Unable to create cell in collectionview? - ios

Question

I want to add a UICollectionView inside a table view cell.For this purpose, i have created below files.
CollectionCell:
class CollectionCell: UICollectionViewCell {
#IBOutlet weak var lblName: UILabel!
#IBOutlet weak var imgCell: UIImageView!
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
}
I have also created a CollectionCell.xib
CollectionView.swift
class CollectionView: UIView {
#IBOutlet weak var collectionview: UICollectionView!
var arrItems:[String] = []
/*
// Only override draw() if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
override func draw(_ rect: CGRect) {
// Drawing code
}
*/
func configureCollectionView()
{
collectionview.register(CollectionCell.self, forCellWithReuseIdentifier: "CollectionCell")
collectionview.delegate = self
collectionview.dataSource = self
}
func setCollectionViewDatasource(arrItems:[String])
{
self.arrItems = arrItems
self.collectionview.reloadData()
}
static func initiateView()->CollectionView
{
let nib = UINib(nibName: "CollectionView", bundle: nil)
let view = nib.instantiate(withOwner: nil, options: nil)[0] as! CollectionView
return view
}
}
extension CollectionView:UICollectionViewDelegate
{
}
extension CollectionView:UICollectionViewDataSource
{
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return arrItems.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell:CollectionCell = collectionView.dequeueReusableCell(withReuseIdentifier: "CollectionCell", for: indexPath) as! CollectionCell
cell.lblName.text = arrItems[indexPath.row]
return cell
}
}
I have also created CollectionView.xib
Now as i want to add a collectionview inside a tableview cell for that purpose i have created a cutom tableview cell class as CustomTableCell
class CustomTableCell: UITableViewCell {
var view = CollectionView()
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
print("ceonstatructir init")
// insitate a nib
view = CollectionView.initiateView()
view.configureCollectionView()
contentView.addSubview(view)
view.setCollectionViewDatasource(arrItems: ["firest","second","thierd"])
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
func setDataSource(arrItems:[String])
{
//view.setCollectionViewDatasource(arrItems: arrItems)
}
}
Now i have created a mainViewController to show the data on tableview so i have crteated viewcontroller.swift
class ViewController: UIViewController,UITableViewDelegate,UITableViewDataSource {
#IBOutlet weak var tableview: UITableView!
let sectionArray = ["First","Second","Third","Fourth","Fifth"]
let collectionArray = [["First","Second","Third"],["First","Second","Third"],["First","Second","Third"],["First","Second","Third"],["First","Second","Third"]]
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
tableview.register(CustomTableCell.self, forCellReuseIdentifier: "TableCell")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func numberOfSections(in tableView: UITableView) -> Int {
return sectionArray.count
}
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
return sectionArray[section]
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 1
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell:CustomTableCell = tableView.dequeueReusableCell(withIdentifier: "TableCell", for: indexPath) as! CustomTableCell
return cell
}
func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
let cell:CustomTableCell = cell as! CustomTableCell
let dataSource = collectionArray[indexPath.section]
cell.setDataSource(arrItems:dataSource)
}
}
Now i am trying to send datasource to my collectionview when tableviewcell is just created.But i am getting crash in cellForItemAtIndexPath in collectionview.I am getting cell as nil in cellForItemAyIndexPath.Please tell me what is the issue with it.

Answer 1

In Collectionview.swift change this function
func configureCollectionView()
{
let nib = UINib(nibName: "CollectionCell", bundle: nil)
collectionview.register(nib, forCellWithReuseIdentifier: "cell")
collectionview.delegate = self
collectionview.dataSource = self
}
In cellforItemat change this line
let cell:CollectionCell = collectionView.dequeueReusableCell(withReuseIdentifier: "CollectionCell", for: indexPath) as! CollectionCell
to
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CollectionCell