Image Resizer

UIImage+Resize.swift

enum Resize {
    case current
    case resize(CGSize)
}

extension UIImage {
    
    func resize(_ resize: Resize) -> UIImage? {
        guard case let .resize(size) = resize else { return self }
        
        //Remove optional when migrating to iOS 10
        if #available(iOS 10.0, *) {
            let renderer = UIGraphicsImageRenderer(size: size)
            return renderer.image { rendererContext in
                draw(in: CGRect(origin: .zero, size: size))
            }
        } else {
            UIGraphicsBeginImageContextWithOptions(size, false, 0)
            self.draw(in: CGRect(origin: .zero, size: size))
            let newImage = UIGraphicsGetImageFromCurrentImageContext()
            UIGraphicsEndImageContext()
            return newImage
        }
    }
}