CollectionView Swift [closed] - ios

Question

Closed. This question needs to be more focused. It is not currently accepting answers.
Want to improve this question? Update the question so it focuses on one problem only by editing this post.
Closed 4 years ago.
Improve this question
I have a UICollectionView which displays content received from the web. The number of cells can be known only at runtime. Client's requirement is that each row in the collection view must have a different color.
For example, If I have to show 12 items in my UICollectionView then suppose if first row has 3 cells then the colour of all three cells should be red.
Cells of second row should be white and so on.
Could you please help me how to achieve it?
Thanks in advance.

Answer 1

on cellForRowAt, if you want to intercalate colors, you can check indexPath.row and update the background color.
if indexPath.item % 2 == 0 {
<#YourCell#>.backgroundColor = .blue
} else {
<#YourCell#>.backgroundColor = .green
}
Also, if you want random colors, you can check this answer: How to make a random color with Swift
Then you just set <#YourCell#>.backgroundColor the random color
In the case that the collectionViewCell has another collectionView on each cell, and those have to match the same color for each parent collectionView row, I'd suggest you to create a custom class for the parent collectionView cell, so that every collectionView child row can consume from it and set it's own backgroundColor.

Answer 2

Updated answer:
I'm supposing you have initially you have these variables like:
private let cellBackgroundColors: [UIColor] = [.yellow, .green, .blue, .purple]
private let numberOfRows = 3 (or you can assign it dynamically)
Second step, implement like this:
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellIdentifier, for: indexPath) as! ToDoListCollectionCell
let index = indexPath.item / numberOfRows
if index < cellBackgroundColors.count {
cell.backgroundColor = cellBackgroundColors[index]
} else {
cell.backgroundColor = .white // Set your default color to handle this case
}
return cell
}
Happy Coding !!