當應用程序在 swift 3 中處於前台時隱藏特定視圖控制器的遠程通知

Question

我在我的聊天應用程序中使用了 firebase 通知，我正在將它發送到我的設備。我的問題是如何在特定的視圖控制器上隱藏遠程通知。當應用程序在我使用的前台時

UNUserNotificationCenter，將呈現委托方法

顯示橫幅，但是當我在 chatViewController 中時，我不想顯示通知橫幅、聲音、警報，例如我想要的應用程序功能..對不起我的英語

func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {

    let userInfo:[AnyHashable:Any] =  notification.request.content.userInfo
    print("\(userInfo)")

    completionHandler([.alert, .badge, .sound])
}

Answer 1

您可以使用以下方法找到當前的視圖控制器：

extension UIViewController {
    var topViewController: UIViewController? {
        return self.topViewController(currentViewController: self)
    }

    private func topViewController(currentViewController: UIViewController) -> UIViewController {
        if let tabBarController = currentViewController as? UITabBarController,
            let selectedViewController = tabBarController.selectedViewController {
            return self.topViewController(currentViewController: selectedViewController)
        } else if let navigationController = currentViewController as? UINavigationController,
            let visibleViewController = navigationController.visibleViewController {
            return self.topViewController(currentViewController: visibleViewController)
       } else if let presentedViewController = currentViewController.presentedViewController {
            return self.topViewController(currentViewController: presentedViewController)
       } else {
            return currentViewController
        }
    }
}

然后，在func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void)添加以下代碼：

if self.window?.rootViewController?.topViewController is ChatViewController {
    completionHandler([])
} else {
    completionHandler([.alert, .badge, .sound])
}

Answer 2

指定UNNotificationPresentationOptionNone使通知完全靜音。

UNNotificationPresentationOptionNone

Answer 3

傳遞空的 completionHandler([]) 以隱藏遠程通知。

func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent 
                            notification: UNNotification, 
                            withCompletionHandler completionHandler: 
                            @escaping (UNNotificationPresentationOptions) -> 
           Void) {

let userInfo:[AnyHashable:Any] =  notification.request.content.userInfo
print("\(userInfo)")

completionHandler([])
}

Answer 4

這對我們有用-

AppDelegate.m

// Called when a notification is delivered to a foreground app.
-(void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler
{
    completionHandler(UNNotificationPresentationOptionNone);
}