Insert Item in UICollectionView dynamically - ios

Question

I'm working on a requirement where I need to add the items in a UICollectionView dynamically.
Here is my code of ViewController
import UIKit
class ViewController: UIViewController {
enum Direction {
case Horizonatal
case Verticle
}
var enumDirection: Direction = .Verticle
var direction = "Verticle"
var SectionsAndRows = [Int]()
override func viewDidLoad() {
super.viewDidLoad()
SectionsAndRows.append(4)
SectionsAndRows.append(3)
SectionsAndRows.append(2)
SectionsAndRows.append(1)
//SectionsAndRows.append(5)
}
#IBOutlet var gridCollectionView: UICollectionView! {
didSet {
gridCollectionView.bounces = false
}
}
#IBOutlet var gridLayout: UICollectionViewFlowLayout! {
didSet {
//gridLayout.stickyRowsCount = 0
gridLayout.scrollDirection = .horizontal
//gridLayout.stickyColumnsCount = 0
gridLayout.minimumLineSpacing = 5
gridLayout.minimumInteritemSpacing = 5
}
}
}
// MARK: - Collection view data source and delegate methods
extension ViewController: UICollectionViewDataSource {
func numberOfSections(in collectionView: UICollectionView) -> Int {
return SectionsAndRows.count
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
print(SectionsAndRows[section])
return SectionsAndRows[section]
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: CollectionViewCell.reuseID, for: indexPath) as? CollectionViewCell else {
return UICollectionViewCell()
}
print("Current Section ==\(indexPath.section) CurrentRow ===\(indexPath.row) and its rows count ==\(SectionsAndRows[indexPath.section])")
cell.titleLabel.text = ""
cell.btn.addTarget(self, action: #selector(handleAdd(sender:)), for: .touchUpInside)
cell.btn.tag = (indexPath.section * 1000) + indexPath.row
if enumDirection == .Verticle {
if indexPath.section == SectionsAndRows.count - 1 {
cell.btn.setTitle("+", for: .normal)
} else {
cell.btn.setTitle("\(indexPath)", for: .normal)
}
}
return cell
}
#objc func handleAdd(sender: UIButton) {
// Perform some opration
}
}
extension ViewController: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 5
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: 100, height: 100)
}
}
CollectionViewCell.swift
import UIKit
class CollectionViewCell: UICollectionViewCell {
static let reuseID = "CollectionViewCell"
#IBOutlet weak var btn: UIButton!
#IBOutlet weak var titleLabel: UILabel!
}
If you run the code, it will show a Collection of 1 row and 1 column in each row. If you uncomment the last line of viewDidLoad() (SectionsAndRows.append(5)) function, then it works fine.
My observation is that the last section of the CollectionView will have the highest number of a column. Is that correct or is this a bug of a CollectionView?