在iOS中使用soundName通知时没有声音

Question

我正在测试项目的Objective-C中使用soundName通知工作声音，但这不起作用。

我使用了how to create local notifications in iphone app回答的代码，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];
}

Answer 1

确保您的应用处于后台，这样您就可以听到声音，否则您将无法听到声音。