Access Mat.data from Swift

MatDataExt.h

//
//  MatDataExt.h
//
//  Created by Giles Payne on 2020/10/05.
//

#pragma once

#ifdef __cplusplus
#import <opencv2/opencv2.h>
#endif

#import <Foundation/Foundation.h>

@class Mat;

@interface MatDataExt: NSObject

+(unsigned char*)getMatData:(Mat*)mat;

@end

MatDataExt.mm

//
//  MatDataExt.mm
//
//  Created by Giles Payne on 2020/10/05.
//

#import "MatDataExt.h"
#import "opencv2/Mat.h"

@implementation MatDataExt

+(unsigned char*)getMatData:(Mat*)mat {
    return [mat nativePtr]->data;
}

@end

MatDataExt.swift

//
//  MatDataExt.swift
//
//  Created by Giles Payne on 2020/10/05.
//

import Foundation
import opencv2

extension Mat {
    var data: UnsafeMutablePointer<UInt8> {
        return MatDataExt.getMatData(self)
    }
}

MyProject-Bridging-Header

//
//  Make sure to set Objective-C Bridging Header in the project's Build Settings
//

#import "MatDataExt.h"