How can I get data from JSON array in SWIFT?

Question

from this link I would like to get the commonName

I tried this but it didn't work?!

let commonName = object["toLocationDisambiguation"][0]["disambiguationOptions"][1]["place"][2]["commonName"].stringValue

try this http://stackoverflow.com/questions/8908496/how-to-retrieve-data-from-json-array-and-display-in-textview — Ankam
– Ankam, Commented Feb 21, 2016 at 23:01

paulvs · Accepted Answer · 2016-02-22 00:16:18Z

1

Option 1 (Normal)

if let toLocationDisambiguation = object["toLocationDisambiguation"] as? Dictionary<String, AnyObject> {
    if let disambiguationOptions = toLocationDisambiguation["disambiguationOptions"] as? Array<AnyObject> {
        if let first = disambiguationOptions.first as? [String: AnyObject] {
            if let place = first["place"] as? [String: AnyObject] {
                let commonName = place["commonName"] as! String
                print("Common Name: ", commonName)
            }
        }
    }
}

Option 2 (Type Aliases)

typealias MyDictionary = [String: AnyObject]
typealias MyArray = [MyDictionary]

if let toLocationDisambiguation = object["toLocationDisambiguation"] as? MyDictionary {
    if let disambiguationOptions = toLocationDisambiguation["disambiguationOptions"] as? MyArray {
        if let first = disambiguationOptions.first {
            if let place = first["place"] as? MyDictionary {
                let commonName = place["commonName"] as! String
                print("Common Name: ", commonName)
            }
        }
    }
}

Option 3 (SwiftyJSON for Objective-C like syntax)

Take a look at SwiftyJSON.

let object = try! NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.AllowFragments) as! Dictionary<String, AnyObject>
let json = JSON(object)
let commonName = json["toLocationDisambiguation"]["disambiguationOptions"][0]["place"]["commonName"].stringValue
print("Common Name: ", commonName)

edited Feb 22, 2016 at 0:16

answered Feb 21, 2016 at 22:12

paulvs

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5 Comments

jarv81178 Over a year ago

I am using SwiftyJSON so I tried what you suggested:

if let disambiguations = object["toLocationDisambiguation"] as? MyArray {                 if let commonName = disambiguations.first as? MyDictionary {                     let commonName = object["commonName"].stringValue                 }             }

now I get the error: downcast form 'MyDictionay?' to 'MyDictionary'

paulvs Over a year ago

I fixed my code. Basically, get rid of the as? MyDictionary as it's unnecessary.

jarv81178 Over a year ago

thanks but I'm really stuck, not sure how I'm supposed to use your syntax

for (_,object):(String, JSON) in readableJSON {             typealias MyDictionary = [String: AnyObject]             typealias MyArray = [MyDictionary]             if let disambiguations = object["toLocationDisambiguation"] as? MyArray {                 if let first = disambiguations.first {                    let commonName = disambiguations                   NSLog("Dis: \(disambiguations)")                 }             }             commonNameArray.append(commonName)             NumberOfRows = commonNameArray.count

paulvs Over a year ago

Sorry if I confused things, I fixed my answer now.

jarv81178 Over a year ago

thanks, the SwiftyJSON one worked although it's not looping in my for loop

let jsonData = NSData(contentsOfURL: url!) let readableJSON = JSON(data: jsonData!, options: NSJSONReadingOptions.MutableContainers, error: nil) let object = try! NSJSONSerialization.JSONObjectWithData(jsonData!, options: NSJSONReadingOptions.AllowFragments) as! Dictionary<String, AnyObject> let json = JSON(object) for (_,object):(String, JSON) in readableJSON { let commonName = json["toLocationDisambiguation"]["disambiguationOptions"][0]["place"]["commonName"].stringValue commonNameArray.append(commonName)

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