILocalNotificationDefaultSoundName;

applicationIconBadgeNumber++;

localNotif.applicationIconBadgeNumber = applicationIconBadgeNumber;

 // Schedule the notification
[[UIApplication sharedApplication] scheduleLocalNotification:localNotif];
[localNotif release];

Answer 1

如果你想在每天的特定时间设置通知......那么你需要设置通知 repeatInterval 属性。它的iOS句柄;关于通知的自己的。只需添加这一行……​​你错过了。否则，您的代码很好并且可以工作。

notif.repeatInterval = NSDayCalendarUnit;

Answer 2

如果您使用 dateByAddingComponents:toDate:options:，您的代码会简单得多。

（dateByAddingTimeInterval：不能正确处理日历，例如时区更改。）

如果您希望它重复，我认为您必须添加几个，或者在您的应用下次启动时重新添加它们。否则，每秒重复的通知会非常烦人。

Answer 3

查看本教程：http://useyourloaf.com/blog/2010/9/13/repeating-an-ios-local-notification.html

Answer 4

UILocalNotification *localNotif = [[UILocalNotification alloc] init];
if (localNotif == nil) return;

NSDate *fireTime = [[NSDate date]   dateByAddingTimeInterval:900]; // 15 minutes

localNotif.fireDate = fireTime;
localNotif.alertBody = @"15 min reached";
localNotif.repeatInterval=kCFCalendarUnitMinute;
[[UIApplication sharedApplication] scheduleLocalNotification:localNotif];