lifetime/Lifetime/ContactListViewController.swift at f04d60b0b86a2e1d4c3d4dc5e3da2ffcdc002020 · iOS-Dev-Kurs/lifetime · GitHub

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//
//  MasterViewController.swift
//  Lifetime
//
//  Created by Nils Fischer on 29.04.16.
//  Copyright © 2016 iOS Dev Kurs Universität Heidelberg. All rights reserved.
//

import UIKit
import Contacts


class ContactListViewController: UITableViewController {

    /// A reference to the device's contacts
    var contactStore: CNContactStore? {
        didSet {
            loadContacts()
        }
    }


    // MARK: Contact Loading

    private var contacts: [CNContact] = [] {
        didSet {
            tableView.reloadData()
        }
    }

    private let requiredContactKeysToFetch = [ CNContactFormatter.descriptorForRequiredKeysForStyle(.FullName) ] + CNContact.requiredKeysForLifetime

    private func loadContacts(filteredBy searchTerm: String? = nil) {
        guard let contactStore = contactStore else {
            contacts = []
            return
        }
        if let searchTerm = searchTerm where !searchTerm.isEmpty {
            contacts = (try? contactStore.unifiedContactsMatchingPredicate(CNContact.predicateForContactsMatchingName(searchTerm), keysToFetch: self.requiredContactKeysToFetch)) ?? []
        } else {
            let containers = (try? contactStore.containersMatchingPredicate(nil)) ?? []
            contacts = containers.map({ CNContact.predicateForContactsInContainerWithIdentifier($0.identifier) }).flatMap({ (try? contactStore.unifiedContactsMatchingPredicate($0, keysToFetch: self.requiredContactKeysToFetch)) ?? [] })
        }
    }


    // MARK: Search Controller

    private lazy var searchController: UISearchController = {
        let searchController = UISearchController(searchResultsController: nil)
        searchController.dimsBackgroundDuringPresentation = false
        searchController.obscuresBackgroundDuringPresentation = false
        searchController.searchResultsUpdater = self
        self.definesPresentationContext = true
        return searchController
    }()


    // MARK: Lifecycle

    override func viewDidLoad() {
        super.viewDidLoad()
        tableView.tableHeaderView = searchController.searchBar
    }


    // MARK: User Interaction

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        switch segue.identifier! {

        case "showContactDetail":
            guard let indexPath = self.tableView.indexPathForSelectedRow else {break}
            let contact = contacts[indexPath.row]
            let contactDetailViewController = segue.destinationViewController as! ContactDetailViewController
            contactDetailViewController.contact = contact

        default:
            break
        }
    }
}


// MARK: - Table View Datasource

// TODO: implement UITableViewDatasource protocol

extension ContactListViewController {

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return 1
    }

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return contacts.count
    }

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCellWithIdentifier("LifetimeCell", forIndexPath: indexPath) as! LifetimeCell
        let contact = contacts[indexPath.row]
        cell.configureForContact(contact)
        if contact.lifetime != nil {
            cell.selectionStyle = .Default
            cell.accessoryType = .DisclosureIndicator
        } else {
            cell.selectionStyle = .None
            cell.accessoryType = .None
        }
        return cell
    }
}

// MARK: - Search Results Updating

extension ContactListViewController: UISearchResultsUpdating {

    func updateSearchResultsForSearchController(searchController: UISearchController) {
        if let searchTerm = searchController.searchBar.text where !searchTerm.isEmpty {
            loadContacts(filteredBy: searchTerm)
        } else {
            loadContacts(filteredBy: nil)
        }
    }

}