iOS - Parsing JSON Dictionary with NSJSONSerialization in Swift

Question

i am using my REST Webservice to get the JSON Data i want, this works as intended and prints:

 [{
    "name": "Event1",
    "genre": "Party",
    "subtitle": "subtitle1",
    "startDate": "2015-10-10",
    "location": "Anywhere"
  },
  {
    "name": "Event2",
    "genre": "Party",
    "subtitle": "subtitle2",
    "startDate": "2015-10-10",
    "location": "Anywhere"
  }]

So this seems to be an Array with 2 Elements which are Dictionaries.

I then tried to parse the JSON with NSJSONSerialization.

let data = str.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)

        do {
            let json = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as! [String: AnyObject]

            if let name = json["name"] as? [String]{
                print(name)
            }
        } catch let error as NSError {
            print("Failed to load: \(error.localizedDescription)")
        }

I do get this error:

Could not cast value of type '__NSCFArray' (0x1096c1ae0) to 'NSDictionary' (0x1096c1d60).

which seems pretty clear to me, but i just don't know how to solve it.

My goal would be to create "Event" Objects from my own class.

json is a array of dictionary. With that json["name"] you're assuming it's a dictionary, which is not. So json[0]['name"]? — Larme
– Larme, Commented Oct 19, 2015 at 22:11

Ric Santos · Accepted Answer · 2015-10-19 22:21:26Z

3

The result of the deserialization will be an array:

let data = str.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)

do {
    let dataArray = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as! NSArray

    for event in dataArray {
        print(event)
    }

} catch let error as NSError {
    print("Failed to load: \(error.localizedDescription)")
}

answered Oct 19, 2015 at 22:21

Ric Santos

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