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我正在尝试使用设置包来安排 UILocalNotification。在设置中，您可以选择是否希望每天（每天 1 次）、每 2 天 1 次、仅在周日或从不发送通知。

这是我使用的代码（全部在 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;
}

正如我所说，启动通知的代码是否正确？如果不是，它有什么问题？谢谢！

4

2 回答 2

6

每当用户更改首选项时，您似乎都在安排通知。但是，您永远不会取消安排之前安排的通知，这就是为什么您有时会观察到与您在一天或两天前反复更改设置的时间完全对应的通知突发。

您安排的通知与您打算修改的通知集是不同的对象。不幸的是，UILocalNotifications没有标识符令牌。

但是，只要您在重新安排之前defaultsChanged:收到一条消息，您就可以取消安排所有以前的通知。这将解决您的问题。[[UIApplication sharedApplication] cancelAllLocalNotifications];

还请仔细查看此解决方案，该解决方案建议即使在启动时也取消和重新安排通知，以避免在用户重新安装您的应用程序时出现突发或重复通知。

于 2013-11-02T16:06:25.400 回答
2

我有两个想法，

第一： 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，您的通知将不会弹出。

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 时区并将本地通知设置为在负时区触发，而这永远不会发生。

于 2013-11-07T15:10:14.710 回答