v5.1

Swift / Objective-C / C++
OpenCV 4.3
Swift 5.5 concurrency - async / await
Exception / error handling from C++ -> Objective-C -> Swift
Tested with XCode 13.2 / Swift 5.5 for iOS 13.0+

v5.0

Swift 5.0
OpenCV 4.3
Tested with XCode 12 / Swift 5.0 for iOS 9.0+