ios - 检查用户是否允许本地通知。 iOS 8.Obj-C

Question

是否没有简单的方法来测试用户是否允许本地通知？在我拒绝发送本地通知后，我注意到控制台中出现警告。当相关事件发生时，它表示即使用户不允许，该应用程序仍试图发送通知。我想在尝试显示通知之前检查它是否被允许。查看我的情况下的评论，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];
    }
}

我会像这样提示用户获得许可:

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吗？

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];
    }
}

Answer 1

这是我在不太具体的情况下使用的方法:

+ (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。