swift、JSON和google maps API中用户和标记之间的路由

import CoreLocation

class LocationManager: NSObject, CLLocationManagerDelegate {
    let locationManager = CLLocationManager()

    override init() {
        super.init()
        locationManager.delegate = self
        locationManager.requestWhenInUseAuthorization()
    }

    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        if let location = locations.first {
            // 用户的当前位置
            let userLocation = location.coordinate
            // 获取标记的位置（这里假设你已经有了标记的经纬度）
            let markerLocation = CLLocationCoordinate2D(latitude: YOUR_MARKER_LATITUDE, longitude: YOUR_MARKER_LONGITUDE)
            
            // 调用路由功能
            getDirections(from: userLocation, to: markerLocation)
        }
    }
}

import Foundation

func getDirections(from origin: CLLocationCoordinate2D, to destination: CLLocationCoordinate2D) {
    let apiKey = "YOUR_GOOGLE_MAPS_API_KEY"
    let urlString = "https://maps.googleapis.com/maps/api/directions/json?origin=\(origin.latitude),\(origin.longitude)&destination=\(destination.latitude),\(destination.longitude)&key=\(apiKey)"
    
    guard let url = URL(string: urlString) else { return }
    
    let task = URLSession.shared.dataTask(with: url) { data, response, error in
        guard let data = data else { return }
        
        do {
            if let json = try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any] {
                // 解析JSON数据
                if let routes = json["routes"] as? [[String: Any]], let firstRoute = routes.first {
                    // 处理第一条路线
                    if let legs = firstRoute["legs"] as? [[String: Any]], let firstLeg = legs.first {
                        // 处理第一段行程
                        if let steps = firstLeg["steps"] as? [[String: Any]] {
                            for step in steps {
                                if let htmlInstructions = step["html_instructions"] as? String {
                                    // 解析并显示路线指示
                                    print(htmlInstructions)
                                }
                            }
                        }
                    }
                }
            }
        } catch {
            print("Error parsing JSON: \(error.localizedDescription)")
        }
    }
    
    task.resume()
}

import GoogleMaps

func drawRouteOnMap(polyline: GMSPolyline) {
    polyline.map = mapView // mapView 是你的GMSMapView实例
}

// 在getDirections函数中，当解析完路线后，你可以创建一个GMSPolyline对象并调用drawRouteOnMap来显示路线。