UICollectionViewCell gets resized by UIImageView

Hello!

I've noticed a very strange behavior with UICollectionViewCell.

I am currently using XCode 11.

I have an UICollectionView and a simple UICollectionViewCell with an imageview inside.

The Imageview has four constraints Trailing, Leading, Bottom and Space to Superview.

The delegates are implemented:

extension ViewController: UICollectionViewDataSource {
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return data.count
    }
   
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "collCell", for: indexPath)
        cell.backgroundColor = data[indexPath.row]
       
        return cell
    }
}

extension ViewController: UICollectionViewDelegateFlowLayout {
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(width: 200.0, height: 200.0)
    }
}

This

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(width: 200.0, height: 200.0)
    }

should create cells with the size 200x200. Which is working fine unless i add a image to the imageview within UICollectionViewCell.

Then the cell gets the size of that image and is no longer 200x200

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "collCell", for: indexPath)
        cell.backgroundColor = data[indexPath.row]
        cell.imageView.image = UIImage(named: "test")
        return cell
    }

How to prevent the imageview to resize the uicollectionviewcell?

Thank you