ios - 获取收到远程通知的日期

Question

我希望能够获取在 iOS 设备上收到远程通知的日期。

我正在尝试确定从我的服务器发出推送通知到在用户设备上收到推送通知之间的延迟量。

Answer 1

在应用程序委托(delegate)的 application:didReceiveRemoteNotification:fetchCompletionHandler: 中，创建一个包含当前日期的 NSDate，然后将其保存在 NSUserSettings 的数组中或直接保存在数组中。

有了这个，您甚至可以拥有收到通知的历史记录，并可以在以后处理它们。

application:didReceiveRemoteNotification:fetchCompletionHandler: 仅当您将值为 1 的 content-available 键添加到通知负载中时，才会在后台调用。

来自 Apple 文档:

For a push notification to trigger a download operation, the notification’s payload must include the content-available key with its value set to 1. When that key is present, the system wakes the app in the background (or launches it into the background) and calls the app delegate’s application:didReceiveRemoteNotification:fetchCompletionHandler: method. Your implementation of that method should download the relevant content and integrate it into your app. https://developer.apple.com/library/prerelease/ios/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/BackgroundExecution/BackgroundExecution.html