21

我正在尝试使用UILocalNotification. 从逻辑上讲，您会认为这可以通过将实例设置 applicationIconBadgeNumber为UILocalNotification0 来完成。但它不起作用，并且 applicationIconBadgeNumber 的文档说“默认值为 0，这意味着“没有变化”。

那么，一旦设置了本地通知，就真的没有办法清除带有本地通知的徽章了吗？

更新：一些简单的代码：

-(void)applicationDidFinishLaunching
{
    // Set the appication icon badge to 1 in 10 minutes, using a local notification so it works in the background:
    // This works fine.

    UILocalNotification *episodeNotification = [[UILocalNotification alloc] init];
    episodeNotification.fireDate = [NSDate dateWithTimeIntervalSinceNow:(60 * 10)];
    episodeNotification.timeZone = [NSTimeZone defaultTimeZone];
    episodeNotification.applicationIconBadgeNumber = 1;

    [[UIApplication sharedApplication] scheduleLocalNotification:episodeNotification];
    [episodeNotification release];


    // Clear the application icon badge in 20 minutes, again using a local notifcation so it works in the background:
    // This doesn't work.  According to the docs for local notification it's not supposed to
    // because (applicationIconBadgeNumber = 0) means "Do not change the badge"
    // I'm looking for an alternative if it exists.

    UILocalNotification *clearEpisodeNotification = [[UILocalNotification alloc] init];
    clearEpisodeNotification.fireDate = [NSDate dateWithTimeIntervalSinceNow:(60 * 20)];
    clearEpisodeNotification.timeZone = [NSTimeZone defaultTimeZone];
    clearEpisodeNotification.applicationIconBadgeNumber = 0;

    [[UIApplication sharedApplication] scheduleLocalNotification:clearEpisodeNotification];
    [clearEpisodeNotification release];
}
4

2 回答 2

28

我有同样的问题。从本地通知设置徽章时，将其设置为 0 是“无更改”的默认值，而直接从应用程序执行此操作会清除它。通过本地通知将其设置为负数解决了该问题。

尝试：

clearEpisodeNotification.applicationIconBadgeNumber = -1;
于 2011-06-09T06:09:25.783 回答
19

是的，可以从应用程序本身清除徽章。

我在我的一个应用程序中使用下面的代码，它按预期工作（即清除徽章）：

//clear app badge
[UIApplication sharedApplication].applicationIconBadgeNumber=0;
于 2011-03-21T08:43:44.403 回答