A function to let you resize UIImage for example for a the imageView on a UITableViewCell

Resize UIImage

    func resizeImageWith(image: UIImage, newSize: CGSize) -> UIImage {
        
        let horizontalRatio = newSize.width / image.size.width
        let verticalRatio = newSize.height / image.size.height
        
        let ratio = max(horizontalRatio, verticalRatio)
        let newSize = CGSize(width: image.size.width * ratio, height: image.size.height * ratio)
        var newImage: UIImage
        
        if #available(iOS 10.0, *) {
            let renderFormat = UIGraphicsImageRendererFormat.default()
            renderFormat.opaque = false
            let renderer = UIGraphicsImageRenderer(size: CGSize(width: newSize.width, height: newSize.height), format: renderFormat)
            newImage = renderer.image {
                (context) in
                image.draw(in: CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height))
            }
        } else {
            UIGraphicsBeginImageContextWithOptions(CGSize(width: newSize.width, height: newSize.height), true, 0)
            image.draw(in: CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height))
            newImage = UIGraphicsGetImageFromCurrentImageContext()!
            UIGraphicsEndImageContext()
        }
        
        return newImage
    }
    // Usage: image = resizeImageWith(image: image!, newSize: CGSize(width: 30, height: 30))