Get data from JSON file with iOS and swift

Question

I have this JSON file:

      var Point :

      [   
         {
         "id": 1,
         "name": "A",
         "LastUpdate": 1468011600,
         "position": [36.8656974, 10.1687314]},

         {
         "id": 1,
         "name": "A",
         "LastUpdate": 1468397003,
         "position": [36.9009882, 10.3009531]
         },
         {
         "id": 1,
         "name": "A",
         "LastUpdate": 1467590490,
         "position": [37.1691357, 10.0349865]
         }
          ]

and I need to read this data in my viewController, I tried to work with SwiftyJSON but I failed. PS: I code with swift and not objective-C Any solutions?

You can use `NSJSONSerialization` to transform the String JSON into a Array. — Larme, Aug 08 '16 at 11:07
yeah, but that didn't work with me.. do { let jsonDictionary = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as! [String: AnyObject] completion(jsonDictionary) } catch let error { print("JSON Serialization failed. Error: \(error)") } — Ben Mustapha Sabrine, Aug 08 '16 at 11:14
Does the data start with "var Point :" ? Isn't it "var Point =" ? — OOPer, Aug 08 '16 at 11:18
You deserialized it as a Dictionary when at top level it's an array ! So `let jsonArray = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as! [AnyObject]` instead? — Larme, Aug 08 '16 at 11:18

score 1 · Answer 1 · answered Aug 08 '16 at 13:50

Why not simply using Alamofire. It's simple framework and you can install it using Cocoa pods. Here is the example of using Alamofire:

Alamofire.request(.GET, "https://httpbin.org/get", parameters: ["foo": "bar"])
         .responseJSON { response in
             print(response.request)  // original URL request
             print(response.response) // URL response
             print(response.data)     // server data
             print(response.result)   // result of response serialization

             if let JSON = response.result.value {
                 print("JSON: \(JSON)")
             }
         }

LIH · Answer 2 · 2016-08-08T11:30:00.580

0

Try this to convert string to NSDictionary

func convertStringToDictionary(text: String) -> [String:AnyObject]? {
  if let data = text.dataUsingEncoding(NSUTF8StringEncoding) {
    do {
        return try NSJSONSerialization.JSONObjectWithData(data, options: []) as? [String:AnyObject]
    } catch let error as NSError {
        print(error)
    }
  }
  return nil
}

To remove the syntax errors from your submitted code replace curly braces with square brackets.

var Point = [   
     [
     "id": 1,
     "name": "A",
     "LastUpdate": 1468011600,
     "position": [36.8656974, 10.1687314]],

     [
     "id": 1,
     "name": "A",
     "LastUpdate": 1468397003,
     "position": [36.9009882, 10.3009531]
     ],
     [
     "id": 1,
     "name": "A",
     "LastUpdate": 1467590490,
     "position": [37.1691357, 10.0349865]
     ]
  ]

edited Aug 08 '16 at 11:30

answered Aug 08 '16 at 11:15

LIH

933
2
10
25

Deserializing the particular JSON in the question will return `nil`. – vadian Aug 08 '16 at 11:17
Yes, because that's not a valid json object. It's root is missing. try to wrap it like this. `{"root":"your existing string"}`. To be more specific, `{"root":"[ {"id": 1, "name": "A",...}, ... ]"}`. – LIH Aug 08 '16 at 11:19
1

Apart from the confusion that the JSON doesn't match the variable declaration the root object of JSON is not required to be a dictionary. – vadian Aug 08 '16 at 11:22
Your problem is, your submitted code give syntax errors? – LIH Aug 08 '16 at 11:25
Use `try?` instead of `do {try...} catch{...}`. – kabiroberai Aug 08 '16 at 11:32
https://stackoverflow.com/a/30480777/2227743 – Eric Aya Mar 13 '21 at 10:38

RrrangeTop · Accepted Answer · 2016-08-08T11:43:53.723

0

You can use this great library. This library provide parsing from JSON to Dictionary very simple (just 1-2 line of code).

P.S. Also i recommended use this library to mapping Dictionary to Object

UPDATE To install swiftyJSON in podfile

platform :ios, '8.0'
use_frameworks!

pod 'SwiftyJSON'

Then sudo pod install

edited Aug 08 '16 at 11:43

answered Aug 08 '16 at 11:17

RrrangeTop

312
1
10

i can't install swiftyJSON :( -bash: pod: command not found – Ben Mustapha Sabrine Aug 08 '16 at 11:20
You can download sources from github or [install pods](https://cocoapods.org) – RrrangeTop Aug 08 '16 at 11:22
i installed COCOAPODS and then i created the podfile, then? – Ben Mustapha Sabrine Aug 08 '16 at 11:39
Then in podfile write `platform :ios, '8.0' use_frameworks! pod 'SwiftyJSON'` Important **use_frameworks!** and then `sudo pod install` – RrrangeTop Aug 08 '16 at 11:41
I got this: sudo: pod: command not found – Ben Mustapha Sabrine Aug 08 '16 at 11:45
Hm.., [this](http://stackoverflow.com/a/14204067/3551959) post tell to upgrade Ruby and [this post](http://stackoverflow.com/questions/32810808/can-not-perform-pod-install-under-el-capitan-15a279b) tell how fix for Cocoapods error on El Capitan – RrrangeTop Aug 08 '16 at 11:55
that works! thank you – Ben Mustapha Sabrine Aug 09 '16 at 08:10

Get data from JSON file with iOS and swift

3 Answers3