ios - 如何从完成处理程序中返回值（特殊情况）？

Question

我正在尝试让 Mapbox 的应用程序导航在 SwiftUI 上工作。现在 viewController 返回 nil。我查看了这个问题的其他答案，其中大多数人建议在发生回调的函数中放置另一个完成处理程序。这是代码：

 func makeUIViewController(context: Context) -> NavigationViewController {
    getRoute { route in
           let viewController = NavigationViewController(for: route as! Route)
           viewController.modalPresentationStyle = .fullScreen
    }
    //Use of unresolved identifier viewController
    return viewController
}

向此函数添加闭包会给我错误：

类型“NavView”不符合协议“UIViewControllerRepresentable”

除了向函数添加闭包之外，我还能做些什么来从 getRoute{} 中获取值？

这是其余的代码：

struct NavView: UIViewControllerRepresentable{

typealias CompletionHandler = (Any) -> Void

func makeUIViewController(context: Context) -> NavigationViewController {
    getRoute { route in
           let viewController = NavigationViewController(for: route as! Route)
           viewController.modalPresentationStyle = .fullScreen
    }
    //Use of unresolved identifier viewController
    return viewController
}

func updateUIViewController(_ uiView: NavigationViewController, context: Context) {

}

func getRoute(_ completionHandler: @escaping CompletionHandler){
       // Define two waypoints to travel between
       let origin = Waypoint(coordinate: CLLocationCoordinate2D(latitude: 38.9131752, longitude: -77.0324047), name: "Mapbox")
       let destination = Waypoint(coordinate: CLLocationCoordinate2D(latitude: 38.8977, longitude: -77.0365), name: "White House")

       // Set options
       let options = NavigationRouteOptions(waypoints: [origin, destination])

       // Request a route using MapboxDirections.swift
       Directions.shared.calculate(options) { (waypoints, routes, error) in
          guard let route = routes?.first else { return }
          completionHandler(route)
       }
}