iphone - Access App Identifier Prefix programmatically

Question

How can I access the Bundle Seed ID/Team ID/App Identifier Prefix string programmatically? (These are all the same thing as far as I can tell).

I am using the UICKeychainStore keychain wrapper to persist data across several applications. Each of these applications has a shared keychain access group in their entitlement plists, and share the same provisioning profile. By default, the keychain services use the first access group in the plist as the access group to save data to. This looks like "AS234SDG.com.myCompany.SpecificApp" when I debug UICKeychainStore. I would like to set the access group to "AS234SDG.com.myCompany.SharedStuff", but I can't seem to locate how to get the "AS234SDG" string of the access group programmatically, and would like to avoid hard-coding it if possible.

Answer 1

Info.plist can have your own information and if you write a value with $(AppIdentifierPrefix), it is replaced to the real app identifier prefix at building phase.

So, try this:

In your Info.plist, add an info about app identifier prefix.

<key>AppIdentifierPrefix</key>
<string>$(AppIdentifierPrefix)</string>

You can then retrieve it programmatically with Objective-C:

NSString *appIdentifierPrefix =
    [[NSBundle mainBundle] objectForInfoDictionaryKey:@"AppIdentifierPrefix"];

and with Swift:

let appIdentifierPrefix =
    Bundle.main.infoDictionary!["AppIdentifierPrefix"] as! String

Note that appIdentifierPrefix ends with a period; e.g. AS234SDG.