问题
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:
回答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.
来源：https://stackoverflow.com/questions/32815260/with-cncontactpickerviewcontroller-in-ios-9-0-how-to-enable-disable-single-or-m