1. Unity call Swift function with param
2. Swift call Unity function with param
3. Unity present Native Storyboard UIViewController

Requirement:

XCode: 10.1
Unity: 2018.2 or later
iOS: 10 or later

Reference:

1. https://medium.com/@kevinhuyskens/implementing-swift-in-unity-53e0b668f895
2. https://medium.com/@IronEqual/how-to-embed-a-unity-game-into-an-ios-native-swift-app-772a0b65c82