UNUserNotificationCenter.current().getDeliveredNotifications仅返回一个空数组 [英] UNUserNotificationCenter.current().getDeliveredNotifications only ever returns an empty array

问题描述

基本上，我只是想打印我的应用程序已发送的通知，但是要做的是:

Basically, I'm simply trying to print the notifications that my app has delivered, but doing something like:

UNUserNotificationCenter.current().getDeliveredNotifications { (notifications) in
    print(notifications)
}

即使通知中心包含多个已传递的通知，

也只会在Xcode控制台中显示一个空数组.( print(notifications.count)返回0)

just displays an empty array in the Xcode console, even when the notification center contains several delivered notifications. (print(notifications.count) returns 0)

我可以使用 getPendingNotificationRequests 成功地获取已调度但尚未发送的通知，进行更新，甚至使用 removePendingNotificationRequests(withIdentifiers:)删除它们.但是，任何试图访问/修改/删除已交付内容的尝试均不起作用.

I can use getPendingNotificationRequests to successfully grab the notifications that are scheduled yet undelivered, update them, and even remove them with removePendingNotificationRequests(withIdentifiers:). But any attempt to access/modify/remove anything that's been delivered does not work.

我在这里错过了一些简单的东西吗?iOS 10+访问传递的通知的方式最近是否有所改变?

Am I missing something simple here? Did something change recently with the way iOS 10+ accesses the delivered notifications?

推荐答案

我确实遇到了与 getDeliveredNotification 相同的问题，通知数组始终为空.

I did face the same problem with getDeliveredNotification, the array of notifications were always empty.

因此，我意识到我正在将 [UIApplication sharedApplication] .applicationBadgeNumber 设置为 0 ，从而清除了来自通知中心的所有远程通知.

So, I realized that I was setting [UIApplication sharedApplication].applicationBadgeNumber to 0, what clear all remote notifications from notification center.

现在，仅在收到所有待处理的通知后，我才将 applicationBadgeNumber 设置为 0 .

Now I set applicationBadgeNumber to 0 only after I get all pending notifications.

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