在iOS中使用soundName发出通知时没有声音

我正在寻找在测试项目的Objective-C中使用soundName的通知上的工作声音，但这不起作用

我使用了答案中的代码，但声音不起作用，我不明白为什么：（

在我的ViewController.m中

- (IBAction)startLocalNotification:(id)sender {
    NSLog(@"startLocalNotification");

    UILocalNotification *notification = [[UILocalNotification alloc] init];
    notification.fireDate = [NSDate dateWithTimeIntervalSinceNow:5];
    notification.alertBody = @"This is local notification!";
    notification.timeZone = [NSTimeZone defaultTimeZone];
    notification.soundName = UILocalNotificationDefaultSoundName;
    notification.applicationIconBadgeNumber = 10;

    [[UIApplication sharedApplication] scheduleLocalNotification:notification];
}

在我的AppDelegate中：

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

    if ([UIApplication instancesRespondToSelector:@selector(registerUserNotificationSettings:)]){

        [application registerUserNotificationSettings:[UIUserNotificationSettings
                                                       settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeBadge|
                                                       UIUserNotificationTypeSound categories:nil]];
    }

    [launchOptions valueForKey:UIApplicationLaunchOptionsLocalNotificationKey];
    return YES;
}

- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification {


    UIAlertView *notificationAlert = [[UIAlertView alloc] initWithTitle:@"Notification"    message:@"This local notification"
                                                               delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];

    [notificationAlert show];
}

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确保你的应用程序在后台，这样你就可以听到声音，否则你就听不到声音了。

你能发布你的代码吗？以及你面临的错误？这将帮助你得到答案。编辑。而且我没有错：/Just sound不起作用，通知是允许的，声音也来自simulator/iPhone。因此，模拟器和设备都是如此无法播放声音？请确保设备上的振铃器已打开。