Passing data from one collectionView to other collectionView

Question

In a UICollectionView , I am displaying images and on clicking the image it opens up in a ViewController. Works fine.

However, I want to swipe the images to right/left when the image opens in the new viewController.

To swipe the images, I tried adding a CollectionView in the DetailViewController and added UIImageView inside the cell.

//on clicking the image from main view controller

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        let vc = storyboard?.instantiateViewController(withIdentifier: "DetailViewController") as? DetailViewController
        vc?.name = imgArr[indexPath.row]
        self.navigationController?.pushViewController(vc!, animated: true)
    }

The error is:

"Illegal Configuration: The img outlet from the DetailViewController to the UIImageView is invalid. Outlets cannot be connected to repeating content."

Answer 1

the easiest way for you will be to pass the whole imgArr as a data source for the collectionView in the DetailViewController . Then define a selectedName property in the DetailViewController and scroll to the selected name before DetailViewController has appeared.

EDIT:

//on clicking the image from main view controller

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        if let vc = storyboard?.instantiateViewController(withIdentifier: "DetailViewController") as? DetailViewController {
        vc.imgArr = imgArr
        vc.selectedNameIndex = imgArr[indexPath.row]
        self.navigationController?.pushViewController(vc, animated: true)

    }
}