Helper method which scales down the size of an image, before being uploaded to Firebase Storage

ResizeImage.swift

extension UIImage {
// Usage:
// let scaledImage = image.scale(newWidth: 960.0)
    func reduceImageSize(to newWidth: CGFloat) -> UIImage {
        
        if self.size.width == newWidth {
            return self
        }
        
        // Calculates the scaling factor
        let scaleFactor = newWidth / self.size.width
        let newHeight = self.size.height * scaleFactor
        let newSize = CGSize(width: newWidth, height: newHeight)
        UIGraphicsBeginImageContextWithOptions(newSize, false, 0.0)
        self.draw(in: CGRect(x: 0, y: 0, width: newWidth, height: newHeight))
        let newImage: UIImage? = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
                
        return newImage ?? self
    }    
}