Pass Data between xib files without storyboard in Swift3 - ios

Question

I am new to swift (and new to StackOverflow) and learning to use nib files now as I did quite a bit of learning with storyboard already.
In storyboard we can instantiate segues and unwindSegues to fetch data from one VC to another. How can I do the same WITHOUT using storyboard?
I currently have a scrollview(MainViewController.xib) that loads a tableview(ContactView.xib) on it. I have an add button overlaying the tableview which is currently unresponsive.
I want to be able to load another view (AddContact.xib) when I click on the add button to add a new data to my tableview and then unwind to reflect the new data in the table, but WITHOUT using storyboard.
I can provide my code if needed, but am only looking for someone to point me in the correct direction. I know this can be achieved using Navigation Controllers but I can't seem to find a fitting tutorial for it (most are old and use Obj-C. I am unfamiliar with Obj-C).
I even looked at some similar questions like: this and this
but they failed to answer my question.
Any help is appreciated. Thank you.
My AppDelegate:
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
var mainVC: MainViewController? = nil
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
mainVC = MainViewController(nibName: "MainViewController", bundle: nil)
let frame = UIScreen.main.bounds
window = UIWindow(frame: frame)
window!.rootViewController = mainVC
window!.makeKeyAndVisible()
return true
}
MainViewController.swift:
class MainViewController: UIViewController {
#IBOutlet weak var scrollView: UIScrollView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
let contactView: ContactView = ContactView(nibName: "ContactView", bundle: nil)
let dialerView: DialerView = DialerView(nibName: "DialerView", bundle: nil)
self.addChildViewController(dialerView)
self.scrollView.addSubview(dialerView.view)
dialerView.didMove(toParentViewController: self)
self.addChildViewController(contactView)
self.scrollView.addSubview(contactView.view)
contactView.didMove(toParentViewController: self)
var contactViewFrame : CGRect = contactView.view.frame
contactViewFrame.origin.x = self.view.frame.width
contactView.view.frame = contactViewFrame
self.scrollView.contentSize = CGSize(width: self.view.frame.width * 2, height: self.view.frame.height)
}
}
My ContactView.xib:
class ContactView: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var searchBar: UISearchBar!
var names = ["Rohan", "Rahul", "Sneh", "Paa", "Maa", "Vatsal", "Manmohan"]
var numbers = ["9830000001", "9830000002", "9830000003", "9830000004", "9830000005", "9830000006", "9830000007"]
let navVC: UINavigationController? = nil
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return names.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
tableView.rowHeight = CGFloat(60)
tableView.register(UINib(nibName: "ContactCell", bundle: nil), forCellReuseIdentifier: "Contact")
let cell = tableView.dequeueReusableCell(withIdentifier: "Contact", for: indexPath) as! ContactCell
cell.nameLabel.text = names[indexPath.row]
cell.numLabel.text = numbers[indexPath.row]
return cell
}
// Make delete-able in scroll view
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == UITableViewCellEditingStyle.delete {
names.remove(at: indexPath.row)
numbers.remove(at: indexPath.row)
tableView.reloadData()
}
}
My AddContact.xib only has the outlets defined.
Edit: I found a solution thanks to the commenters.
To Anyone wondering how I did it, I'll post the steps below:
Step 1: Create a protocol (I did so in my MainViewController.xib)
protocol NewContactDelegate {
func add_Contact (name: String, num: String)
}
Step 2: Instantiate a delegate for it in the senderVC. AddContact.xib was the senderVC for me
class AddContact: UIViewController {
var delegate: NewContactDelegate? = nil
#IBOutlet weak var nameField: UITextField!
#IBOutlet weak var numField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func saveContact(_ sender: UIButton) {
if delegate != nil {
if let name = nameField?.text, let num = numField?.text {
delegate?.add_Contact(name: name, num: num)
dismiss(animated: true, completion: nil)
}
}
}
Step 3: Make ReceivingVC conform to the delegate and accept data.
class ContactView: ....., NewContactDelegate {
func add_Contact(name: String, num: String) {
names.append(name)
numbers.append(num)
addressBook.reloadData() // This is my TableView outlet
}
}
**
NOTE: Remember to assert the delegate to a non-nil value in the RecievingVC to make sure #IBAction in SenderVC works as expected.
**