Delay with CollectionView Did Select - ios

Question

I'm getting a second long delay when selecting my collectionview cell. Here is my current code for collection view did select:
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let vc = PopUpCellViewController(nibName: "PopUpCellViewController", bundle: nil)
self.navigationController?.pushViewController(vc, animated: true)
print("called")
let cell = collectionView.cellForItem(at: indexPath) as! AnnotatedPhotoCell
sourceCell = cell
vc.picture = resizeImage(image: cell.imageView.image!, targetSize: CGSize(width: (view.bounds.width - 45),height: 0))
vc.comment = cell.commentLabel
var image = UIImage(named: "back_button_thick")
image = image?.withRenderingMode(UIImageRenderingMode.alwaysOriginal)
self.navigationController?.navigationBar.backIndicatorImage = image
self.navigationController?.navigationBar.backIndicatorTransitionMaskImage = image
self.navigationItem.backBarButtonItem = UIBarButtonItem(title: " ", style: UIBarButtonItemStyle.plain, target: nil, action: nil)
}
func resizeImage(image: UIImage, targetSize: CGSize) -> UIImage {
let size = image.size
let widthRatio = targetSize.width / image.size.width
// Figure out what our orientation is, and use that to form the rectangle
var newSize: CGSize
newSize = CGSize(width: size.width * widthRatio, height: size.height * widthRatio)
// This is the rect that we've calculated out and this is what is actually used below
let rect = CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height)
// Actually do the resizing to the rect using the ImageContext stuff
UIGraphicsBeginImageContextWithOptions(newSize, false, 1.0)
image.draw(in: rect)
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return newImage!
}
I am using a UIViewControllerAnimatedTransitioning. I am confident that there is no delay with my UIViewControllerAnimatedTransitioning. There seems to be an issue with my CollectionView Did select function. If switch my code in my didSelect function for a print statement, there is no longera delay.

Answer 1

I have two solutions:
1: PROBABLY NOT: I'm guessing that it's giving an annoying delay because it's taking a while for your app to run the code to get the nib file, and change all those things while it shouldn't.
2: PROBABLY: Perhaps running it on a real device will help. Xcode always has bugs, so don't worry. :)