ios - How to zoom a UIScrollView inside of a UICollectionViewCell?

Question

I'm trying to add a UIScrollView inside of a UICollectionViewCell. The idea is that you can use pinch to zoom the UIScrollView (and with it, the image within), but the scrollview doesn't seem to handle any gesture. I'm guessing they are being caught by the UICollectionView.

I've set the delegate of the UIScrollView to be the UICollectionViewCell, but none of the delegate methods are being called.

EDIT: I've made a github repo with the code (simplified as much as I could). Even though it's just a few lines of code, I cannot see what I did wrong.

EDIT2: After the answer was found, I added the fixes to the above-mentioned repo, hope others find it helpful too :)

https://github.com/krummler/gallery-pinchzoom-example

Answer 1

I just made an implementation for SWIFT 3 on iOS 9.3+ and all i done was:

1. Place the image view inside a scrollview

2. Connect the scrollview delegate to collectionview cell class

3. Implement the code below on the collectionview subclass

class FullScreenImageTextDetailCollectionViewCell: UICollectionViewCell, UIScrollViewDelegate {

     @IBOutlet var scrollview: UIScrollView!
     @IBOutlet weak var backgroundImageView: UIImageView!

     override func awakeFromNib() {
         self.scrollview.minimumZoomScale = 0.5
         self.scrollview.maximumZoomScale = 3.5
         self.scrollview.delegate = self
     }

     func viewForZooming(in scrollView: UIScrollView) -> UIView? {
         return self.backgroundImageView
     }
}

No gesture recognizer adding or removing on the parent collectionview controller was necessary, worked like a charm!

Thanks for previous examples for reaching this!