基本上：

localNotificationObject.applicationIconBadgeNumber++;

例：

UILocalNotification *localNotification = [[UILocalNotification alloc] init];
localNotification.fireDate = [[NSDate date] dateByAddingTimeInterval:20];
localNotification.alertBody = @"Some Alert";

//the following line is important to set badge number
localNotification.applicationIconBadgeNumber++;

[[UIApplication sharedApplication] scheduleLocalNotification:localNotification];

但问题是,徽章编号在后续(多个)本地通知中没有增加(这里有一个场景但是为了简单起见,我们只要说徽章在2个或更多,背靠背,本地通知后仍保持1 ).
在这种情况下,是的…推送通知似乎是要走的路
(但要注意推送通知并不总是可靠的……检查：link)

嗯…要使用推送通知进行正确的徽章编号更新,您应该知道可以在推送通知的有效负载中发送徽章计数.
收到此推送通知后,iOS会将徽章计数更改为推送通知中指定的徽章计数(& app不需要为此打开).

示例(续)：

将applicationIconBadgeNumber设置为0,因为它在某些情况下有帮助(可选)

- (void)applicationWillResignActive:(UIApplication *)application {
    [[UIApplication sharedApplication] setApplicationIconBadgeNumber:0];
}

- (void)applicationWillTerminate:(UIApplication *)application {
    [[UIApplication sharedApplication] setApplicationIconBadgeNumber:0];
}

额外：

您还可以在终止/关闭或辞职时手动设置徽章编号.
通常……在以下任何或所有方法中：

> -applicationWillResignActive
> -applicationDidEnterBackground
> -applicationWillTerminate(在应用关闭时设置badgeNumber)

例：

- (void)applicationWillResignActive:(UIApplication *)application {
    //Called when the application is about to move from active to inactive state.
    [[UIApplication sharedApplication] setApplicationIconBadgeNumber:[[[UIApplication sharedApplication] scheduledLocalNotifications] count]];
    //...
}

- (void)applicationWillTerminate:(UIApplication *)application {
    // Called when the application is about to terminate.
    [[UIApplication sharedApplication] setApplicationIconBadgeNumber:[[[UIApplication sharedApplication] scheduledLocalNotifications] count]];
    //...
}