【Swift】UNNotificationServiceExtension
一、简介 An object that modifies the content of a remote notification before it's delivered to the user. 是一个能在远程通知传递到用户之前进行修改内容的对象。 二、概述 A UNNotificationServiceExtension object provides the entry point for a Notification Service app extension, which lets you customize the content of a remote notification before it is delivered to the user. A Notification Service app extension doesn't present any UI of its own. Instead, it is launched on demand when a notification of the appropriate type is delivered to the user’s device. You use this extension to modify the notification’s content or download