Swift 3: How to get text from individual textfields that are in different collectionView cells? - swift

Question

I have a simple UICollectionView that has 3 cells. The cell has it's own class and all 3 cells use this class. The cell class just has a UITextField that is the cells size. I want to know how to be able to get hold of whatever is entered in each of the 3 cells UITextFields and pass it into my SecondController. How do I achieve this? Thank you guys. Code is below:
import UIKit
class FirstCell: BaseCell {
var secondController: SecondController?
let textField: UITextField = {
let tv = UITextField()
tv.textColor = .white
return tv
}()
override func setupViews() {
super.setupViews()
backgroundColor = .lightGray
addSubview(textField)
textField.frame = CGRect(x: 12, y: 0, width: self.frame.width, height: self.frame.height)
}
}
private let reuseIdentifier = "Cell"
class SecondController: UICollectionViewController, UICollectionViewDelegateFlowLayout {
override func viewDidLoad() {
super.viewDidLoad()
self.collectionView?.backgroundColor = .white
self.collectionView?.alwaysBounceVertical = true
self.collectionView?.register(FirstCell.self, forCellWithReuseIdentifier: reuseIdentifier)
self.navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Print", style: .plain, target: self, action: #selector(handlePrint))
}
func handlePrint() {
// print here...
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 3
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: view.frame.width, height: 50)
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath) as? FirstCell
cell?.secondController = self
if indexPath.item == 0 {
cell?.textField.placeholder = "First Textfield"
}
if indexPath.item == 1 {
cell?.textField.placeholder = "Second Textfield"
}
if indexPath.item == 2 {
cell?.textField.placeholder = "ThirdTextfield"
}
return cell!
}
}

Answer 1

create protocol
protocol MyCellTextFieldDelegate {
func didChangeTextTo(text: String)
}
then
extension SecondController: MyCellTextFieldDelegate {
func didChangeTextTo(text: String) {
//doStuff
}
}
inside your cell change
var secondController: SecondController?
to
weak var delegate: MyCellTextFieldDelegate?
and change your method to be like
override func setupViews() {
super.setupViews()
backgroundColor = .lightGray
addSubview(textField)
textField.delegate = self //this line
textField.addTarget(self, action: #selector(textFieldDidChange), for: .editingChanged) //and this line
textField.frame = CGRect(x: 12, y: 0, width: self.frame.width, height: self.frame.height)
}
and your cell class
class FirstCell: BaseCell, UITextFieldDelegate {
//other code
private func textFieldDidChange() {
self.delegate?.didChangeTextTo(text: (self.textField.text ?? ""))
}
}
and inside cellForItemAt
cell?.delegate = self
Edit: if you would like to get UICollectionViewCell that calls this, you should add
var tag: Int = 0
inside your cell and inside cellForItemAt
cell?.tag = indexPath.row
and then change your MyCellTextFieldDelegate func to pass not only text but tag as well.