How do set a width and height of an Image in Swift

Question

New to Swift and iOS programming in general. I couldn\'t figure out how to set a width and height of an image.
For example,

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Answer 1

Swift 3.0 version (from @YannickSteph)

extension UIImage {

    func imageResize (sizeChange:CGSize)-> UIImage{

        let hasAlpha = true
        let scale: CGFloat = 0.0 // Use scale factor of main screen

        UIGraphicsBeginImageContextWithOptions(sizeChange, !hasAlpha, scale)
        self.draw(in: CGRect(origin: CGPoint.zero, size: sizeChange))

        let scaledImage = UIGraphicsGetImageFromCurrentImageContext()
        return scaledImage!
    }

}