ios - How to retrieve JSON data from webpage -
my webpage displays constructive data in single line, let app retrieve it.
json
[{"long":"1234..45","lat":"345.12"}] this information in page, click here see: http://www.gogrex.com/sandbox/startloc.json
how retrieve app json? have looked thru many examples still cannot solve it.
swift 3.x
class viewcontroller: uiviewcontroller { override func viewdidload() { super.viewdidload() // create url let geturl = url(string: "http://www.gogrex.com/sandbox/startloc.json")! // use urlsession data website urlsession.shared.datatask(with: geturl) { (data, response, error) in guard let data = data, error == nil else { print(error?.localizeddescription ?? "nil") return } // need serialize data using jsonserialization jsonobject(with:options) { if let jsonarray = try jsonserialization.jsonobject(with: data, options: .allowfragments) as? [any], let jsondict = jsonarray.first as? [string: any] { let latstring = jsondict["lat"] as? string let longstring = jsondict["long"] as? string print("latitude = ", latstring ?? "nil") // 345.12 print("longitude = ", longstring ?? "nil") // 1234..45 ( need fix value) print(double(latstring ?? "nil") ?? "nil") // optional(345.12) print(double(longstring ?? "nil") ?? "nil") // nil } } catch let error nserror { print(error.localizeddescription) } }.resume() } } swift 2.3
class viewcontroller: uiviewcontroller { override func viewdidload() { super.viewdidload() let geturl = nsurl(string: "http://www.gogrex.com/sandbox/startloc.json")! nsurlsession.sharedsession().datataskwithurl(geturl) { (data, response, error) in guard let data = data error == nil else { print(error?.localizeddescription) return } { if let jsonarray = try nsjsonserialization.jsonobjectwithdata(data, options: .allowfragments) as? [anyobject], let jsondict = jsonarray.first as? [string:anyobject] { let latstring = jsondict["lat"] as? string ?? "" let longstring = jsondict["long"] as? string ?? "" print("latitude = ", latstring) // 345.12 print("longitude = ", longstring) // 1234..45 ( need fix value) print(double(latstring)) // optional(345.12) print(double(longstring)) // nil } } catch let error nserror { print(error.localizeddescription) } }.resume() } } don't forget edit info.plist add web domain
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