swift set image size
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! } }