1. If APNs attempts to deliver a notification but the device is offline, the notification is stored for a limited period of time, and delivered to the device when it becomes available.
假如用户手机不在线,可能没有信号或者关机吧,APNs会存储转发,等用户在线时再发送
2.Only one recent notification for a particular application is stored. If multiple notifications are sent while the device is offline, each new notification causes the prior notification to be discarded. This behavior of keepin......
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