I would like to build an app which retrieves images from my server. My problem is that I want it to work in the background and only when there is a new image to load.
这似乎与我所需要的通知非常相似:
I guess what I want became possible with the new iOS4. Please tell me if this is feasible. Any links for how to even start thinking about it would be great. Thanks.
它取决于你指的是什么背景。
如果你表示,你的申请正在运行,而且你有点读物,可以照相。
如果你表示你的申请被中止,你仍然希望使用PUSH通知并获得图像。 我担心这是不可能做到的。 在您提出申请时,其完成目前任务的时间非常有限。 届时,你的申请不能做任何事。
您在申请暂停时可以收到一些推动通知和当地通知,如全球定位系统、服务器通知,但只能收到服务器通知,不能下载新的形象。 这里是Devap文件的指示:
When the operating system delivers a local or push notification and the target application is not running in the foreground, it presents the notification (alert, icon badge number, sound). If there is a notification alert and the user taps the action button (or moves the action slider), the application launches and calls the UIApplicationDelegate method application:didFinishLaunchingWithOptions:, passing in the local-notification object or remote-notification payload. If the application is running in the foreground when the notification is delivered, the application:didReceiveRemoteNotification: or application:didReceiveLocalNotification: method of the application delegate is invoked.
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我希望我与四舍五入的累进角进行网上讨论。
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