Click cell animation with Swift 3

Question

My problem is really simple. I would like to animate a cell in collectionView. Indeed, I would like to show the gray background behind the cell and reduce the image inside.

This will be (almost) the same effect as Pinterest:

I used the coding of this animation on buttons, but never did it on a cell. How to associate a cell, for example, with a TouchUpInside or TouchDown action?

Answer 1

If you want to start the animation when you touch the cell, you can implement it didHighlightItemAt. You probably want to cancel it in didUnhighlightItemAt:

override func collectionView(_ collectionView: UICollectionView, didHighlightItemAt indexPath: IndexPath) {
    UIView.animate(withDuration: 0.5) {
        if let cell = collectionView.cellForItem(at: indexPath) as? CustomCell {            
            cell.imageView.transform = .init(scaleX: 0.95, y: 0.95)
            cell.contentView.backgroundColor = UIColor(red: 0.95, green: 0.95, blue: 0.95, alpha: 1)
        }
    }
}

override func collectionView(_ collectionView: UICollectionView, didUnhighlightItemAt indexPath: IndexPath) {
    UIView.animate(withDuration: 0.5) {
        if let cell = collectionView.cellForItem(at: indexPath) as? CustomCell {
            cell.imageView.transform = .identity
            cell.contentView.backgroundColor = .clear
        }
    }
}

This gives:

Answer 2

:

UICollectionViewCell imageView transform, , ..

class CollectionViewCell: UICollectionViewCell
{
    @IBOutlet weak var imageView: UIImageView!

    override var isSelected: Bool{
        didSet{
            UIView.animate(withDuration: 2.0) {
                self.imageView.transform = self.isSelected ? CGAffineTransform(scaleX: 0.9, y: 0.9) : CGAffineTransform.identity
            }
        }
    }
}

Answer 3

, :

override var isHighlighted: Bool {
  didSet {
    UIView.animate(withDuration: 0.5) {
      let scale: CGFloat = 0.9
      self.transform = self.isHighlighted ? CGAffineTransform(scaleX: scale, y: scale) : .identity
    }
  }
}

, [pgdev] [1], isHighlighted

Answer 4

.

• view collectionView(:didSelectItemAtIndexPath:) .

• , .

• , IBAction , .

Answer 5

Swift: 4 UICollectionViewCell, transform contentView imageView contentView

override var isSelected: Bool {
                didSet{
                       UIView.animate(withDuration: 1.0, animations: 
                        {
                             self.contentView.transform = self.isSelected ? CGAffineTransform(scaleX: 0.95, y: 0.95) : CGAffineTransform.identity
                             self.contentView.backgroundColor = UIColor(red: 0.95, green: 0.95, blue: 0.95, alpha: 1)
                        }) { (true) in
                        UIView.animate(withDuration: 0.5, animations:
                        {
                             self.contentView.transform = self.isSelected ?  CGAffineTransform(scaleX: 1.0, y: 1.0) : CGAffineTransform.identity
                             self.contentView.backgroundColor = UIColor.clear
                        })
                    } 
                 }
             }

Answer 6

Swift 4.2, inside a UICollectionViewCell

    //MARK:- Events
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesBegan(touches, with: event)
        animate(isHighlighted: true)
    }

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesEnded(touches, with: event)
        animate(isHighlighted: false)
    }

    override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesCancelled(touches, with: event)
        animate(isHighlighted: false)
    }

    //MARK:- Private functions
    private func animate(isHighlighted: Bool, completion: ((Bool) -> Void)?=nil) {
        let animationOptions: UIView.AnimationOptions = [.allowUserInteraction]
        if isHighlighted {
            UIView.animate(withDuration: 0.5,
                           delay: 0,
                           usingSpringWithDamping: 1,
                           initialSpringVelocity: 0,
                           options: animationOptions, animations: {
                            self.transform = .init(scaleX: 0.96, y: 0.96)
            }, completion: completion)
        } else {
            UIView.animate(withDuration: 0.5,
                           delay: 0,
                           usingSpringWithDamping: 1,
                           initialSpringVelocity: 0,
                           options: animationOptions, animations: {
                            self.transform = .identity
            }, completion: completion)
        }
    }