如何将选定的collectionview单元格发送到另一个视图控制器（ios）？

Question

I'm being able to detect the selected row (image) in my collection view, But I need to send it to another view controller. Here is a part of the code :

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

    if let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as? CollectionViewCell {

        cell.cellImage.image = UIImage(named: images[indexPath.row])
        return cell
    } else {
        return CollectionViewCell()

    }
}

//Printinig the selected image ID in console
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath)
{
    SelectedItem = indexPath.row + 1
    print(SelectedItem)
}

//Navigate to MPViewController
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    let DestViewController = segue.destination as!  MPViewController
    DestViewController.labelText = String(SelectedItem)
}
}

Answer 1

Take one instance variable in your destination class and set value of it in prepare for segue and then in viewDidload set that string to your label's text like,

 override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    let DestViewController = segue.destination as!  MPViewController
    DestViewController.yourText = String(SelectedItem) 
 }

ans in viewDidload

  yourLabel.text = yourText

Answer 2

//Printinig the selected image ID in console

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath)
{
    self.SelectedItem = indexPath.row + 1

    self.selectedImage = UIImage(named: images[indexPath.row]);

    print(SelectedItem)
}

//Navigate to MPViewController
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    let DestViewController = segue.destination as!  MPViewController
    DestViewController.imageSelected = self.selectedImage;
    DestViewController.selectedItem = String(self.SelectedItem);

}

Now in MPViewController you can use the data self.imageSelected and self.selectedItem as per your requirements.

Answer 3

Initialize a variable first

var imageToPass: UIImage!

Then update didSelectItemAt func

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath)
{
    SelectedItem = indexPath.row + 1
    print(SelectedItem)

    self.imageToPass = UIImage(named: images[SelectedItem])

    performSegue(withIdentifier: "TargetVC", sender: imageToPass) //here you give the identifier of target ViewController
}

Go to your TargetVC and initialize a variable

var getImage: UIImage!

Then override the function in previous VC

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

        if segue.identifier == "TargetVC" {

            if let targetVC = segue.destination as? TargetVC {

                if let imageToPass = sender as? UIImage {

                    TargetVC.getImage = imageToPass

                }

            }

        }
    }