Drawing directions from google map api - ios

Question

I am trying to draw a direction line from marker to another. I already turned on directions in google map api. I got this function in here (SO). I understand what its doing but I can not get it to work. The routes array returns empty. I have tried multiple points for tests. Here is the functions:
func drawPath2(origin: CLLocationCoordinate2D, destination: CLLocationCoordinate2D)
{
let origin = "\(origin.latitude),\(origin.longitude)"
let destination = "\(destination.latitude),\(destination.longitude)"
let apiKey = "Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
guard let url = URL(string: "https://maps.googleapis.com/maps/api/directions/json?origin=\(origin)&destination=\(destination)&key=AIzaSyAOhiBw8mSPBmmAJQ_fjM79x7ruvMxFmxQ") else {return}
Alamofire.request(url).responseJSON { response in
print(response.request) // original URL request
print(response.response) // HTTP URL response
print(response.data) // server data
print(response.result) // result of response serialization
let json = try! JSON(data: response.data!)
let routes = json["routes"].arrayValue
//remove this after test
print(routes.count)
for route in routes
{
let routeOverviewPolyline = route["overview_polyline"].dictionary
let points = routeOverviewPolyline?["points"]?.stringValue
let path = GMSMutablePath.init(fromEncodedPath: points!)
let polyline = GMSPolyline.init(path: path)
polyline.map = self.mapView
}
}
}
Here is the print() results:
Optional(https://maps.googleapis.com/maps/api/directions/json?origin=49.18705,-123.107261&destination=49.1844,-123.1052&mode=driving&key=AIzaSyAOhiBw8mSPBmmAJQ_fjM79x7ruvMxFmxQ)
Optional(<NSHTTPURLResponse: 0x6000024c5ba0> { URL: https://maps.googleapis.com/maps/api/directions/json?origin=49.18705,-123.107261&destination=49.1844,-123.1052&mode=driving&key=AIzaSyAOhiBw8mSPBmmAJQ_fjM79x7ruvMxFmxQ } { Status Code: 200, Headers {
"Cache-Control" = (
"no-cache, must-revalidate"
);
"Content-Encoding" = (
gzip
);
"Content-Length" = (
130
);
"Content-Type" = (
"application/json; charset=UTF-8"
);
Date = (
"Mon, 10 Dec 2018 22:28:52 GMT"
);
Expires = (
"Fri, 01 Jan 1990 00:00:00 GMT"
);
Pragma = (
"no-cache"
);
Server = (
mafe
);
Vary = (
"Accept-Language"
);
"alt-svc" = (
"quic=\":443\"; ma=2592000; v=\"44,43,39,35\""
);
"x-frame-options" = (
SAMEORIGIN
);
"x-xss-protection" = (
"1; mode=block"
);
} })
Optional(129 bytes)
SUCCESS
0
I do not see data in there at all. I think something is wrong with URL or request. Please help me sirs and madams.

Answer 1

I suspect, your api key is not authorized to use this service. You can verify by printing json
print(json)
You should see this in response where the routes array is empty,
{
"error_message" = "This API project is not authorized to use this API.";
routes = (
);
status = "REQUEST_DENIED";
}

Answer 2

Go to Google cloud console and create a new project and enable Direction API. API Libary
And Place your API Key in your url
See this Link It helps you for sample API and Response for Google Direction API.