In the iOS system, the keychain exists as a singleton. It can neither add a new keychain nor unlock it. These advanced features are only available in the OS X system!
Personally, I think that when using keychain, you generally only need to add, modify, and check functions. The data stored in the keychain is bound to the App. Even if the App is uninstalled, other Apps will not be able to obtain this data!
If you need to delete permissions, or the data will be cleared when the App is uninstalled, then it is recommended to use NSUserDefaults
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In the iOS system, the keychain exists as a singleton. It can neither add a new keychain nor unlock it. These advanced features are only available in the OS X system!
Personally, I think that when using keychain, you generally only need to add, modify, and check functions. The data stored in the keychain is bound to the App. Even if the App is uninstalled, other Apps will not be able to obtain this data!
If you need to delete permissions, or the data will be cleared when the App is uninstalled, then it is recommended to use NSUserDefaults