当应用程序在后台时，iPhone PresentLocalNotificationNow 不会触发警报和声音

我有一个应用程序注册位置更新、运行测试，有时当我在应用程序处于后台时进入某个区域时，我会收到带有声音的警报通知。有时我只在通知中心看到通知，而没有收到任何声音和警报...... 您可以做什么来始终收到声音和警报通知？

这就是我的看法

 UILocalNotification *localNotif = [[UILocalNotification alloc] init];
 localNotif.fireDate             = nil;
 localNotif.hasAction            = YES;
 localNotif.alertBody            = fbName;
 localNotif.alertAction          = @"View";
 localNotif.soundName            = UILocalNotificationDefaultSoundName;

[[UIApplication sharedApplication]presentLocalNotificationNow:localNotif];

这是应用程序委托

- (void)application:(UIApplication *)application didReceiveLocalNotification (UILocalNotification *)notification
{
if (notification) 
{
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Alert"
                                                    message:notification.alertBody
                                                   delegate:self cancelButtonTitle:@"OK"
                                          otherButtonTitles:nil];


    [alertView show];

}

}

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

{

facebook = [[Facebook alloc] initWithAppId:kAppId andDelegate:self];

UILocalNotification *notification = [launchOptions objectForKey:UIApplicationLaunchOptionsLocalNotificationKey];

if (notification) 
{
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Alert"
                                                        message:notification.alertBody
                                                       delegate:self cancelButtonTitle:@"OK"
                                              otherButtonTitles:nil];


    [alertView show];

}



return YES;
}

如果应用程序在后台运行，本地通知将不会收到警报或声音，因为它是由您的应用程序直接接收的。在这种情况下，您需要使用以下方式呈现通知presentLocalNotificationNow.

- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification
{
    UIApplicationState applicationState = application.applicationState;
    if (applicationState == UIApplicationStateBackground) {
        [application presentLocalNotificationNow:notification];
    }
}