ios - 如何向 google Direction api 发送请求以快速获取路径

Question

我是 swift 新手，我正在创建一个应用程序，它将显示用户的位置并在该位置放置一个标记。用户移动后。该标记将被删除并创建一个新标记。现在。我想在应用程序中在 A 点和 B 点上做标记，并在 map 上显示路线。它将使用 map 上最近的道路。我已经研究了谷歌地图文档，但我需要帮助，我不明白如何在两点之间制定路线？

如果您能帮助我，我会很高兴，非常感谢。

Answer 1

基于此blog ，您首先需要添加属性 let locationManager = CLLocationManager()，该属性将添加并实例化名为 locationManager 的 CLLocationManager 属性。

接下来，找到 viewDidLoad() 并将这两行添加到底部，这将使 MapViewController 成为 locationManager 的委托(delegate)并请求访问用户的位置。

locationManager.delegate = self
locationManager.requestWhenInUseAuthorization()

来自此相关thread ，您必须在 viewDidLoad() 中实例化 CLLocationManager 类，如下所示:

// Ask for Authorisation from the User.
self.locationManager.requestAlwaysAuthorization() 

// For use in foreground
self.locationManager.requestWhenInUseAuthorization()

if CLLocationManager.locationServicesEnabled() {
    locationManager.delegate = self
    locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
    locationManager.startUpdatingLocation()
}

然后在CLLocationManagerDelegate方法中你可以获取用户当前的位置坐标:

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    var locValue:CLLocationCoordinate2D = manager.location.coordinate
    print("locations = \(locValue.latitude) \(locValue.longitude)")
}

然后到add a marker ，创建一个包含位置和标题的GMSMarker对象，并设置其 map 。以下示例演示如何向现有 GMSMapView 对象添加标记。该标记在坐标 10,10 处创建，单击时会在信息窗口中显示字符串“Hello world”。

let  position = CLLocationCoordinate2DMake(10, 10)
let marker = GMSMarker(position: position)
marker.title = "Hello World"
marker.map = mapView

最后，在两点之间制定一条路线，您可以查看以下链接:

• How to get route between two locations in iOS?

Now in createRoute method give that city name or what ever you want as origin like this:

@IBAction func createRoute(sender: AnyObject) {

    let addressAlert = UIAlertController(title: "Create Route", message: "Connect locations with a route:", preferredStyle:

UIAlertControllerStyle.Alert)

    addressAlert.addTextFieldWithConfigurationHandler { (textField) -> Void in
        //give a origin for route
        textField.text = self.currentLocationName
        textField.userInteractionEnabled = false
    }

    addressAlert.addTextFieldWithConfigurationHandler { (textField) -> Void in
        textField.placeholder = "Destination?"
    }


    let createRouteAction = UIAlertAction(title: "Create Route", style: UIAlertActionStyle.Default) { (alertAction) -> Void in
        let origin = (addressAlert.textFields![0] as! UITextField).text as String
        let destination = (addressAlert.textFields![1] as! UITextField).text as String

        self.mapTasks.getDirections(origin, destination: destination, waypoints: nil, travelMode: nil, completionHandler: {

(status, success) -> Void in if success { self.configureMapAndMarkersForRoute() self.drawRoute() self.displayRouteInfo() } else { println(status) } }) }

    let closeAction = UIAlertAction(title: "Close", style: UIAlertActionStyle.Cancel) { (alertAction) -> Void in

    }

    addressAlert.addAction(createRouteAction)
    addressAlert.addAction(closeAction)

    presentViewController(addressAlert, animated: true, completion: nil)
}

• Drawing Route Between Two Places on GMSMapView in iOS

First, get all points coordinates which are coming in route then add these points latitude and longitude in path in will draw path according to that

     GMSCameraPosition *cameraPosition=[GMSCameraPosition cameraWithLatitude:18.5203 longitude:73.8567 zoom:12];
        _mapView =[GMSMapView mapWithFrame:CGRectZero camera:cameraPosition];
        _mapView.myLocationEnabled=YES;
        GMSMarker *marker=[[GMSMarker alloc]init];
        marker.position=CLLocationCoordinate2DMake(18.5203, 73.8567);
        marker.icon=[UIImage imageNamed:@"aaa.png"] ;
        marker.groundAnchor=CGPointMake(0.5,0.5);
        marker.map=_mapView;
        GMSMutablePath *path = [GMSMutablePath path];   
        [path addCoordinate:CLLocationCoordinate2DMake(@(18.520).doubleValue,@(73.856).doubleValue)];
        [path addCoordinate:CLLocationCoordinate2DMake(@(16.7).doubleValue,@(73.8567).doubleValue)];

        GMSPolyline *rectangle = [GMSPolyline polylineWithPath:path];
        rectangle.strokeWidth = 2.f;
        rectangle.map = _mapView;
        self.view=_mapView;

希望这有帮助!