Btukfyl

I've been looking for a way to reload my collection view header. So I have a collection view header & a CollectionViewCell that only contains an image. Now when the cell is press, I would like to display the image in the header view without calling collectionView.reloadData(). This is how my didSelectItemAt & didDeselectItemAt method looks like.

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

    selectedImage = images[indexPath.item]

    let imageCell = collectionView.cellForItem(at: indexPath) as! CollectionCell

    imageCell.photoBackgroundView.backgroundColor = .red



    collectionView.reloadData()

}



override func collectionView(_ collectionView: UICollectionView, didDeselectItemAt indexPath: IndexPath) {

    let imageCell = collectionView.cellForItem(at: indexPath) as! ImagePickerCell

    imageCell.photoBackgroundView.backgroundColor = .black

}

So when I select a cell the view turns red, when I deselect it the view turns black. This video here, shows how the behavior without reloading the collectionView. Now here is were I would like to reload the header view.

If I do use collectionView.reloadData(), this is the outcome. How would I be able to reload the header or the collectionView where the header view displays the selected cell image & turns red.

You can try like global instance for that. Like

class YourClass: UIViewController {



 /// Profile imageView

    var profileImageview = UIImageView()



}

In CollectionView cellforItem assign a imageview. Like

let imageCell = collectionView.cellForItem(at: indexPath) as! CollectionCell

profileImageview = imageCell.imageView

Then when every you selecting collectionViewCell

You can call a function to change a image of imageView. Like

func updateImage() {

  profileImageview.image = UIImage()



}

Well I'm trying to understand why sometimes you cast the cell in CollectionCell and sometimes in ImagePickerCell, anyway try to change your functions in these

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

    let cell = collectionView.cellForItem(at: indexPath) as! CollectionCell

    cell?.photoBackgroundView.backgroundColor = .red

}



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

    let cell = collectionView.cellForItem(at: indexPath) as! CollectionCell

    cell?.photoBackgroundView.backgroundColor = .black

}