ManagingContacts/ManagingContacts/UpdateContactViewController.swift

/*
    Copyright (C) 2017 Apple Inc. All Rights Reserved.
    See LICENSE.txt for this sample’s licensing information
    
    Abstract:
    A table view controller that allows you to update the following 
                properties of an existing contact: profile picture's thumbnail, 
                first name, last name, organization name, email, phone number, 
                and postal address (street, city, state, country, and zip code).
*/
 
import UIKit
 
class UpdateContactViewController: UITableViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate, UITextFieldDelegate {
    // MARK: - Properties
    
    @IBOutlet weak fileprivate var profileImage: UIImageView!
    @IBOutlet weak fileprivate var firstName: UITextField!
    @IBOutlet weak fileprivate var lastName: UITextField!
    @IBOutlet weak fileprivate var organization: UITextField!
    
    @IBOutlet weak fileprivate var lblEmail: UILabel!
    @IBOutlet weak fileprivate var email: UITextField!
    @IBOutlet weak fileprivate var lblPhoneNumber: UILabel!
    @IBOutlet weak fileprivate var phoneNumber: UITextField!
 
    @IBOutlet weak fileprivate var street: UITextField!
    @IBOutlet weak fileprivate var city: UITextField!
    @IBOutlet weak fileprivate var state: UITextField!
    @IBOutlet weak fileprivate var country: UITextField!
    @IBOutlet weak fileprivate var zipCode: UITextField!
    
    /**
        - returns: A model object representing a CNContact object. Contains
                   information to be updated.
    */
    var contact: MGCContact!
    
    /// Indicates whether the user has selected a profile picture for their contact.
    fileprivate var didSelectPicture: Bool?
    
    // MARK: - View Life Cycle
    
    override func viewDidLoad() {
        super.viewDidLoad()
        configureView(withContact: contact)
    }
    
    
    // MARK: - Update UI
    
    /// Update the UI with the provided contact information.
    fileprivate func configureView(withContact contact: MGCContact) {
        // Update the profile image if the provided contact's imageData exists.
        if let withProfilePicture = contact.profilePicture, let imageData = withProfilePicture.imageData {
            profileImage.image = UIImage(data: imageData as Data)
        }
        
        // Update the name textfields.
        firstName.text = contact.firstName
        lastName.text = contact.lastName
        organization.text = contact.organization
 
        
        // Update the email textfield and its matching label.
        if let withEmail = contact.email {
            
            lblEmail.text = withEmail.label
            email.text = withEmail.value
        }
        
        // Update the phone number field and its matching label.
        if let withPhoneNumber = contact.phoneNumber {
            
            lblPhoneNumber.text = withPhoneNumber.label
            phoneNumber.text = withPhoneNumber.value
        }
        
        // Update the postal address fields.
        if let withPostalAddress = contact.postalAddress {
            
            let postalAddress = withPostalAddress.address
            street.text = postalAddress!.street
            city.text = postalAddress!.city
            state.text = postalAddress!.state
            zipCode.text = postalAddress!.postalCode
            country.text = postalAddress!.country
        }
    }
 
    
    // MARK: - UITextFieldDelegate
    
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
         textField.resignFirstResponder()
        
        // Enable Save in the navigation bar when textField has a value.
        navigationItem.rightBarButtonItem!.isEnabled = !(textField.text!.isEmpty)
        return true
    }
    
    func textFieldDidBeginEditing(_ textField: UITextField) {
        // Disable Save anytime the user is editing a textfield.
        navigationItem.rightBarButtonItem!.isEnabled = false
    }
    
    
    // MARK: - UIImagePickerControllerDelegate
    
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        // Dismiss the picker if the user canceled the operation.
        dismiss(animated: true, completion: nil)
    }
    
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        /* The info dictionary contains multiple representations of the image. 
           Let's use the original one.
        */
        guard let selectedImage = info[UIImagePickerControllerOriginalImage] as? UIImage else { return }
        
        // Set profileImage to display the selected image.
        profileImage.image = selectedImage
        
        /* profilePicture is set to defaultPhoto, by default. When the user
           selects a picture from the Photo library, we replace defaultPhoto
           with it and set didSelectPicture to true.
        */
        didSelectPicture = true
        
        // Also enable Save the navigation bar when the user has selected an image.
        navigationItem.rightBarButtonItem!.isEnabled = true
    
        // Dismiss the picker.
        dismiss(animated: true, completion: nil)
    }
    
    
    // MARK: - Select a Profile Picture
    
    /// Allows the user to select a profile picture for their contact.
    @IBAction fileprivate func selectProfilePicture(_ sender: UITapGestureRecognizer) {
        /* UIImagePickerController is a view controller that lets a user pick
           media from their photo library.
        */
        let imagePickerController = UIImagePickerController()
        
        // Only allow photos to be picked, not taken.
        imagePickerController.sourceType = .photoLibrary
        
        // Make sure ViewController is notified when the user picks an image.
        imagePickerController.delegate = self
        
        present(imagePickerController, animated: true, completion: nil)
    }
    
 
    // MARK: - Navigation
    
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        /* Fetch and send back all entered values after the user has tapped
           Save in the navigation bar.
        */
        if navigationItem.rightBarButtonItem == sender as? UIBarButtonItem {
            
            if let image = profileImage.image, let imgData = UIImagePNGRepresentation(image), let _ = self.didSelectPicture {
                contact.profilePicture = MGCLabelValue(imageData: imgData)
            }
            
            contact.firstName = firstName.text!
            contact.lastName = lastName.text!
            contact.organization = organization.text!
            
            contact.email = MGCLabelValue(label: lblEmail.text!, value: email.text!)
            contact.phoneNumber = MGCLabelValue(label: lblPhoneNumber.text!, value: phoneNumber.text!)
            
            let postalAddress = MGCPostalAddress(street: street.text!, city: city.text!, state: state.text!, postalCode: zipCode.text!, country: country.text!)
            if let currentPostalAddress = contact.postalAddress {
                contact.postalAddress = MGCLabelValue(label: currentPostalAddress.label, address: postalAddress)
            }
            else {
                contact.postalAddress = MGCLabelValue(address: postalAddress)
            }
        }
    }
 
    
    // MARK: - Memory Management
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}


Copyright © 2017 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2017-02-11