How do I make an UIImage/-View with rounded corners CGRect (Swift)

Question

How do I make a UIImageView with rounded corners on a Swift iOS Playground?
Inside it needs to be filled with a color.

Answer 1

let imageView = UIImageView(frame: CGRectMake(0, 0, 100, 100))
imageView.backgroundColor = UIColor.redColor()
imageView.layer.cornerRadius = 8.0
imageView.clipsToBounds = true

Result: