如这个 SO 答案中所述，我们必须发送另一个推送通知以清除之前发送的通知.

As mentioned in this SO answer we have to send another push notification to clear previously sent notifications.

该通知应包含 badge:0，并省略 alert 和 sound 字段，然后它也会从通知中心删除通知作为清晰的应用标志.

That notification should contain badge:0, and omit the alert and sound fields, then it will remove notifications from notification centre as well as clear app badge.