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2013-08-22T21:12:22.677
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I want to warn against calling <pre><code>[[UIApplication sharedApplication] setApplicationIconBadgeNumber:bg_NUM] </code></pre> from <pre><code>- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification </code></pre> method! If your scheduled local notification with some badge number, then badge will be set asynchronously some milliseconds after enter to -didReceiveLocalNotification for sample: <pre><code>-(void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification { [[UIApplication sharedApplication] setApplicationIconBadgeNumber:0]; // ^^^ maybe not reset badge to 0!! ^^^ } </code></pre> another code: <pre><code>-(void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification { sleep(1); //waiting for system is set our scheduled badge [[UIApplication sharedApplication] setApplicationIconBadgeNumber:0]; // ^^^ most chances for reset badge to 0 ^^^ } </code></pre> Testing code, screen touches schedule local notifications and calculate delay before system real set badge: <pre><code>- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { [[UIApplication sharedApplication] setApplicationIconBadgeNumber:0]; UILocalNotification *localNotif = [[[UILocalNotification alloc] init] autorelease]; localNotif.applicationIconBadgeNumber = rand()%100+1; localNotif.fireDate = [NSDate dateWithTimeIntervalSinceNow:1]; [[UIApplication sharedApplication] scheduleLocalNotification:localNotif]; } [...] - (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification { CFAbsoluteTime startTime = CFAbsoluteTimeGetCurrent(); while ([UIApplication sharedApplication].applicationIconBadgeNumber == 0) sleep(0); NSLog(@"badge set: %d after %f sec.", [UIApplication sharedApplication].applicationIconBadgeNumber, CFAbsoluteTimeGetCurrent()-startTime); } </code></pre> output: <pre><code>badge set: 41 after 0.000839 sec. badge set: 9 after 0.000754 sec. badge set: 56 after 0.076026 sec. badge set: 17 after 0.069889 sec. badge set: 8 after 0.056245 sec. badge set: 71 after 0.120729 sec. badge set: 28 after 0.122720 sec. badge set: 17 after 0.000758 sec. </code></pre> this testing in iOS 4.2/4.3/5.0/6.1 on different devices Be careful when you reset badge number in -didReceiveLocalNotification message! (this true only for LocalNotification /not remote push/ and only if application is active on receive moment)
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