how can I remove duplicate Contact with OK alert button? - ios

Question

how can I remove duplicate Contact from my table view when tap OK alert button?
Here's my findDuplicateContacts()
#objc fileprivate func findDuplicateContacts() {
let keys = [CNContactIdentifierKey as CNKeyDescriptor, CNContactFormatter.descriptorForRequiredKeys(for: .fullName)]
let request = CNContactFetchRequest(keysToFetch: keys)
var contactsByName = [String: [CNContact]]()
do {
try self.contactStore.enumerateContacts(with: request) { contact, stop in
guard let name = CNContactFormatter.string(from: contact, style: .fullName) else { return }
contactsByName[name] = (contactsByName[name] ?? []) + [contact] // or in Swift 4, `contactsByName[name, default: []].append(contact)`
}
} catch let err {
print("error:", err)
}
let duplicates = contactsByName.filter { $1.count > 1 }
let alert = UIAlertController(title: "Alert", message: "Number of duplicates: \(duplicates.count)", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: {(action:UIAlertAction!) in
//HERE I WANT TO REMOVE DUPLICATES
print("you have pressed the ok button")
}))
alert.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.default, handler: nil))
self.present(alert, animated: true, completion: nil)
print(duplicates)
self.tableView.reloadData()
}
Thanks in advance for reply

Answer 1

You should use CNSaveRequest class func delete(_ contact: CNMutableContact) method, executing with func execute(_ saveRequest: CNSaveRequest) method of CNContactStore class
This example removes all other contacts and keeps only one (position 0) but you can add a method to determine which contact is more complete and keep that one
Full Code
alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: {(action:UIAlertAction!) in
print("you have pressed the ok button")
var arrayOfContactsRequests : [CNSaveRequest] = []
for dict in duplicates {
for (index,contact) in dict.value.enumerated() {
if(index != 0) {
let saveRequest = CNSaveRequest()
saveRequest.delete(contact.mutableCopy() as! CNMutableContact)
arrayOfContactsRequests.append(saveRequest)
}
}
}
debugPrint(duplicates)
for request in arrayOfContactsRequests {
do{
try self.contactStore.execute(request)
}
catch let err {
print("error:", err)
}
}
}))
This answer was possible with help of this answer How to convert CNContact to CNMutableContact?