requestAccess

func requestAccess() {
        let store = CNContactStore()
        switch CNContactStore.authorizationStatus(for: .contacts) {
        case .authorized:
            self.getContacts()
        case .denied:
            store.requestAccess(for: .contacts) { granted, error in
                if granted {
                    self.getContacts()
                }
            }
        case .restricted, .notDetermined:
            store.requestAccess(for: .contacts) { granted, error in
                if granted {
                    self.getContacts()
                }
            }
        @unknown default:
            print("error")
        }
    }