Google geocoding

Question

Thanks for the tremendous helps, I was able to get lat and lng by using Google geocoding API with swift. If anyone encounters some problems, hope this helps!

here is the code.

var components = URLComponents(string: "https://maps.googleapis.com/maps/api/geocode/json")!
            let key = URLQueryItem(name: "key", value: "YOUR_KEY")
            let address = URLQueryItem(name: "address", value: TOKYO)
            components.queryItems = [key, address]

            let task = URLSession.shared.dataTask(with: components.url!) { data, response, error in

                guard let data = data, let httpResponse = response as? HTTPURLResponse, httpResponse.statusCode == 200, error == nil else {
                    print(String(describing: response))
                    print(String(describing: error))
                    return
                }

                guard let json = try! JSONSerialization.jsonObject(with: data) as? [String: Any] else {
                    print("not JSON format expected")
                    print(String(data: data, encoding: .utf8) ?? "Not string?!?")
                    return
                }

                guard let results = json["results"] as? [[String: Any]],
                    let geometry = results[0]["geometry"] as? [String:AnyObject],
                    let location = geometry["location"] as? [String:Double],
                    let lat = location["lat"],
                    let lng = location["lng"],
                    let status = json["status"] as? String,
                    status == "OK"
                    else{return}

Looks like there is a problem while converting this string to URL. Check if any special characters in url are converting weired/wrong — Sivajee Battina, Nov 21 '17 at 13:04
Mostly it will be problem with URLEncoding use stringByAddingPercentEscapesUsingEncoding — Sivajee Battina, Nov 21 '17 at 13:07
Sivajee Battina- thank you so much it worked!! but now another problem occured:( — Daibaku, Nov 21 '17 at 14:17
@Daibaku, how about selecting answer and/or upvoting answers? — user28434'mstep, Dec 15 '17 at 09:33

Ketan Parmar · Answer 1 · 2017-11-21T13:27:18.037

0

Take a look at,

 stringByAddingPercentEscapesUsingEncoding

for ios 8 and prior.

from ios 9,

   stringByAddingPercentEncodingWithAllowedCharacters

Your code should be like,

  let jsonUrl = "https://maps.googleapis.com/maps/api/geocode/json?address=Tokyo&key=Mykey"



   let yourFinalString = jsonUrl.addingPercentEncoding(withAllowedCharacters: .urlHostAllowed)

    guard URL(string:yourFinalString!) != nil else {

        return print("error")

    }

If your url string have some special characters then you have to escapes it by utf8 encoding!

edited Nov 21 '17 at 13:27

answered Nov 21 '17 at 13:07

Ketan Parmar

27,092
9
50
75

Thank you for the comment:) I didn't know how this works. Thank you so much again!! – Daibaku Nov 22 '17 at 00:37

score 0 · Answer 2 · answered Nov 21 '17 at 14:13

For constructing URLs with query params I recommend to use URLComponents:

var constructor = URLComponents()
constructor.scheme = "https"
constructor.host = "maps.googleapis.com"
constructor.path = "/maps/api/geocode/json"
constructor.queryItems = [
    URLQueryItem(name: "address", value: "Tokyo"),
    URLQueryItem(name: "key", value: "MyKey")
]
constructor.url // https://maps.googleapis.com/maps/api/geocode/json?address=Tokyo&key=MyKey

or

var constructor = URLComponents(string: "https://maps.googleapis.com/maps/api/geocode/json")
constructor?.queryItems = [
    URLQueryItem(name: "address", value: "Tokyo"),
    URLQueryItem(name: "key", value: "MyKey")
]
constructor?.url // https://maps.googleapis.com/maps/api/geocode/json?address=Tokyo&key=MyKey

It will format and escape all the characters internally, using proper allowed characters list.

cool, there is that kind of way!! Thank you so much, great stuff. I'll try it out!! — Daibaku, Nov 21 '17 at 14:28

score 0 · Accepted Answer · answered Nov 21 '17 at 15:16

Check this out:

var components = URLComponents(string: "https://maps.googleapis.com/maps/api/geocode/json")!
let key = URLQueryItem(name: "key", value: "AIzaSyCbFUri87RMHBX42AsOuxDQANeDCCK8LkA") // use your key
let address = URLQueryItem(name: "address", value: "Tokyo")
components.queryItems = [key, address]

let task = URLSession.shared.dataTask(with: components.url!) { data, response, error in

    guard let data = data, let httpResponse = response as? HTTPURLResponse, httpResponse.statusCode == 200, error == nil else {
        print(String(describing: response))
        print(String(describing: error))
        return
    }

    guard let json = try! JSONSerialization.jsonObject(with: data) as? [String: Any] else {
        print("not JSON format expected")
        print(String(data: data, encoding: .utf8) ?? "Not string?!?")
        return
    }

    guard let results = json["results"] as? [[String: Any]],
        let status = json["status"] as? String,
        status == "OK" else {
            print("no results")
            print(String(describing: json))
            return
    }
}

task.resume()

It perfectly worked!! Thank you so much!! How can I parse only "lat" and "lng"? I've been trying on my own but still can't figure it out. I'm sorry I'm pretty new in programming. hope you understand. — Daibaku, Nov 21 '17 at 16:51
Please accept the answer, so that it might helpful for another person like you. As you are new, please try to get values from dictionary, lat & lng. In worst case I will help you out. ;-) — Sivajee Battina, Nov 21 '17 at 18:05
I did sorry I didn't know how this works because this is my first time to ask a question. I'll do my best to work it out thank you so much again really appreciate it!! — Daibaku, Nov 22 '17 at 00:35

Google geocoding

3 Answers3