Dynamic UIImageView Size Within UITableView

Question

I want to implement a TableView with a Custom TableViewCell showing an image.

To make this simple, I simply put a UIImageView inside a tableviewcell using autolayout

Answer 1

In the storyboard add trailing, leading, bottom and top constraints to your UIImageView. After you load your image all you need to do is add an aspect constraint to your UIImageView. Your images cell would look something like this:

class ImageTableViewCell: UITableViewCell {

    @IBOutlet weak var customImageView: UIImageView!

    internal var aspectConstraint : NSLayoutConstraint? {
        didSet {
            if oldValue != nil {
                customImageView.removeConstraint(oldValue!)
            }
            if aspectConstraint != nil {
                customImageView.addConstraint(aspectConstraint!)
            }
        }
    }

    override func prepareForReuse() {
        super.prepareForReuse()
        aspectConstraint = nil
    }

    func setCustomImage(image : UIImage) {

        let aspect = image.size.width / image.size.height

        let constraint = NSLayoutConstraint(item: customImageView, attribute: NSLayoutAttribute.width, relatedBy: NSLayoutRelation.equal, toItem: customImageView, attribute: NSLayoutAttribute.height, multiplier: aspect, constant: 0.0)
        constraint.priority = 999

        aspectConstraint = constraint

        customImageView.image = image
    }
}

You can check working example here DynamicTableWithImages