UIImage+Cropping.swift

extension UIImage {
  func imageCenterCroppedTo(cropSize: CGSize) -> UIImage {
        let cropWidth: CGFloat = cropSize.width // 200
        let cropHeight: CGFloat = cropSize.height // 200
        
        let cropRatio = cropWidth / cropHeight
        
        let naturalRatio = self.size.width / self.size.height
        
        var scaledWidth = cropWidth
        var scaledHeight = cropHeight
        
        var xOffset: CGFloat = 0
        var yOffset: CGFloat = 0
        
        if cropRatio > naturalRatio {
            // fit width
            scaledHeight = scaledWidth / naturalRatio
            yOffset = -1 * abs(scaledHeight - cropHeight) / 2.0
        } else {
            // fit height
            scaledWidth = scaledHeight * naturalRatio
            xOffset = -1 * abs(scaledWidth - cropWidth) / 2.0
        }
        
        UIGraphicsBeginImageContextWithOptions(CGSize(width: cropWidth, height: cropHeight), false, self.scale);
        
        self.draw(in: CGRect(x: xOffset, y: yOffset, width: ceil(scaledWidth), height: ceil(scaledHeight)))
        
        let croppedImage = UIGraphicsGetImageFromCurrentImageContext()
        
        UIGraphicsEndImageContext();
        
        return croppedImage!
    }
}