Adding a sandboxed app to an app group

This is a relatively simple task that is complicated by confusing documentation. After viewing the documentation it looked relatively simple to add applications to a group. Just add some magic to the entitlements and use the containerURLForSecurityApplicationGroupIdentifier: method of NSURL. The only problem was that as far as I can tell NSURL does not have a containerURLForSecurityApplicationGroupIdentifier: method.

The key to add looks something like this:


The random numbers are your development team ID. I believe that can be found by looking at your developer ID certificate in keychain viewer (someone correct me if I am wrong). After the period you can put whatever you want as long as it matches the string in the other applications you want to be part of a group.

Once you do this all applications sharing that key will have access to:

~/Library/Group Containers/<application-group-id>

Without the containerURLForSecurityApplicationGroupIdentifier: there isn’t a great way to get this path. I just did:

NSString *groupContainer = [@"~/../../../Group Containers/" stringByExpandingTildeInPath];

Let me know if anyone knows of a better way to create app groups.


Now read this

Dealing with Slow Security Scoped Bookmarks

As I mentioned in a previous post I found security scoped bookmarks to be up to 220 times slower than regular bookmarks. Since my application was already using security scoped bookmarks to track many resources this caused major... Continue →