如何设置 UILocalNotification 的过期时间？
我想显示一个 UILocalNotification，但它的有效期只有 24 小时。 24 小时结束后，我希望通知“过期”；也就是说：用户无法再看到过时的通知。我该怎么做？
I would like to show a UILocalNotification, but it will only be valid for 24 hours. At the end of 24 hours, I want the notification to "expire"; that is: the user can no longer see the obsolete notification. How can I do this?
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要取消已发送的通知，请使用
UNUserNotificationCenter.current().removeDeliveredNotifications(withIdentifiers: ["myidentifier"])或
此答案中的示例代码：https://stackoverflow.com/a/45218609/2650588
To cancel already delivered notifications use
UNUserNotificationCenter.current().removeDeliveredNotifications(withIdentifiers: ["myidentifier"])or
Example code in this answer: https://stackoverflow.com/a/45218609/2650588
我指的是已经发出的通知。
我相信将徽章设置为零会清除现有通知。我将尝试看看这是否也会清除本地通知（除了推送通知之外）。
I'm referring to a notification that has already fired.
I believe that setting the badge to zero will clear out existing notifications. I will try to see whether this also clears local notifications (in addition to push notifications).
您可以使用 UIApplication.scheduledLocalNotifications 获取待处理通知的列表，然后取消您想要删除的通知。
You can use UIApplication.scheduledLocalNotifications to get a list of your pending notifications and then cancel the ones you want to get rid of.