ios - 在谷歌地图 iOS SDK 中获取两点之间的路线

Question

我有以下代码来获取 Google map iOS SDK 中两点之间的路径。但是，我没有收到任何返回的数据，甚至没有收到任何错误。

let url = URL(string: "http://maps.googleapis.com/maps/api/directions/json?origin=\(latitude),\(longitude)&destination=\(finallat),\(finallong)&key=**************")
URLSession.shared.dataTask(with: url!) { (data:Data?, response:URLResponse?, error:Error?) in
    if let data = data {
        do {
            // Convert the data to JSON
            let jsonSerialized = try JSONSerialization.jsonObject(with: data, options: []) as? [String : Any]

            if let json = jsonSerialized, let url = json["url"], let explanation = json["explanation"] {
                print(url)
                print(explanation)
            }
        }  catch let error as NSError {
            print(error.localizedDescription)
        }
    } else if let error = error {
        print(error.localizedDescription)
    }
}

Answer 1

您没有对 dataTask 做任何事情，所以它实际上并没有被调用。您需要调用 resume()。

let url = URL(string: "http://maps.googleapis.com/maps/api/directions/json?origin=\(latitude),\(longitude)&destination=\(finallat),\(finallong)&key=**************")
let task = URLSession.shared.dataTask(with: url!) { (data:Data?, response:URLResponse?, error:Error?) in
    if let data = data {
        do {
            // Convert the data to JSON
            let jsonSerialized = try JSONSerialization.jsonObject(with: data, options: []) as? [String : Any]

            if let json = jsonSerialized, let url = json["url"], let explanation = json["explanation"] {
                print(url)
                print(explanation)
            }
        }  catch let error as NSError {
            print(error.localizedDescription)
        }
    } else if let error = error {
        print(error.localizedDescription)
    }
}
task.resume()