当另一个通知被打开时，如何防止通知从通知中心消失?IOS [英] How to prevent a notification disappear from notification center when another one is opened? iOS

问题描述

我正在开发一个接收推送通知的应用.这个推送通知，每个都包含有价值的信息，当用户从中打开应用程序时会显示这些信息.

I'm developing an app that receives push notifications. This push notifications, each one contains valuable information that is showed up when the user opens the app from it.

我的问题是，如果用户收到多个通知，如果用户点击它并打开应用程序，所有其他通知都从通知中心消失，我丢失了所有其他重要信息.

My problem is that if the user receives more than one notification, if the user taps it and open the app, all the other ones disappear from the notification center and I lost all the other important information.

我希望能够离开/防止通知从通知中心消失，以便让用户可以选择继续从通知中心打开它们.有点像 YouTube 通知.我什至在 Twitch 应用通知中看到了这种行为.

I want to be able to leave/prevent the notifications from disappearing from the notification center in order to give the user the option to keep opening them from the notification center. Somehow like YouTube notifications. I even saw that behavior in Twitch app notifications.

有什么想法吗?谢谢.

推荐答案

我知道这是一个很老的问题，但由于它没有答案，我会告诉你我是如何解决这个问题的.

I know it's a pretty old question, but since it doesn't have an answer, I'll tell you how I solved this issue.

简而言之，该问题是由将UIApplication.shared.applicationIconBadgeNumber 设置为0 引起的；它正在从通知中心删除所有通知.

In short, the issue is caused by setting UIApplication.shared.applicationIconBadgeNumber to 0; it's making all of the notifications to be removed from the notification center.

解决方案是将applicationIconBadgeNumber 设置为用户在通知中心收到的实际通知数.我为此做了一个函数:

The solution is to set the applicationIconBadgeNumber to the real number of notifications the user has in the notification center. I made a function for this:

func updateIconBadge() {
    UNUserNotificationCenter.current().getDeliveredNotifications { notifications in
        DispatchQueue.main.async {
            UIApplication.shared.applicationIconBadgeNumber = notifications.count
        }
    }
}

现在你可以在application(_application:, didFinishLaunchingWithOptions:), applicationWillEnterForeground(_application:), applicationDidBecomeActive(_application:) 在 AppDelegate.swift 中以确保它会在应有的时候更新.

Now you can call this function in the methods application(_application:, didFinishLaunchingWithOptions:), applicationWillEnterForeground(_application:), applicationDidBecomeActive(_application:) in AppDelegate.swift to make sure it will update when it should be.

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