在iOS中，可以使用-

注册外部更改回叫通知器

ABAddressBookRef ntificationaddressbook = ABAddressBookCreate();
    ABAddressBookRegisterExternalChangeCallback(ntificationaddressbook, MyAddressBookExternalChangeCallback, self);

实施回拨-

void MyAddressBookExternalChangeCallback (ABAddressBookRef ntificationaddressbook,CFDictionaryRef info,void *context)
{
    // called when there is any change in AddressBook
}