With CNContactPickerViewController in iOS 9.0, how to enable/disable single or multiple selection?

Question

The delegate CNContactPickerDelegate have methods for single and multiple selections. But how do we specify we want single or multiple selection when we present the view controller?

I guess I miss something that perhaps also causes the problem I have described in: CNUI ERROR Selection predicates are set but the delegate does not implement contactPicker:didSelectContact:

Answer 1

You need to implement ONLY the method you need.

If you want only one contact, implement:

contactPicker:didSelectContact:

If you want multiple selection, implement:

contactPicker:didSelectContacts:

If you want select one property for one contact, implemente:

contactPicker:didSelectContactProperty:

And the last one, don't know how work, looks like a bug, because if I implement it, I get the multiple contact selection UI, but can't select properties.

contactPicker:didSelectContactProperties:

EDIT: Finally I got some data from didSelectContactProperties, this method required a definition in predicateForSelectionOfProperty. I think the name is incorrect, should be didSelectContactsProperties, because I got the properties for multiple contacts.