Re: Storing a value to access across app launches and even re-install
Re: Storing a value to access across app launches and even re-install
- Subject: Re: Storing a value to access across app launches and even re-install
- From: Graham Cox <email@hidden>
- Date: Wed, 20 Aug 2014 10:00:14 +1000
On 19 Aug 2014, at 3:25 pm, Navneet Kumar <email@hidden> wrote:
> I need to store a numeric value in the system and update and access it across every launch of my app.
NSUserDefaults
> Also is it possible to safely store it in the system so that it can be picked up even after a re-install of my app?
NSUserDefaults
> I want it to be secure, so that even a os x savvy user may not be able to delete/modify this value.
Not really possible - the user owns their own computer, they can do with them as they wish. However, there are ways to hide a setting so that it's harder to find. An easy-ish solution is to use CFPreferences in the 'by host' domain. It's not very hidden, but slightly more so than the normal user defaults. You can also write a value to a file in all sorts of locations (notwithstanding what sandbox might have to say about it) but a determined user can always find it and delete it. This is right and proper - as a user I have every right to know exactly what my computer is doing, and no part of it should be hidden or inaccessible from me.
--Graham
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