Constrains for ImageView is not working

Question

I have used AutoLayout with one of my UICollectionView I'm facing issue with height and width for imageView. I have added UIImageView in my UICollectionViewCell like following with below constraints.

UICollectionViewDataSource methods.

func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return 100
}

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {

    var width = Int((collectionView.frame.size.width - 30) / 4)
    if width % 2 != 0 {
        width += 1
    }        
    return CGSize(width: CGFloat(width), height: CGFloat(width))
}

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("Cell", forIndexPath: indexPath) as! CustomCell
    print("Cell Size - \(cell.bounds)")
    print("ImageView Size - \(cell.imageView.frame)")
    return cell
}

But when I run this the ImageView is always coming with 70X70 no matter on which device I will run but UICollectionViewCell size is increasing and decreasing on different devices.

On iPhone 6 it will looks like below.

I have set backgroundColor of UIImageView to white color and red color for UICollectionViewCell so that it will give batter understanding the console log for Cell and ImageView Size is as below.

Cell Size - (0.0, 0.0, 86.0, 86.0)
ImageView Size - (5.0, 5.0, 70.0, 70.0)
Cell Size - (0.0, 0.0, 86.0, 86.0)
ImageView Size - (5.0, 5.0, 70.0, 70.0)

Please any one help me why the imageView size is not increasing or decreasing according to the UICollectionViewCell. Any help would be appreciated.

Answer 1

After researching a bit I have came up with the following way to solved this issue of AutoLayout with UICollectionViewCell. From Xcode 6 CollectionViewCell doesn't show the contentView in interface builder, so in the awakeFromNib of cell I have set its autoresizingMask and it works like charm.

class CustomCell: UICollectionViewCell {
  @IBOutlet
  var imageView: UIImageView!

    override func awakeFromNib() {
      super.awakeFromNib()
      //Below line solved my problem
      self.contentView.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]
    }
}