Question

我正在尝试使用设置包来安排UILocalNotification。在设置中，您可以选择是否要每天（1 /天），每2天1次，仅在星期日或从不发送通知。

这是我使用的代码（这是在AppDelegate.m中）：

    -(void)defaultsChanged:(NSNotification *)notification {

         [[UIApplication sharedApplication] cancelAllLocalNotifications];

        [[NSUserDefaults standardUserDefaults]synchronize];
        NSString *testValue = [[NSUserDefaults standardUserDefaults] stringForKey:@"multi_preference"];

        NSLog(@"%@", testValue);

        NSDate *today = [NSDate date];

        NSCalendar* calendar = [NSCalendar currentCalendar];
        NSDateComponents* compoNents = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:today]; // Get necessary date components

        [compoNents month];[compoNents day];

        NSDictionary *dictToday= [self getDataFromdate : [compoNents day] month:[compoNents month]];


        if ([testValue isEqualToString:@"one"]){
            UILocalNotification* localNotification = [[UILocalNotification alloc] init];
            localNotification.fireDate = [[NSDate date]dateByAddingTimeInterval:20];
            localNotification.alertAction = @"View";
            localNotification.alertBody = [dictToday objectForKey:@"saint_description"];
            localNotification.repeatInterval = NSDayCalendarUnit;
            localNotification.timeZone = [NSTimeZone defaultTimeZone];
            localNotification.applicationIconBadgeNumber = [[UIApplication sharedApplication] applicationIconBadgeNumber] + 1;

            [[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
             [[NSNotificationCenter defaultCenter] postNotificationName:@"reloadData" object:self];

             }
        if (testValue==Nil){
            UILocalNotification* localNotification = [[UILocalNotification alloc] init];
            localNotification.fireDate = [[NSDate date]dateByAddingTimeInterval:20];
            localNotification.alertAction = @"View";
            localNotification.alertBody = [dictToday objectForKey:@"saint_description"];
            localNotification.repeatInterval = NSDayCalendarUnit;
            localNotification.timeZone = [NSTimeZone defaultTimeZone];
            localNotification.applicationIconBadgeNumber = [[UIApplication sharedApplication] applicationIconBadgeNumber] + 1;

            [[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
            [[NSNotificationCenter defaultCenter] postNotificationName:@"reloadData" object:self];

        }
        if ([testValue isEqualToString:@"two"]){

            UILocalNotification* localNotification = [[UILocalNotification alloc] init];
            localNotification.fireDate = [[NSDate date]dateByAddingTimeInterval:86401];
            localNotification.alertAction = @"View";
            localNotification.alertBody = [dictToday objectForKey:@"saint_description"];
            localNotification.repeatInterval = NSDayCalendarUnit;
            localNotification.timeZone = [NSTimeZone defaultTimeZone];
            localNotification.applicationIconBadgeNumber = [[UIApplication sharedApplication] applicationIconBadgeNumber] + 1;

            [[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
             [[NSNotificationCenter defaultCenter] postNotificationName:@"reloadData" object:self];

        }

        if ([testValue isEqualToString:@"three"]){
        NSDate *today2 = [[NSDate alloc] init];
        NSCalendar *gregorian = [[NSCalendar alloc]
                                 initWithCalendarIdentifier:NSGregorianCalendar];

        // Get the weekday component of the current date
        NSDateComponents *weekdayComponents = [gregorian components:NSWeekdayCalendarUnit
                                                           fromDate:today2];

        /*
         Create a date components to represent the number of days to subtract from the current date.
         The weekday value for Sunday in the Gregorian calendar is 1, so subtract 1 from the number of days to subtract from the date in question.  (If today is Sunday, subtract 0 days.)
         */
        NSDateComponents *componentsToSubtract = [[NSDateComponents alloc] init];
        [componentsToSubtract setDay: 0 - ([weekdayComponents weekday] - 1)];

        NSDate *beginningOfWeek = [gregorian dateByAddingComponents:componentsToSubtract
                                                             toDate:today2 options:0];

        /*
         Optional step:
         beginningOfWeek now has the same hour, minute, and second as the original date (today).
         To normalize to midnight, extract the year, month, and day components and create a new date from those components.
         */
        NSDateComponents *components =
        [gregorian components:(NSYearCalendarUnit | NSMonthCalendarUnit |
                               NSDayCalendarUnit) fromDate: beginningOfWeek];
        beginningOfWeek = [gregorian dateFromComponents:components];



            UILocalNotification* localNotification = [[UILocalNotification alloc] init];
            localNotification.fireDate = beginningOfWeek;
            localNotification.alertAction = @"View";
            localNotification.alertBody = [dictToday objectForKey:@"saint_description"];
            localNotification.repeatInterval = NSWeekdayCalendarUnit;
            localNotification.timeZone = [NSTimeZone defaultTimeZone];
            localNotification.applicationIconBadgeNumber = [[UIApplication sharedApplication] applicationIconBadgeNumber] + 1;

            [[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
            [[NSNotificationCenter defaultCenter] postNotificationName:@"reloadData" object:self];

        }
    }

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(defaultsChanged:)
                                                 name:NSUserDefaultsDidChangeNotification
                                               object:nil];

    UILocalNotification *locationNotification = [launchOptions objectForKey:UIApplicationLaunchOptionsLocalNotificationKey];
    if (locationNotification) {
        // Set icon badge number to zero
        application.applicationIconBadgeNumber = 0;
    }
return yes;
}
- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification
{




    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Today's Saint"
                                                    message:notification.alertBody
                                                   delegate:self cancelButtonTitle:@"OK"
                                          otherButtonTitles:nil];
    if (notification.alertBody!=Nil)
    [alert show];


     [[NSNotificationCenter defaultCenter] postNotificationName:@"reloadData" object:self];

    // Set icon badge number to zero
    application.applicationIconBadgeNumber = 0;
}

正如我所述，启动通知的代码是否正确？如果没有，它有什么问题？谢谢！

Answer 1

似乎您每当用户更改首选项时都会安排通知。但是，您永远不会取消预定以前安排的通知，这就是为什么您会在一天或两天前重复更改设置的时间内正好观察通知突发的原因。

您安排的通知是与您要修改的通知集不同的对象。不幸的是，UILocalNotifications没有标识符令牌。

但是，如果您在重新安排之前收到defaultsChanged: 的[[UIApplication sharedApplication] cancelAllLocalNotifications];消息，则可以取消预先计算所有先前的通知。这将解决您的问题。

另请仔细查看this solution，建议在发布时取消并重新安排通知，以避免在用户重新安装应用时发生突发或重复通知。

Answer 2

我有两个想法，

首先：dictToday的价值是什么？

NSDictionary *dictToday= [self getDataFromdate : [compoNents day] month:[compoNents month]];
[dictToday objectForKey:@"saint_description"]

如果此值为nil，则不会弹出通知。

第二：检查您的时区和从以下位置返回的时区：

[NSTimeZone defaultTimeZone]

您可能处于+3时区，并将您的本地通知设置为在负时区点火，而且永远不会发生。

iOS UILocalNotification设置为每天触发一次，每两天触发一次，并且仅在星期日触发

2 个答案: