存储在NSUserDefaults中的数据是否会通过应用程序更新和应用程序重新安装（删除安装）持续存在？ [英] Is data stored in NSUserDefaults persists through application updates and on application reinstallation (remove-install)?

问题描述

这对我的应用程序很重要，因为我想在那里存储应用程序UDID，Apple建议从iOS 5.0开始创建应用程序特定的UDID。

It's important to my app, becuase I want to store app UDID there, and Apple recommends to create app specific UDID starting from iOS 5.0.

推荐答案

用户默认值通过更新保留，但不会通过删除和重新安装应用程序来保留。目前，通过删除和重新安装应用程序来保持钥匙串，但它没有记录为一种或另一种方式，因此依赖此行为可能存在风险。

User defaults are persisted through updates but are not persisted through deleting and re-installing the app. At present, the keychain is persisted through deleting and re-installing the app, but it's not documented to be one way or the other, so relying on this behavior may be risky.

您还可以将值写入iCloud键/值存储区。这将在该用户的应用程序的所有安装中保留，并且是它的设计类型。

You could also write the value to the iCloud key/value store. That will be persisted across all installations of the app for that user and is kind of what it was designed for.

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