How to define dynamic heights for UICollectionViewCells with a TextView inside - ios

Question

This is a popular question but I'm still not able to find a simple answer of how to define a dynamic height for a UICollectionViewCell with a TextView inside. I found this answer UICollectionView - dynamic cell height? but I'm not using interface and I would like a solution for interfaces built in code.
import UIKit
class ResumeController : UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {
let cellId = "cellId"
lazy var collectionView: UICollectionView = {
let layout = UICollectionViewFlowLayout()
//layout.estimatedItemSize = CGSize(width: 100, height: 100)
layout.minimumLineSpacing = 0
let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
cv.backgroundColor = .white
cv.dataSource = self
cv.delegate = self
cv.translatesAutoresizingMaskIntoConstraints = false
cv.register(FirmCell.self, forCellWithReuseIdentifier: self.cellId)
return cv
}()
override func viewDidLoad() {
view.backgroundColor = .white
setupViews()
}
func setupViews() {
setupCollectionView()
}
func setupCollectionView() {
view.addSubview(collectionView)
collectionView.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor).isActive = true
collectionView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
collectionView.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
collectionView.bottomAnchor.constraint(equalTo: bottomLayoutGuide.topAnchor).isActive = true
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 10
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath);
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: view.frame.width, height: 100.0)
}
}
class FirmCell : UICollectionViewCell {
let imageView: UIImageView = {
let iv = UIImageView()
iv.backgroundColor = .orange
// iv.image = somelogo
iv.contentMode = .scaleAspectFill
iv.clipsToBounds = true
iv.translatesAutoresizingMaskIntoConstraints = false
return iv
}()
lazy var textView: UITextView = {
let tv = UITextView()
tv.isEditable = false
tv.isSelectable = false
tv.isScrollEnabled = false
tv.attributedText = self.attributedText()
tv.translatesAutoresizingMaskIntoConstraints = false
tv.layer.borderWidth = 0.5
tv.layer.borderColor = UIColor.blue.cgColor
return tv
}()
let separatorLine: UIView = {
let view = UIView()
view.backgroundColor = UIColor(white: 0.9, alpha: 1)
view.translatesAutoresizingMaskIntoConstraints = false
return view
}()
func attributedText() -> NSAttributedString {
let text = NSMutableAttributedString()
// company
var companyAttr = [String: Any]()
companyAttr[NSFontAttributeName] = UIFont.systemFont(ofSize: 15, weight: UIFontWeightBold)
companyAttr[NSForegroundColorAttributeName] = UIColor.black
text.append(NSAttributedString(string: "line1" , attributes: companyAttr))
// period
var periodAttr = [String: Any]()
periodAttr[NSFontAttributeName] = UIFont.systemFont(ofSize: 14)
periodAttr[NSForegroundColorAttributeName] = UIColor.lightGray
text.append(NSAttributedString(string: " line1" , attributes: periodAttr))
// body
var bodyAttr = [String: Any]()
bodyAttr[NSFontAttributeName] = UIFont.systemFont(ofSize: 14, weight: UIFontWeightThin)
bodyAttr[NSForegroundColorAttributeName] = UIColor.black
text.append(NSAttributedString(string: "\na huge amount of text goes here ... trying to figure out a way to have different collectionview cells row height", attributes: bodyAttr))
return text
}
override init(frame: CGRect) {
super.init(frame: frame)
setupViews()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func setupViews() {
setupImageView()
}
func setupImageView() {
addSubview(imageView)
imageView.topAnchor.constraint(equalTo: topAnchor, constant: 9.0).isActive = true
imageView.leftAnchor.constraint(equalTo: leftAnchor, constant: 9.0).isActive = true
imageView.heightAnchor.constraint(equalToConstant: 40.0).isActive = true
imageView.widthAnchor.constraint(equalToConstant: 40.0).isActive = true
setupTextView()
}
func setupTextView() {
addSubview(textView)
textView.topAnchor.constraint(equalTo: imageView.topAnchor, constant: 0).isActive = true
textView.leftAnchor.constraint(equalTo: imageView.rightAnchor, constant: 7.0).isActive = true
textView.rightAnchor.constraint(equalTo: rightAnchor, constant: -9.0).isActive = true
textView.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
}
}
Could someone provide some pointers?