Iphone persistant preferences after app delete

I want to store a date string in the iphone device, 开发者_运维知识库but not in the application context, because if a user deletes the app then that value is deleted too.

Is this possible?

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Store it in the keychain. Keychain data is not deleted when the app is.

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A possible solution is to store all the information on a server. You could use rails, php, or any other server framework to do this. Also, there's a new service that's trying to make it so you don't have to do any server coding at all: http://www.parse.com

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If the application gets deleted on iPhone, all its related files are also deleted. Including files, SQLite databases and preferences.

If you want preference to persist after deletion, you will need a server and allow the user to store that information there (in the cloud).