Can't Access Contacts Sources on Device in iOS 6

Question

This code worked OK on iOS 5.1 and also does work in the iPhone simulator with iOS 6. It fails silently on my iPhone 4 running iOS 6. The end result is that I cannot add a per

Answer 1

If you got here from Google and you're using iOS's new CNContactStore framework, and getting these errors, read on:

I thought it'd be cleaner to make my CNContactStore a member variable that was initialized with the class instance:

class foo {
    var contactStore = CNContactStore()

    func findByIdentifier(identifier: String) -> CNContact {
        let contact = try self.contactStore.unifiedContactWithIdentifier(identifier...
        return contact
    }
}

After I called this about fifty times, it started erroring out with

AB: Could not compile statement for query (ABCCopyArrayOfAllInstancesOfClassInSourceMatchingProperties)

I tried rate-limiting my calls, but that didn't help. It turned out that instantiating a new CNContactStore for every call had zero performance ramifications and completely solved the problem for me:

class foo {

    func findByIdentifier(identifier: String) -> CNContact {
        let contactStore = CNContactStore()
        let contact = try contactStore.unifiedContactWithIdentifier(identifier...
        return contact
    }
}

Hope this helps!