如何使用在GMSmap视图上快速(不直接)绘制路线
如何使用在GMSmap视图上快速(不直接)绘制路线
提问于 2020-02-10 06:04:15
我试图使用谷歌方向API在地图视图上绘制路线。我正在使用来自堆栈溢出本身的解决方案，但是我得到了一些关于intializers的错误。方向路线也会和谷歌地图本身一样，或者是笔直的路线。任何帮助都是非常感谢的。，我应该把这个方法称为，我得到的错误是
不能使用类型的参数列表(坐标:字符串、字符串、坐标: String、String )“”调用“GMSCoordinateBounds”类型的初始化程序
以下是守则。
func getRouteSteps(from source: CLLocationCoordinate2D, to destination: CLLocationCoordinate2D) {
let session = URLSession.shared
let url = URL(string: "https://maps.googleapis.com/maps/api/directions/json?origin=\(lat),\(long)&destination=\(directionlat),\(directionlong)&sensor=false&mode=driving&key=\(API KEY)")!
let task = session.dataTask(with: url, completionHandler: {
(data, response, error) in
guard error == nil else {
print(error!.localizedDescription)
return
}
guard let jsonResult = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? [String: Any] else {
print("error in JSONSerialization")
return
}
guard let routes = jsonResult!["routes"] as? [Any] else {
return
}
guard let route = routes[0] as? [String: Any] else {
return
}
guard let legs = route["legs"] as? [Any] else {
return
}
guard let leg = legs[0] as? [String: Any] else {
return
}
guard let steps = leg["steps"] as? [Any] else {
return
}
for item in steps {
guard let step = item as? [String: Any] else {
return
}
guard let polyline = step["polyline"] as? [String: Any] else {
return
}
guard let polyLineString = polyline["points"] as? String else {
return
}
//Call this method to draw path on map
DispatchQueue.main.async {
self.drawPath(from: polyLineString)
}
}
})
task.resume()
} 绘制折线的函数
func drawPath(from polyStr: String){
let mapView: GMSMapView
let path = GMSPath(fromEncodedPath: polyStr)
let polyline = GMSPolyline(path: path)
polyline.strokeWidth = 3.0
polyline.map = mapView // Google MapView
//
let cameraUpdate = GMSCameraUpdate.fit(GMSCoordinateBounds(coordinate: "\(lat)","\(long)", coordinate: "\(directionlat)","\(directionlong)")) as? [String : AnyObject]
mapView.moveCamera(cameraUpdate)
let currentZoom = mapView.camera.zoom
mapView.animate(toZoom: currentZoom - 1.4)
}回答 2
Stack Overflow用户
回答已采纳
发布于 2020-02-10 06:13:29
GMSCoordinatesBounds将CLLocationCoordinates2D类型作为参数，而不是String。
替换
let cameraUpdate = GMSCameraUpdate.fit(GMSCoordinateBounds(coordinate: "\(lat)","\(long)", coordinate: "\(directionlat)","\(directionlong)")) as? [String : AnyObject]使用
let cameraUpdate = GMSCameraUpdate.fit(GMSCoordinateBounds(coordinate: CLLocationCoordinate2D(latitude: Double(lat), longitude: Double(long)), coordinate: CLLocationCoordinate2D(latitude: Double(directionlat), longitude: Double(directionlat))))将mapView添加到视图控制器并获得坐标后，调用您的函数
self.getRouteSteps(from source: CLLocationCoordinate2D(latitude: Double(lat), longitude: Double(long)), destination: CLLocationCoordinate2D(latitude: Double(directionlat), longitude: Double(directionlat)))Stack Overflow用户
发布于 2020-02-10 06:53:13
您可以尝试这样做，使用下面的方法获取方向：
//This function is used to fetch the directions from origin to destination
private func fetchDirection(destinationLat: CLLocationDegrees, destinationLong: CLLocationDegrees) {
//Here you need to set your origin and destination points and mode
if let location = locationManager.location {
guard let url = URL(string: "\("https://maps.googleapis.com/maps/api/directions/json")?origin=\(location.coordinate.latitude),\(location.coordinate.longitude)&destination=\(destinationLat),\(destinationLong)&key=\(Constants.MapKey)") else { return }
let task = URLSession.shared.dataTask(with: url) { [unowned self](data, response, error) -> Void in
do {
guard let data = data else { return }
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
guard let mapData = try? decoder.decode(MapModel.self, from: data) else { return }
if let points = mapData.routes.first?.overviewPolyline.points {
self.drawRoute(points: points)
}
}
}
task.resume()
}
}用它在地图上画出路线：
//This function is used to draw the routes
private func drawRoute(points: String) {
let path = GMSPath.init(fromEncodedPath: points)
let singleLine = GMSPolyline.init(path: path)
self.polylines.append(singleLine)
singleLine.strokeWidth = 6.0
let gradientColor: GMSStrokeStyle = GMSStrokeStyle.gradient(from: .red, to: .blue)
singleLine.spans = [GMSStyleSpan.init(style: gradientColor)]
if self.polylines.count > 0 {
self.polylines.forEach{ $0.map = nil }
}
singleLine.map = self.mapView
}这是MapModel
struct MapModel: Decodable {
let status: String
let routes: [Routes]
}
struct Routes: Decodable {
let overviewPolyline: OverviewPolyline
}
struct OverviewPolyline: Decodable {
let points: String
}我希望您熟悉Codables，并且在收到这些要点时，我已经调用了drawRoute函数。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/60144849
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