5

我知道这里和那里有一些关于如何删除可能是全部或特定通知的本地通知的问题。我还浏览了本地通知类参考，发现了一些方法，如重复时间间隔、触发日期、警报正文、时区等……但我无法找到有关如何修改触发日期的信息已经设置好了。假设用户使用今天的日期和下午 4:50 的时间设置通知，但如果用户希望修改设置的日期/时间，则发生的情况是通知在两种情况下都被触发。就编程道德而言，这是一个错误！

实际上我想要的是必须取消以前的通知，即必须将日期修改为已编辑的通知，并且应该在新日期设置和触发通知。

这就是我设置通知的方式，示例代码：

- (void)setNotification
{
    //Set notification after confirmation of saved data

    Class cls = NSClassFromString(@"UILocalNotification");
    reminderNotification = [[cls alloc] init];

    if (cls != nil) 
    {        
       NSDateFormatter *dateFormat = [[[NSDateFormatter alloc]init]autorelease];
       [dateFormat setDateFormat:@"YYYY-MM-dd HH:mm:ss"];
       NSDate *notificationDate = [dateFormat dateFromString:textField2.text];
       reminderNotification.fireDate = notificationDate;
       reminderNotification.timeZone = [NSTimeZone defaultTimeZone];
       NSString *reminderText = [NSString stringWithFormat:@"%@ 's %@ on %@",textField.text,textField1.text,strDate];
       reminderNotification.alertBody = reminderText;
       reminderNotification.alertAction = @"View";
       reminderNotification.soundName = @"lazy_afternoon.mp3";
       reminderNotification.applicationIconBadgeNumber = 1;
       NSDictionary *userDict = [NSDictionary dictionaryWithObject:self.textField1.text forKey:kReminder];
       reminderNotification.userInfo = userDict;
       [[UIApplication sharedApplication] scheduleLocalNotification:reminderNotification];
       [reminderNotification release];
    }
}

如何处理这个任务？

4

2 回答 2

18

使用此方法安排 Notification ，其中 notificationID 必须是唯一的

 -(void) scheduleNotificationForDate:(NSDate *)date AlertBody:(NSString *)alertBody ActionButtonTitle:(NSString *)actionButtonTitle NotificationID:(NSString *)notificationID{

    UILocalNotification *localNotification = [[UILocalNotification alloc] init];
    localNotification.fireDate = date;
    localNotification.timeZone = [NSTimeZone localTimeZone];
    localNotification.alertBody = alertBody;
    localNotification.alertAction = actionButtonTitle;
    localNotification.soundName = @"yourSound.wav";

    NSDictionary *infoDict = [NSDictionary dictionaryWithObject:notificationID forKey:notificationID];
    localNotification.userInfo = infoDict;

    [[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
}

使用此方法取消具有该通知 ID 的特定通知

- (void)cancelLocalNotification:(NSString*)notificationID {
    //loop through all scheduled notifications and cancel the one we're looking for
    UILocalNotification *cancelThisNotification = nil;
    BOOL hasNotification = NO;

    for (UILocalNotification *someNotification in [[UIApplication sharedApplication] scheduledLocalNotifications]) {
        if([[someNotification.userInfo objectForKey:notificationID] isEqualToString:notificationID]) {
            cancelThisNotification = someNotification;
            hasNotification = YES;
            break;
        }
    }
    if (hasNotification == YES) {
        NSLog(@"%@ ",cancelThisNotification);
        [[UIApplication sharedApplication] cancelLocalNotification:cancelThisNotification];        
    }
}

参考： UILocalNotification

于 2012-06-21T13:14:17.163 回答
3

设置通知后，编辑它的唯一方法是取消旧通知并重新创建另一个通知，因此您可以这样做，搜索现有通知并取消它。

for(UILocalNotification *aNotif in [[UIApplication sharedApplication] scheduledLocalNotifications]) {
        if([[aNotif.userInfo objectForKey:@"id"] isEqualToString:nId]) {
            [[UIApplication sharedApplication]cancelLocalNotification:aNotif];
        }
    }

然后创建新通知。

于 2012-06-21T11:35:03.073 回答