Set selected color of cell in UiCollectionView in swift

Question

I am using collectionview to display data.

each cell's selected and unselected color is there

but i want to set default color of first cell in collectionview.

if there are 10 data. my first cell should be like in screenshot

how to achieve this? when i set color at indexpath this issue occurs

Answer 1

For two different colors based on selected state of the cell, you may need to subclass your UICollectionViewCell like this:

import UIKit 

class YourCollectionViewCell: UICollectionViewCell {

    @IBOutlet weak var imageView: UIImageView! // for example - some UI element inside cell ...

    override var isSelected: Bool {
        didSet {
            self.contentView.backgroundColor = isSelected ? UIColor.blue : UIColor.yellow
            self.imageView.alpha = isSelected ? 0.75 : 1.0
        }  
      }
    }


// and below you will have your original code

class YourViewController: UICollectionViewController {

... etc

Answering your question - for exceptional style of the first cell:

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

        let cell = collectionView.dequeueReusableCell ... 

        if(indexPath.row == 0) { //for first cell in the collection
            cell.backgroundColor = UIColor.orange
        } else {
            cell.backgroundColor = UIColor.green
        }

Answer 2

this is my code for this issue. Hope it save time for you :)

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "customCell", for: indexPath) as! CustomCell
    
    if let indexPaths = collectionView.indexPathsForSelectedItems, let indexP = indexPaths.first {
        cell.bgView.backgroundColor = indexP == indexPath ? .white : .lightGray
    }
    
    return cell
}

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    if let cell = collectionView.cellForItem(at: indexPath) as? CustomCell {
        cell.bgView.backgroundColor = .white 
    }
}

func collectionView(_ collectionView: UICollectionView, didDeselectItemAt indexPath: IndexPath) {
    guard let cell = collectionView.cellForItem(at: indexPath) as? CustomCell else {
        return
    }
    
    cell.bgView.backgroundColor = .lightGray
}