PROSAGA码农传奇-数据沙盘-如何从网页中检索JSON数据

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    的
      Swift 3.x
    </强>
  
   <pre>
 <code>
 class ViewController: UIViewController {
 override func viewDidLoad() {
 super.viewDidLoad()
 // create your get url
 let getURL = URL(string: "http://www.gogrex.com/Sandbox/startloc.json")!
 // use URLSession to get the data from your website
 URLSession.shared.dataTask(with: getURL) { (data, response, error) in
 guard let data = data, error == nil else {
 print(error?.localizedDescription ?? "nil")
 return
 }
 // you need to serialize your data using JSONSerialization jsonObject(with:options)
 do {
 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 ( you need to fix this value)
 print(Double(latString ?? "nil") ?? "nil") // Optional(345.12)
 print(Double(longString ?? "nil") ?? "nil") // nil
 }
 } catch let error as NSError {
 print(error.localizedDescription)
 }
 }.resume()
 }
}

</code>
 </pre>
  
    的
      斯威夫特2.3
    </强>
  
   <pre>
 <code>
 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 where error == nil else {
 print(error?.localizedDescription)
 return
 }
 do {
 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 ( you need to fix this value)
 print(Double(latString)) // Optional(345.12)
 print(Double(longString)) // nil
 }
 } catch let error as NSError {
 print(error.localizedDescription)
 }
 }.resume()
 }
}

</code>
 </pre>
  
    不要忘记编辑info.plist以添加您的网域
  
  
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