UIImage+Resize.swift

//  Created by Evgeny Konkin on 17.06.2019.

extension UIImage {
    /// Resize image to new size ::byKonnn
    func resizeImage(to newImageSize: CGSize) -> UIImage {
        // Guard newSize is different
        guard self.size != newImageSize else { return self }
        
        let widthRatio  = newImageSize.width  / self.size.width
        let heightRatio = newImageSize.height / self.size.height
        
        // Figure out what our orientation is, and use that to form the rectangle
        var newSize: CGSize
        if(widthRatio > heightRatio) {
            newSize = CGSize(width: self.size.width * heightRatio, height: self.size.height * heightRatio)
        } else {
            newSize = CGSize(width: self.size.width * widthRatio, height: self.size.height * widthRatio)
        }
        
        // This is the rect that we've calculated out and this is what is actually used below
        let rect = CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height)
        
        // Actually do the resizing to the rect using the ImageContext stuff
        UIGraphicsBeginImageContextWithOptions(newSize, false, 1.0)
        self.draw(in: rect)
        let newImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        
        return newImage!
    }
}

// How to use
let imageView = UIImageView()
imageView.image = UIImage(named: "some_image_name")?.resizeImage(to: CGSize(width: 41, height: 41))



// ::byKonnn