can you check what's wrong with my codes? I can successfully run the application but with empty content. Thanks!
import Cocoa
class MainViewController: NSViewController {
#IBOutlet weak var scrollView: NSScrollView!
#IBOutlet weak var collectionView: NSCollectionView!
override func viewDidLoad() {
super.viewDidLoad()
// Do view setup here.
self.initView()
self.initCollectionView()
}
func initView() {
let nib = NSNib(nibNamed: NSNib.Name(rawValue: "NavCollectionViewCell"), bundle: nil)
//ßßself.collectionView.register(nib, forItemWithIdentifier: NSUserInterfaceItemIdentifier(rawValue: "NavCollectionViewCell"))
self.collectionView.register(nib, forItemWithIdentifier: .collectionViewItem)
}
func initCollectionView() {
self.collectionView.delegate = self
self.collectionView.dataSource = self
}
}
extension MainViewController: NSCollectionViewDelegate, NSCollectionViewDataSource {
func collectionView(_ collectionView: NSCollectionView, numberOfItemsInSection section: Int) -> Int {
return 3
}
func numberOfSections(in collectionView: NSCollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: NSCollectionView, itemForRepresentedObjectAt indexPath: IndexPath) -> NSCollectionViewItem {
// 4
let item = collectionView.makeItem(withIdentifier: .collectionViewItem, for: indexPath)
return item
}
}
extension NSUserInterfaceItemIdentifier {
static let collectionViewItem = NSUserInterfaceItemIdentifier("NavCollectionViewCell")
}
Related
I have a UICollectionView placed inside a UITableViewCell. The collection view has its scroll direction set to horizontal. However, when I swipe left or right on it to try and scroll, it doesn't work. Instead the table view cell is just pressed. It seems like the table view is eating up the gesture and not allowing the collection view to register it.
How can I make it so the collection view can scroll left and right with horizontal swipes, while still allowing the parent table view to scroll vertically?
Image that I want to the first cell to have a collection view of images horizontally and on the other cells rows of names for example .
you can see my project on this GitHub account : https://github.com/BenSeferidis/Nft-Assets/tree/version4 for better understanding .
the code is the following :
LobbyViewController (Main VC):
import UIKit
class LobbyViewController: UIViewController {
// MARK: - IBProperties
#IBOutlet weak var tableView: UITableView!
// MARK: - Properties
var data: [DataEnum] = []
var likes:[Int] = []
var numlikes: Int = 0
var nfts: [Nft] = []
let creators : [Creator] = []
var icons: [Icon] = []
var loadData = APICaller()
// MARK: - Life Cyrcle
override func viewDidLoad() {
super.viewDidLoad()
let nib = UINib(nibName: "AssetTableViewCell", bundle: nil)
tableView.register(nib, forCellReuseIdentifier: "AssetTableViewCell")
let nib2 = UINib(nibName: "CreatorsTableViewCell", bundle: nil)
tableView.register(nib2, forCellReuseIdentifier: "CreatorsTableViewCell")
tableView.dataSource = self //method to generate cells,header and footer before they are displaying
tableView.delegate = self //method to provide information about these cells, header and footer ....
downloadJSON {
self.tableView.reloadData()
print("success")
}
loadData.downloadData { (result) in
print(result)
}
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let destination = segue.destination as? PresentViewController {
destination.nft = nfts[tableView.indexPathForSelectedRow!.row]
destination.delegate = self
}
}
// MARK: - Methods
func downloadJSON(completed: #escaping () -> ()) {
let url = URL(string: "https://public.arx.net/~chris2/nfts.json")
URLSession.shared.dataTask(with: url!) { [self] data, response, error in
if error == nil {
do {
self.nfts = try JSONDecoder().decode([Nft].self, from: data!)
nfts.forEach { nft in
let creators = nfts.map (\.creator)
self.data.append(.type1(creators: creators))
}
self.nfts.forEach { nft in
self.data.append(.type2(nft: nft))
}
DispatchQueue.main.async {
completed()
}
}
catch {
print("error fetching data from api")
}
}
}.resume()
}
}
// MARK: - Extensions
extension LobbyViewController : UITableViewDelegate , UITableViewDataSource {
func numberOfSections(in tableView: UITableView) -> Int {
return 2
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return data.count
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
indexPath.row == 0 ? 100 : UITableView.automaticDimension
}
//gemizo ta rows tou table
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
switch self.data[indexPath.item] {
case .type1(let creators):
let cell = tableView.dequeueReusableCell(withIdentifier: "CreatorsTableViewCell",
for: indexPath) as! CreatorsTableViewCell
//cell.creatorsCollectionView = self
return cell
case .type2(let nft):
let cell = tableView.dequeueReusableCell(withIdentifier: "AssetTableViewCell",
for: indexPath) as! AssetTableViewCell
cell.nameLabel?.text = nft.name
cell.nameLabel.layer.cornerRadius = cell.nameLabel.frame.height/2
cell.likesLabel?.text = "\((numlikes))"
let imgUrl = (nft.image_url)
print(imgUrl)
cell.iconView.downloaded(from: imgUrl)
cell.iconView.layer.cornerRadius = cell.iconView.frame.height/2
return cell
}
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
performSegue(withIdentifier: "showDetails", sender: self)
}
}
extension LobbyViewController : TestDelegate{
func sendBackTheLikess(int: Int) {
numlikes = int
tableView.reloadData()
}
}
// MARK: - Enums
enum DataEnum {
case type1(creators: [Creator])
case type2(nft: Nft)
}
// MARK: - Struct
struct Constants {
static let url = "https://public.arx.net/~chris2/nfts.json"
}
Creators TableViewCell :
import UIKit
class CreatorsTableViewCell: UITableViewCell {
//MARK: - IBProtperties
#IBOutlet var creatorsCollectionView: UICollectionView!
#IBOutlet var creatorsLbl: UILabel!
//MARK: - Properties
var nft : Nft?
var creators : [Creator] = []
var users: User?
weak var delegate : CreatorsTableViewCellDelegate?
//MARK: - Life Cyrcle
override func awakeFromNib() {
super.awakeFromNib()
creatorsCollectionView.dataSource = self
creatorsCollectionView.delegate = self
let nibName = UINib(nibName: "CollectionViewCell", bundle: nil)
creatorsCollectionView.register(nibName, forCellWithReuseIdentifier: "CollectionViewCell")
creatorsCollectionView.horizontalScrollIndicatorInsets
}
//init
override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .horizontal
layout.itemSize = CGSize(width: 10 , height: 10)
layout.sectionInset = UIEdgeInsets(top: 3, left: 3, bottom: 3, right: 3)
super.init(style: style, reuseIdentifier: reuseIdentifier)
creatorsCollectionView.showsHorizontalScrollIndicator = true
creatorsCollectionView.showsVerticalScrollIndicator = false
}
required init?(coder aDecoder : NSCoder) {
super.init(coder: aDecoder)
}
func setUpCollection(creators: Creator) {
creatorsLbl.text = creators.user.username
}
}
//MARK: - Extensions
extension CreatorsTableViewCell : UICollectionViewDelegate , UICollectionViewDataSource , UICollectionViewDelegateFlowLayout{
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return creators.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = creatorsCollectionView.dequeueReusableCell(withReuseIdentifier: "CollectionViewCell",
for: indexPath) as! CollectionViewCell
// cell.setUpCollectionViewCell((nft?.creator.profileImgURL[indexPath.row])!)
return cell
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
collectionView.deselectItem(at: indexPath, animated:true)
}
}
//MARK: - Protocols
protocol CreatorsTableViewCellDelegate: AnyObject {
func didSelectPhoto(index: Int)
}
CollectionViewController :
import UIKit
private let reuseIdentifier = "Cell"
class CollectionViewController: UICollectionViewController , UICollectionViewDelegateFlowLayout {
let creatorsCellId = "creatorsCellId"
override func viewDidLoad() {
super.viewDidLoad()
setupCollectionView()
// self.collectionView!.register(UICollectionViewCell.self, forCellWithReuseIdentifier: reuseIdentifier)
func setupCollectionView() {
collectionView?.showsHorizontalScrollIndicator = false
collectionView?.backgroundColor = .lightGray
let nib = UINib(nibName: "CollectionViewCell", bundle: nil)
collectionView?.register(nib, forCellWithReuseIdentifier: creatorsCellId)
collectionView?.register(CollectionViewCell.self, forCellWithReuseIdentifier: "cellId")
}
}
}
extension CollectionViewController {
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 7
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: creatorsCellId, for: indexPath) as! CollectionViewCell
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: 180, height: view.frame.height-60)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsets(top: 0, left: 10, bottom: 0, right: 10)
}
}
CollcetionViewCell:
import UIKit
class CollectionViewCell: UICollectionViewCell {
//MARK: - IBProperties
#IBOutlet var creatorsImg: UIImageView!{
didSet {
creatorsImg.contentMode = .scaleAspectFit
}
}
//MARK: - Properties
var nft : Nft?
//MARK: - Life Cyrcle
override func awakeFromNib() {
super.awakeFromNib()
}
func setUpCollectionViewCell(_ nft: Nft) {
let imgUrl = (nft.creator.profileImgURL)
print(imgUrl)
creatorsImg.downloaded(from: imgUrl)
// creatorsImg.image = UIImage(named: (nft.creator.profileImgURL))
creatorsImg.layoutIfNeeded()
creatorsImg.layer.cornerRadius = creatorsImg.frame.height / 2
}
}
the results is this :
I am trying this for a couple of days now and haven't achieved anything yet. What I am trying to do is when a user picks a User item form the ViewController class, I want to save it in Realm and show it in the CollectionView of the SavedInterestsViewController class. I use a delegate pattern as suggested in this post How to access and refresh a UITableView from another class in Swift, but unfortunately I still receive nil, I guess because the GC removed the collectionView outlet already right? (please correct me if I misunderstood it). However, how can I get this to work by using a delegate pattern? Here is my code, this is the class where the user Picks a new User-item:
protocol ViewControllerDelegate {
func didUpdate(sender: ViewController)
}
class ViewController: UIViewController {
#IBOutlet weak var searchBar: UISearchBar!
#IBOutlet weak var collectionView: UICollectionView!
var delegate: ViewControllerDelegate?
let numberOfTweets = 5
let realm = try! Realm()
var image = UIImage()
var imageArray: [String] = []
var userArray: [User] = []
override func viewDidLoad() {
super.viewDidLoad()
collectionView.delegate = self
collectionView.dataSource = self
collectionView.register(UINib(nibName: "CollectionViewCell", bundle: nil), forCellWithReuseIdentifier: "CollectionCell")
searchBar.delegate = self
}
}
extension ViewController: UISearchBarDelegate {
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
print("One second...")
let functionClass = NetworkingFunctions()
var loopCount = 0
functionClass.getWikipediaAssumptions(for: searchBar.text!) { [self] (articleArray) in
self.userArray.removeAll()
for x in articleArray {
functionClass.performWikipediaSearch(with: x, language: WikipediaLanguage("en")) { (user) in
self.userArray.append(user)
collectionView.reloadData()
loopCount += 1
}
}
}
}
}
extension ViewController: UICollectionViewDelegate, UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return userArray.count
}
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CollectionCell", for: indexPath) as! CollectionViewCell
let image = UIImage.init(data: userArray[indexPath.item].image as Data)
cell.userImage.image = image
cell.nameLabel.text = userArray[indexPath.item].name
cell.userImage.layer.borderColor = image?.averageColor?.cgColor
if userArray[indexPath.item].checked == false {
cell.checkmark.isHidden = true
} else {
cell.checkmark.isHidden = false
}
return cell
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
if userArray[indexPath.item].checked == false {
userArray[indexPath.item].checked = true
collectionView.reloadData()
let newUser = User()
newUser.image = userArray[indexPath.item].image
newUser.name = userArray[indexPath.item].name
newUser.checked = true
try! realm.write {
realm.add(newUser)
}
self.delegate = SavedInterestsViewController()
self.delegate?.didUpdate(sender: self)
}
else {
userArray[indexPath.item].checked = false
collectionView.reloadData()
}
}
}
extension ViewController: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let width = UIScreen.main.bounds.width/3 - 10
let height = width
return CGSize(width: width, height: height)
}
}
class User: Object {
#objc dynamic var image: NSData = NSData()
#objc dynamic var name: String = ""
#objc dynamic var checked: Bool = false
}
... and this is the class where I want to show the selected item, after the User clicked on the 'Back' Button of the navigation controller of the ViewController class:
class SavedInterestsViewController: UIViewController, ViewControllerDelegate {
func didUpdate(sender: ViewController) {
DispatchQueue.main.async {
self.collectionView.reloadData()
}
}
#IBOutlet weak var addButton: UIBarButtonItem!
#IBOutlet weak var collectionView: UICollectionView!
let realm = try! Realm()
var userArray: [User] = []
override func viewDidLoad() {
super.viewDidLoad()
collectionView.delegate = self
collectionView.dataSource = self
collectionView.register(UINib(nibName: "CollectionViewCell", bundle: nil), forCellWithReuseIdentifier: "CollectionCell")
fetchDataFromRealm()
}
#IBAction func addButtonPressed(_ sender: UIBarButtonItem) {
performSegue(withIdentifier: "SavedToNew", sender: self)
}
func fetchDataFromRealm() {
userArray.append(contentsOf: realm.objects(User.self))
collectionView.reloadData()
}
}
extension SavedInterestsViewController: UICollectionViewDelegate, UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return userArray.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CollectionCell", for: indexPath) as! CollectionViewCell
let image = UIImage.init(data: userArray[indexPath.item].image as Data)
cell.userImage.image = image
cell.nameLabel.text = userArray[indexPath.item].name
cell.userImage.layer.borderColor = image?.averageColor?.cgColor
if userArray[indexPath.item].checked == false {
cell.checkmark.isHidden = true
} else {
cell.checkmark.isHidden = false
}
return cell
}
}
extension SavedInterestsViewController: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let width = UIScreen.main.bounds.width/3 - 10
let height = width
return CGSize(width: width, height: height)
}
}
in your code you have lines
self.delegate = SavedInterestsViewController()
self.delegate?.didUpdate(sender: self)
but it do mostly nothing - you set the delegate to newly created class, didUpdate it - but I don't see any use of it - you don't present it in any way.
If I understand you right - you have SavedInterestsViewController, from it - you open ViewController, do something and when back to SavedInterestsViewController. (I can be wrong with your flow - correct me if so)
In this flow - you have delegate property in ViewController, but it must be of type SavedInterestsViewController. And you have to set it to SavedInterestsViewController when you open ViewController from it. And later in ViewController you have to call didUpdate method of delegate.
I use a UITabBarController to manage the large middle button on the UITabBar. Here is a part of it.
class TabBarController: UITabBarController, UITabBarControllerDelegate, ContentChangedDelegate {
override func viewDidLoad() {
super.viewDidLoad()
setupMiddleButton()
}
func setupMiddleButton() {
let tabBarHeight = tabBar.frame.size.height
let menuButton = UIButton(frame: CGRect(x: 0, y: 0, width: tabBarHeight*1.5, height: tabBarHeight*1.5))
var menuButtonFrame = menuButton.frame
menuButtonFrame.origin.y = view.bounds.height - menuButtonFrame.height/2 - tabBarHeight - 8
menuButtonFrame.origin.x = view.bounds.width/2 - menuButtonFrame.size.width/2
menuButton.frame = menuButtonFrame
menuButton.backgroundColor = UIColor.red
menuButton.layer.cornerRadius = menuButtonFrame.height/2
view.addSubview(menuButton)
let largeConfiguration = UIImage.SymbolConfiguration(scale: .large)
let addIcon = UIImage(systemName: "plus", withConfiguration: largeConfiguration)
menuButton.setImage((addIcon), for: .normal)
menuButton.addTarget(self, action: #selector(menuButtonAction(sender:)), for: .touchUpInside)
view.layoutIfNeeded()
}
#objc private func menuButtonAction(sender: UIButton) {
AddViewController.delegate = self
performSegue(withIdentifier: "addEventSegue", sender: self)
}
}
and I conform another class LifeViewController(I used the class the specify the collecitonView and searchbar and other items in it) to tabBarController but the lifeCollectionView is always nil when implicitly unwrap, Could any one help me, Thank you so much!
class LifeViewController: TabBarController {
let realm = try! Realm()
var reminders : Results<Memorandum>!
let tabBarView = TabBarController()
#IBOutlet weak var searchBar: UISearchBar!
#IBOutlet var lifeCollectionView: UICollectionView!
override func viewDidLoad() {
super.viewDidLoad()
self.fetchData()
lifeCollectionView.delegate = self
lifeCollectionView.dataSource = self
// Do any additional setup after loading the view.
}
override func viewWillAppear(_ animated: Bool) {
self.fetchData()
}
override func reloadCollection() {
if let life = self.lifeCollectionView {
life.reloadData()
} else {
print("life found nil")
}
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
performSegue(withIdentifier: "editing", sender: self)
}
func fetchData() {
reminders = realm.objects(Memorandum.self)
}
}
//MARK: - CollectionView
extension LifeViewController {
override func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: lifeCollectionView.frame.width/2.1, height: lifeCollectionView.frame.width/2.1)
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return reminders.count
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let reminder = reminders[indexPath.item]
let lifeCell = lifeCollectionView.dequeueReusableCell(withReuseIdentifier: "lifeCell", for: indexPath) as! ReminderCell
lifeCell.configureCell(date: reminder.dateReminder, importance: UIColor(hex: reminder.color)!, name: reminder.title, depict: reminder.depiction)
lifeCell.layer.cornerRadius = 12
return lifeCell
}
}
But when I change back to conform the LifeViewController to UIViewController, and other collection view protocols the IBOutlet, delegate and dataSource work again? Why is that?
I want to make things like this.
(1). if I press one of that button(A) among 31. that number(A) turn red.
(2). then if I press another button(B) then (A) turn black again and then (B) turn red.
**
class ViewController: UICollectionViewController {
var collectionViewCell = CollectionViewCell()
let data = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31]
override func viewDidLoad() {
super.viewDidLoad()
collectionView.register(UINib(nibName: "CollectionViewCell", bundle: nil), forCellWithReuseIdentifier : "MyCell")
}
override func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return data.count
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "MyCell", for: indexPath) as! CollectionViewCell
cell.Label.text = String(data[indexPath.row])
return cell
}
}
class CollectionViewCell: UICollectionViewCell {
#IBOutlet weak var Label: UILabel!
#IBOutlet weak var button: UIButton!
#IBAction func buttonPressed(_ sender: UIButton) {
if Label.textColor == .red{
Label.textColor = .black
} else if Label.textColor == .black{
Label.textColor = .red
}
}
public override func awakeFromNib() {
super.awakeFromNib()
}
}
You have to use isSelected and func setSelected(_ selected: Bool, animated: Bool) {
But first you need to know that in Swift we use camelCase styling for variables.
Now we would have to change a little bit your cell implementation:
class CollectionViewCell: UICollectionViewCell {
#IBOutlet weak var label: UILabel!
#IBOutlet weak var button: UIButton!
public override func awakeFromNib() {
super.awakeFromNib()
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
if selected {
label.textColor = .red
} else {
label.textColor = .black
}
}
#IBAction func buttonPressed(_ sender: UIButton) {
self.isSelected = !self.isSelected
}
}
Also don't forget to update cell.Label.text = String(data[indexPath.row]) to cell.label.text = String(data[indexPath.row])
EDIT
As Leo Darbus pointed out it would be better to use isSelected.toggle() than self.isSelected = !self.isSelected, since it's already provided by system
You have to save the row number of the selected cell in the view controller.
Rather than modifying the color in the cell add a callback closure. In cellForRow handle the callback to set the current row to red and the previous row to black by reloading the row.
Something like this
class ViewController: UICollectionViewController {
var selectedRow : Int?
let data = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31]
override func viewDidLoad() {
super.viewDidLoad()
collectionView.register(UINib(nibName: "CollectionViewCell", bundle: nil), forCellWithReuseIdentifier : "MyCell")
}
override func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return data.count
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "MyCell", for: indexPath) as! CollectionViewCell
cell.Label.textColor = indexPath.item == selectedRow ? .red : .black
cell.callback = { [unowned self] in
if let row = self.selectedRow {
self.selectedRow = indexPath.item
collectionView.reloadItems(at: [IndexPath(item: row, section: 0)])
}
cell.Label.textColor = .red
}
cell.Label.text = String(data[indexPath.row])
return cell
}
}
class CollectionViewCell: UICollectionViewCell {
#IBOutlet weak var Label: UILabel!
#IBOutlet weak var button: UIButton!
var callback : (() -> Void)?
#IBAction func buttonPressed(_ sender: UIButton) {
callback?()
}
}
In the Storyboard:
The datasource and delegate are connected from the LFCollectionView to the LFCollectionViewController. The reuseIdentifier is set to LFCell in the CollectionViewCell. The label inside the CollectionViewCell is named cellLabel and has an outlet to my custom LFCollectionViewCell. I want the outlet cellLabel to display the elements in my array of strings lFContainerLabel within each cell container in the collection. I am missing something, or going about this all wrong. I do not have a nib. I don't know how to use those. Is a nib a must in this scenario?
import UIKit
var lFContainerLabel: [String] = []
private let reuseIdentifier = "LFCell"
class LFCollectionView: UICollectionView { }
class LFNavigationController: UINavigationController { }
class LFCollectionViewCell: UICollectionViewCell {
#IBOutlet weak var cellLabel: UILabel!
}
class LFCollectionViewController: UICollectionViewController,UICollectionViewDelegateFlowLayout {
override func viewDidLoad() {
super.viewDidLoad()
self.collectionView!.register(LFCollectionViewCell.self, forCellWithReuseIdentifier: reuseIdentifier)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func numberOfSections(in LFCollectionViewController: UICollectionView) -> Int {
return 1
}
override func collectionView(_ LFCollectionViewController: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return lFContainerLabel.count
}
override func collectionView(_ LFCollectionViewController: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let lFCell = LFCollectionViewController.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath) as UICollectionViewCell!
var myIndex: Int = 0
lFCell?.backgroundColor = UIColor.black
lFCell?.accessibilityElements = lFContainerLabel
myIndex = indexPath.item
lFCell?.cellLabel?.text = lFContainerLabel[myIndex]
return lFCell!
}
}