Use openCV in C++ and in Swift

Question

In my Swift project I use some C++ code, that use openCV framework. So I create Objective-C wrapper and it's works ok. Then I want to use some openCV functionality directly from swift. I add

#import <opencv2/opencv.hpp>

to "Bridging-Header.h" and get bunch of error "Core.hpp header must be compiled as C++" from C++ code. Is there any way to work with OpenCV in C++ code and in Swift code in the same project?

You *cannot* import C++ headers to Swift (as was pointed out to you at https://stackoverflow.com/a/49451486). Using a wrapper is the only approach. — Martin R, Mar 27 '18 at 07:42
See also [Interacting with C++ classes from Swift](https://stackoverflow.com/questions/35229149/interacting-with-c-classes-from-swift) — Martin R, Mar 27 '18 at 07:52
Possible duplicate of [swift and c++ function with pointers](https://stackoverflow.com/questions/49451133/swift-and-c-function-with-pointers) — Enea Dume, Mar 27 '18 at 08:09

score 1 · Answer 1 · answered Mar 27 '18 at 07:43

1

This is not possible to use C++ headers inside bridging header file. Wrap all C++ code by h/mm files

answered Mar 27 '18 at 07:43

Vyacheslav

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score 0 · Answer 2 · answered Sep 14 '20 at 18:03

integrate OpenCV using pod instead of integrating the library directly.

Create the .pch file and import.

#ifndef PrefixHeader_pch
#define PrefixHeader_pch
#ifdef __cplusplus
#include <opencv2/opencv.hpp>
#endif
#endif /* PrefixHeader_pch */

Create the Wrapper file in Objective C file .h and .m and rename the .m to .mm

Write all logic part in the wrapper file
Create a bridging header file and import the Wrapper file into it.
```
#import "OpenCVWrapperr.h"
```

Use openCV in C++ and in Swift

2 Answers2