opencv/modules/imgcodecs/src/ios_conversions.mm

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#import <UIKit/UIKit.h>
#include "apple_conversions.h"

CV_EXPORTS UIImage* MatToUIImage(const cv::Mat& image);
CV_EXPORTS void UIImageToMat(const UIImage* image, cv::Mat& m, bool alphaExist);

UIImage* MatToUIImage(const cv::Mat& image) {
    // Creating CGImage from cv::Mat
    CGImageRef imageRef = MatToCGImage(image);

    // Getting UIImage from CGImage
    UIImage *uiImage = [UIImage imageWithCGImage:imageRef];
    CGImageRelease(imageRef);

    return uiImage;
}

void UIImageToMat(const UIImage* image, cv::Mat& m, bool alphaExist) {
    CGImageRef imageRef = image.CGImage;
    CGImageToMat(imageRef, m, alphaExist);
}