ImageView

let myImageView = UIImageView()

myImageView.frame = CGRect(x: 100, y: 100, width: 100, height: 100)
myImageView.image = UIImage(named:"imageName.png")
self.view.addSubview(myImageView)

 myImageView.contentMode = UIViewContentMode.scaleToFill
// myImageView.contentMode = UIViewContentMode.scaleAspectFit
// myImageView.contentMode = UIViewContentMode.scaleAspectFill