ios - 如何以编程方式检测 ios 推送通知权限/设置

Question

在通知设置中(Settings->Notifications->AnyAppName)，有5个项目，每个项目都有一个切换按钮，Sounds，Badge App Icon，在锁定屏幕上显示、在历史记录中显示、显示为横幅。

我正在使用 [[[UIApplication sharedApplication] currentUserNotificationSettings] types] 来获取用户的设置并提升相应的警报以供使用。它可能返回值 0~7 代表Sound、Badge 和Banners 的任意组合。问题是，我们是否能够检测到 Show on Lock Screen、Show in History 的状态？

另外，在设置页面的底部，有一个名为Show Previews的OPTIONS选项，它有三个选项:Always(Default)、When Unlocked 和 Never。我们是否能够为此以编程方式获取用户设置？

Answer 1

您应该使用从 iOS 10 开始支持的 UserNotifications 框架。这将允许您通过 UNUserNotificationCenter 的 getNotificationSettingsWithCompletionHandler: 函数检索 UNNotificationSettings。在 UNNotificationSettings 中，您可以检查一些值:

• notificationCenterSetting(在历史记录中显示)
• lockScreenSetting(在锁定屏幕上显示)
• alertSetting(显示为横幅)
• alertStyle(横幅的类型)

例如:

[[UNUserNotificationCenter currentNotificationCenter] getNotificationSettingsWithCompletionHandler:^(UNNotificationSettings * _Nonnull settings) {
    if(settings.authorizationStatus == UNAuthorizationStatusAuthorized) {
        //notifications are enabled for this app

        if(settings.notificationCenterSetting == UNNotificationSettingEnabled ||
          settings.lockScreenSetting == UNNotificationSettingEnabled ||
          (settings.alertSetting == UNNotificationSettingEnabled && settings.alertStyle != UNAlertStyleNone)) {
            //the user will be able to see the notifications (on the lock screen, in history and/or via banners)

            dispatch_async(dispatch_get_main_queue(), ^(){

                //now for instance, register for remote notifications
                //execute this from the main queue
                [[UIApplication sharedApplication] registerForRemoteNotifications];
            });
        }
        else {
            //the user must change notification settings in order te receive notifications
        }
    }
    else {
        //request authorization
        [[UNUserNotificationCenter currentNotificationCenter] requestAuthorizationWithOptions:(UNAuthorizationOptionBadge | UNAuthorizationOptionSound | UNAuthorizationOptionAlert) completionHandler:^(BOOL granted, NSError * _Nullable error) {
            if(granted) {
                dispatch_async(dispatch_get_main_queue(), ^(){

                    //now for instance, register for remote notifications
                    //execute this from the main queue
                    [[UIApplication sharedApplication] registerForRemoteNotifications];
                });
            }
            else {
                //user denied the authorization request
                //the user must change notification settings in order te receive notifications
            }
        }
    }
}];