how to add delegate method into stack view. please - ios

Question

I'm a junior developer in South Korea.
first of all, my English skill is not so good. I'm sorry.
I hava a question about UIViewController Delegate method
I just want to write featureList from UIViewController to UICollectionViewCell using FeatureDetailViewController
here my code
final class AppViewController: UIViewController {
private var featureList: [Feature] = []
private let scrollView = UIScrollView()
private let contentView = UIView()
private lazy var stackView: UIStackView = {
let stackView = UIStackView()
stackView.axis = .vertical
stackView.distribution = .equalSpacing
stackView.spacing = 0.0
let featureSectionView = FeatureSectionView(frame: .zero)
let rankingFeatureSectionView = RankingFeatureSectionView(frame: .zero)
let exchangeCodeButtonView = ExchangeCodeButtonView(frame: .zero)
let spacingView = UIView()
spacingView.snp.makeConstraints {
$0.height.equalTo(100.0)
}
[
featureSectionView,
rankingFeatureSectionView,
exchangeCodeButtonView,
spacingView
].forEach {
stackView.addArrangedSubview($0)
}
return stackView
}()
override func viewDidLoad() {
super.viewDidLoad()
view.addSubview(contentView)
setupNavigationController()
setupLayout()
}
}
private extension AppViewController {
func setupNavigationController() {
navigationItem.title = "앱"
navigationItem.largeTitleDisplayMode = .always
navigationController?.navigationBar.prefersLargeTitles = true
}
func setupLayout() {
view.addSubview(scrollView)
scrollView.snp.makeConstraints {
$0.top.equalTo(view.safeAreaLayoutGuide.snp.top)
$0.bottom.leading.trailing.equalToSuperview()
}
scrollView.addSubview(contentView)
contentView.snp.makeConstraints {
$0.edges.equalToSuperview()
$0.width.equalToSuperview()
}
contentView.addSubview(stackView)
stackView.snp.makeConstraints {
$0.edges.equalToSuperview()
}
}
}
I just want to present this FeatureDetailViewController when imageview is tapped which is in FeatureSectionCollectionViewCell
here is FeatureSectionCollectionViewCell
final class FeatureSectionCollectionViewCell: UICollectionViewCell {
private lazy var typeLabel: UILabel = {
let label = UILabel()
label.textColor = .systemBlue
label.font = .systemFont(ofSize: 12.0, weight: .semibold)
return label
}()
private lazy var appNameLabel: UILabel = {
let label = UILabel()
label.textColor = .label
label.font = .systemFont(ofSize: 20.0, weight: .bold)
return label
}()
private lazy var descriptionLabel: UILabel = {
let label = UILabel()
label.textColor = .secondaryLabel
label.font = .systemFont(ofSize: 16.0, weight: .semibold)
return label
}()
private lazy var imageview: UIImageView = {
let imageView = UIImageView()
imageView.layer.cornerRadius = 7.0
imageView.layer.borderWidth = 0.5
imageView.clipsToBounds = true
return imageView
}()
func setup(feature: Feature) {
setupLayout()
typeLabel.text = feature.type
appNameLabel.text = feature.appName
descriptionLabel.text = feature.description
imageview.backgroundColor = .lightGray
if let imageURL = URL(string: feature.imageURL) {
imageview.kf.setImage(with: imageURL)
}
}
}
private extension FeatureSectionCollectionViewCell {
func setupLayout() {
[
typeLabel,
appNameLabel,
descriptionLabel,
imageview
].forEach {
addSubview($0)
}
}
}
and UIView named as FeatureSectionView below
final class FeatureSectionView: UIView {
//data from plist
private var featureList: [Feature] = []
private lazy var collectionView: UICollectionView = {
let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .horizontal
let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
collectionView.delegate = self
collectionView.dataSource = self
collectionView.isPagingEnabled = true
collectionView.backgroundColor = .systemBackground
collectionView.showsHorizontalScrollIndicator = false
collectionView.register(
FeatureSectionCollectionViewCell.self,
forCellWithReuseIdentifier: "FeatureSectionCollectionViewCell"
)
return collectionView
}()
private let separatorView = SeparatorView(frame: .zero)
//FeatureSectionView이 UIView 이므로 ViewDidLoad에서 하지 않고 init 에서 실행
override init(frame: CGRect) {
super.init(frame: frame)
setupViews()
fetchData() //reloadData after read data
collectionView.reloadData()
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
extension FeatureSectionView: UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return featureList.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "FeatureSectionCollectionViewCell", for: indexPath) as? FeatureSectionCollectionViewCell
let feature = featureList[indexPath.row]
cell?.setup(feature: feature)
return cell ?? UICollectionViewCell()
}
}
extension FeatureSectionView : UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
CGSize(width: collectionView.frame.width - 32.0, height: frame.width)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
UIEdgeInsets(top: 0.0, left: 16.0, bottom: 0.0, right: 16.0)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 32.0
}
}
private extension FeatureSectionView {
func setupViews() {
[
collectionView,
separatorView
].forEach {
addSubview($0)
}
collectionView.snp.makeConstraints {
$0.leading.trailing.bottom.equalToSuperview()
$0.top.equalToSuperview().inset(16.0)
$0.height.equalTo(snp.width)
}
separatorView.snp.makeConstraints {
$0.leading.trailing.bottom.equalToSuperview()
$0.top.equalTo(collectionView.snp.bottom).offset(16.0)
}
}
func fetchData() {
guard let url = Bundle.main.url(forResource: "Feature", withExtension: "plist") else { return }
do {
let data = try Data(contentsOf: url)
let result = try PropertyListDecoder().decode([Feature].self, from: data)
featureList = result
} catch { }
}
}
HOW TO SET DELEGATE METHOD to presentation FeatureDetailViewController when imageview was tapped ?
I know it's hard to read, but I almost half-day-spent. please teach me guys.
thx

Answer 1

The delegate method would be useful if the user taps the cell in general; however, you want it to transition only when the imageView in the cell is tapped--from what I am understanding.
So, what you need to do is add a tapGestureRecognizer onto your imageView and perform the transition with a selector.
First create a method of the functionality that you want (this will be the selector)
#objc func imageWasTapped(tapGestureRecognizer: UITapGestureRecognizer) {
DispatchQueue.main.async {
//perform transition here
}
}
Add a tapGestureRecognizer to the imageView
private lazy var imageview: UIImageView = {
let imageView = UIImageView()
imageView.layer.cornerRadius = 7.0
imageView.layer.borderWidth = 0.5
imageView.clipsToBounds = true
//Make sure it can be touched
imageView.isUserInteractionEnabled = true
//Create the Gesture Recognizer and initialize it with the selector
let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(imageWasTapped(tapGestureRecognizer:)))
//add the Gesture Recognizer to the view
imageView.addGestureRecognizer(tapGestureRecognizer)
return imageView
}()