How to delete Keychain data when app is uninstalled?

Question

I have a problem . I am saving some critical information on device Keychain for my App, but when I uninstall the App and install it again, these data is still saved. How can delete these information when the application is uninstalled? If this is not possible, how detect when the App is first Load after install it without save information in NSUserDefaults?

Thank you very much.

Solution

This is work around , but may be will satisfy you: Store in NSUserDefaults flag, that keychain have data. If it's NO then ignore keychain.

Comments

[rckoenes]

NSUserDefault are not secure, it makes more sense to store it in a more save place like he KeyChain since the NSUserDefault are just stored as plain text.

[Jeffery Thomas]

@rckoenes I updated my answer. I think you want to use Data Protection.

[Paolpa]

Thank you Jeffery Thomas, very good alternative!

[orkoden]

You should not use NSUserDefaults for sensitive data like passwords or certificates.

[Cy-4AH]

@orkoden, anybody have said about storing passwords in NSUserDefaults? I am not.

[Cy-4AH]

@ta.speot.is. Thank you cap. Why -1?

[Cy-4AH]

@ta.speot.is, Have you minused answer in stackoverflow.com/questions/4747404/…? It's the same, but shorter.

[ta.speot.is]

Sorry, I misread your answer. I can't take back my downvote because I downvoted you a few hours ago, but if you make a small edit to your answer I can upvote it.

[ChuckZHB]

I disagree to save critical information in UserDefaults.