Resize UIImage Swift 3

UIImage+Extension.swift

import UIKit

extension UIImage {
  
  func resizeWith(percentage: CGFloat) -> UIImage? {
    let imageView = UIImageView(frame: CGRect(origin: .zero, size: CGSize(width: size.width * percentage, height: size.height * percentage)))
    imageView.contentMode = .scaleAspectFit
    imageView.image = self
    UIGraphicsBeginImageContextWithOptions(imageView.bounds.size, false, scale)
    guard let context = UIGraphicsGetCurrentContext() else { return nil }
    imageView.layer.render(in: context)
    guard let result = UIGraphicsGetImageFromCurrentImageContext() else { return nil }
    UIGraphicsEndImageContext()
    return result
  }
  
  func resizeWith(width: CGFloat) -> UIImage? {
    let imageView = UIImageView(frame: CGRect(origin: .zero, size: CGSize(width: width, height: CGFloat(ceil(width/size.width * size.height)))))
    imageView.contentMode = .scaleAspectFit
    imageView.image = self
    UIGraphicsBeginImageContextWithOptions(imageView.bounds.size, false, scale)
    guard let context = UIGraphicsGetCurrentContext() else { return nil }
    imageView.layer.render(in: context)
    guard let result = UIGraphicsGetImageFromCurrentImageContext() else { return nil }
    UIGraphicsEndImageContext()
    return result
  }
  
}