如何在Swift iOS中更改自定义“收藏夹视图”单元格的背景颜色？

Question

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

    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! PlaceCollectionViewCell

    //let imageView = UIImageView()
    //cell.backgroundColor = UIColor(colorLiteralRed: 0.278, green: 0.694, blue: 0.537, alpha: 1.00)

    cell.layer.borderWidth = 0.5
    cell.layer.borderColor = UIColor(colorLiteralRed: 0.278, green: 0.694, blue: 0.537, alpha: 1.00).cgColor

   //cell.placeLabel.tintColor = UIColor(colorLiteralRed: 0.278, green: 0.694, blue: 0.537, alpha: 1.00).cgColor

    cell.layer.cornerRadius = 40
    cell.layer.masksToBounds = true

    print("places\(indexPath.row)")
    //cell.placeLabel.text = places[indexPath.row] as! String
    cell.placeLabel.text = places[indexPath.row]
    cell.placeLabel.textColor = UIColor(colorLiteralRed: 0.278, green: 0.694, blue: 0.537, alpha: 1.00)

    return cell
}

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {

    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! PlaceCollectionViewCell

    if (indexPath.row == 0){

        cell.backgroundColor = UIColor(colorLiteralRed: 0.278, green: 0.694, blue: 0.537, alpha: 1.00)

    }
}

I created a custom collectionViewCell . When I click one of the cell it's backgroundColor should change. How can I achieve this?

I have tried it in didSelectItemItamAt indexpath method but its not working. Please help.

Answer 1

You can use selectedBackgroundView property of UICollectionViewCell for that, inside cellForItemAt indexPath set that property and now when you select cell it will automatically change the backgroundColor of that cell.

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
     let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! PlaceCollectionViewCell
     //Your other code

     //Add code to set selectedBackgroundView property
     let view = UIView(frame: cell.bounds)
     // Set background color that you want
     view.backgroundColor = UIColor(colorLiteralRed: 0.278, green: 0.694, blue: 0.537, alpha: 1.00) 
     cell.selectedBackgroundView = view
     return cell
}

Using this now there is no need to change backgroundColor of cell in didSelectItemAt indexPath it will work automatically and change backgroundColor for that selected cell.

Answer 2

Write this in your cellForItemAt or didSelectItemAt

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {

let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! PlaceCollectionViewCell

if (indexPath.row == 0){

cell.backgroundColor =  UIColor(colorLiteralRed: 0.278, green: 0.694, blue: 0.537, alpha: 1.00) 
cell.contentView.backgroundColor =  UIColor(colorLiteralRed: 0.278, green: 0.694, blue: 0.537, alpha: 1.00) 
collectionView.reloadItemsAtIndexPaths(indexPath)

}

}