当您从 Apple AppStore 下载 iPhone 应用程序更新时，是部分下载还是完全重新下载？
我想知道，当Apple AppStore向用户推送应用程序更新时，当用户选择下载该应用程序更新时，是该应用程序的部分更新还是完全重新安装？
假设一种极端情况，开发人员只更新了应用程序中的一张图像，并将更新提交到应用程序商店，苹果是否聪明地交付了应用程序的更新部分，或者盲目地将整个新应用程序作为更新重新交付给最终用户？
I want to know, when Apple AppStore pushes an application updates to the user, and when the user chooses to download that application update, is it a partial updates or is it a complete reinstall for the application?
Assuming an extreme case, the developer only updated one image in the application and he submitted the updates to the app store, does apple smartly delivers the updated portion of the app, or it blindly redeliver the whole new application to the end user as an update?
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这是整个应用程序二进制文件的完整下载和重新安装，仅保留用户数据。这是为了减轻更新过程中任何其他不可逆转的损坏，因为如果更新本身损坏，那么只需回滚到设备上之前安装的内容即可，从而防止用户数据丢失。
来自 Apple 的开发者文档：
它并没有大声说这是一个完整的重新安装，但第一段已经很清楚地说明了原因。
It is a complete download and reinstall of the entire application binary, with only user data being preserved. This is to mitigate any otherwise irreversible corruptions during the update, since if the update itself is corrupted then it's just a matter of rolling back to what was previously installed on a device, preventing user data loss.
From Apple's developer docs:
It doesn't say out loud that it's a complete reinstall, however the first paragraph makes it quite clear why it is.