Passing images between controllers in full resolution - swift

Question

My problem is that that when I'm passing image from one controller to another somehow the image looks very bad (very low resolution). The problem is not in passing images but that I'm requesting image in a wrong way.
public var pickedImage: UIImage!
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let asset = images[indexPath.row]
let manager = PHImageManager.default()
manager.requestImage(for: asset, targetSize: PHImageManagerMaximumSize,
contentMode: .aspectFit,
options: nil) { (result, _) in
self.pickedImage = result
}
self.performSegue(withIdentifier: "showDetailSegue", sender: nil)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showDetailSegue" {
let dvc = segue.destination as! ViewController
dvc.vcImage = pickedImage
}
}
Fun fact. When I'm displaying images in collectionView (in the same viewcontroller from which I'm trying to send) they're in full resolution even when I'm using same code as mentioned above.
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "photocell", for: indexPath) as! PhotoLibraryCollectionViewCell
cell.image.layer.cornerRadius = 10
cell.image.clipsToBounds = true
let asset = images[indexPath.row]
let manager = PHImageManager.default()
if cell.tag != 0 {
manager.cancelImageRequest(PHImageRequestID(cell.tag))
}
cell.tag = Int(manager.requestImage(for: asset,
targetSize: PHImageManagerMaximumSize,
contentMode: .aspectFill,
options: nil) { (result, _) in
cell.image.image = result
})
return cell
}
Example: Original
With requestImage

Answer 1

Found solution to my problem.
func convertImageFromAsset(asset: PHAsset) -> UIImage {
let manager = PHImageManager.default()
let option = PHImageRequestOptions()
var image = UIImage()
option.isSynchronous = true
manager.requestImage(for: asset, targetSize: PHImageManagerMaximumSize, contentMode: .aspectFit, options: option, resultHandler: {(result, info)->Void in
image = result!
})
return image
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
pickedImage = convertImageFromAsset(asset: images[indexPath.item])
self.performSegue(withIdentifier: "showDetailSegue", sender: nil)
}