UICollectionView indexPath.row strange behaviour - ios

Question

I'm having strange issue while scrolling one of my collectionViews. When I'm printing indexPath.row is goes ok from 0..6 but then last indexPath.row is 3, and then if I scroll back it either crashes with excbadadress or prints 1, 2, 4 in random order. I assume that I have and error in my code but really don't understand where is it.
Here is my code:
VC:
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: IndexPath) -> CGSize {
if collectionView == mainEventsCollectionView {
return CGSize(width: UIScreen.main.bounds.width - 40, height: 180)
} else {
return CGSize(width: 150, height: 200)
}
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if collectionView == mainEventsCollectionView {
return 3
} else {
return 7
}
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if collectionView == mainEventsCollectionView {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "mainEventsCell", for: indexPath) as! MainEventCollectionViewCell
cell.eventTitle.text = "Hello world".uppercased()
cell.setupCell()
return cell
} else {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "importantEventsCell", for: indexPath) as! ImportantEventsCollectionViewCell
print(indexPath.row)
cell.setupCell()
return cell
}
}
Cell:
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
self.roundCorners(.allCorners, radius: 6, borderColor: .clear, borderWidth: 0)
}
func setupCell() {
self.content.backgroundColor = colorWithAlpha(.black, alpha: 0.7)
self.eventDate.textColor = .white
self.eventTime.textColor = .white
self.eventName.textColor = .white
if self.content.layer.sublayers!.count > 3 {
self.content.layer.sublayers!.removeLast()
}
if self.eventDate.text == "Today" {
self.content.backgroundColor = .clear
DispatchQueue.main.async(execute: {
self.content.drawGradient(colors: [UIColor(red: 250/255, green: 217/255, blue: 97/255, alpha: 0.7).cgColor, UIColor(red: 255/255, green: 135/255, blue: 67/255, alpha: 0.7).cgColor], locations: [0, 1])
})
self.eventDate.textColor = .black
self.eventTime.textColor = .black
self.eventName.textColor = .black
}
}

Answer 1

Ok, the problem was that I've tried to apply gradient to a UIView, which had elements (UILables). What I had to do is add a subview to the UIView and apply gradient to it.