检查用户是否允许本地通知. iOS 8. Obj-C

如果用户允许本地通知,是否没有简单的测试方法？在我拒绝发送本地通知后,我在控制台中发现了警告.当相关事件发生时,它表示该应用程序尝试发送通知,即使用户不允许它.我想在尝试显示通知之前检查是否允许它.在我的情况下看评论,我该怎么做？

我的代码是：

app = [UIApplication sharedApplication];
-(void)showBackgroundNotification:(NSString *) message {
//check if app is in background and check if local notifications are allowed.
    if (app.applicationState == UIApplicationStateBackground /*&& LocalNotificationsAreAllowed*/){
        UILocalNotification *note = [[UILocalNotification alloc]init];
        note.alertBody = message;
        note.fireDate = [NSDate dateWithTimeIntervalSinceNow:0.0];
        [app scheduleLocalNotification :note];
    }
}

我得到用户的提示,如下所示：

UIUserNotificationSettings *settings;
if ([app     respondsToSelector:@selector(registerUserNotificationSettings:)])
{
    settings = [UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeBadge|UIUserNotificationTypeAlert|UIUserNotification    TypeSound) categories:nil];
    [app registerUserNotificationSettings:settings];
}

我不能使用设置对象？

编辑：我想我已经解决了.这似乎有效.

-(void)showBackgroundNotification:(NSString *) message {
    if (app.applicationState == UIApplicationStateBackground && [app currentUserNotificationSettings].types != UIUserNotificationTypeNone){
        UILocalNotification *note = [[UILocalNotification alloc]init];
        note.alertBody = message;
        note.fireDate = [NSDate dateWithTimeIntervalSinceNow:0.0];
        [app scheduleLocalNotification :note];
    }
}

解决方法

这是我在不太具体的情况下使用的内容：

+ (BOOL)notificationsEnabled {
    UIUserNotificationSettings *settings = [[UIApplication sharedApplication] currentUserNotificationSettings];
    return settings.types != UIUserNotificationTypeNone;
}

我通常在通知管理器中保留一组这些类型的方法.