Updating to swift 3 JSON file - ios

Question

Im updating my app to swift 3
I am getting a couple of errors
for (k, v): (AnyObject, AnyObject) in value {
Gets an NSDictionary.Iterator.Element is not convertable to (Anyobject, Anyobject)
Subsiquently Im getting this error
var artworks = [Artwork]()
func loadInitialData() {
// 1
let fileName = Bundle.main.path(forResource: "PublicArt", ofType: "json");
let data: Data = try! Data(contentsOf: URL(fileURLWithPath: fileName!), options: NSData.ReadingOptions(rawValue: 0))
// 2
var error: NSError?
let jsonObject: AnyObject!
do {
jsonObject = try JSONSerialization.jsonObject(with: data,
options: JSONSerialization.ReadingOptions(rawValue: 0))
} catch let error1 as NSError {
error = error1
jsonObject = nil
}
// 3
if let jsonObject = jsonObject as? [String: AnyObject], error == nil,
// 4
let jsonData = JSONValue.fromObject(jsonObject)?["data"]?.array {
for artworkJSON in jsonData {
if let artworkJSON = artworkJSON.array,
// 5
let artwork = Artwork.fromJSON(artworkJSON) {
artworks.append(artwork)
}
}
}
}
JsonObject produces 'Any' not the expected contextual result type
'AnyObject'
and
Argument type [String : AnyObject] does not conform to expected type
'AnyObject'
Im assuming this is an easy one but I havent coded in a year and would be very appreciative of the help
Thanks
Travis
UPDATE
So I just updated the code
but getting an error in the JSON.swift file
static func fromObject(_ object: AnyObject) -> JSONValue? {
switch object {
case let value as NSString:
return JSONValue.jsonString(value as String)
case let value as NSNumber:
return JSONValue.jsonNumber(value)
case _ as NSNull:
return JSONValue.jsonNull
case let value as NSDictionary:
var jsonObject: [String:JSONValue] = [:]
for (k, v): (AnyObject, AnyObject) in value {
if let k = k as? NSString {
if let v = JSONValue.fromObject(v) {
jsonObject[k as String] = v
} else {
return nil
}
}
}
return JSONValue.jsonObject(jsonObject)
case let value as NSArray:
var jsonArray: [JSONValue] = []
for v in value {
if let v = JSONValue.fromObject(v as AnyObject) {
jsonArray.append(v)
} else {
return nil
}
}
return JSONValue.jsonArray(jsonArray)
default:
return nil
}
}
}
error is:
nsdictionary.iterate.element '(aka (key: Any, value: Any)') is not
convertible to 'AnyObject, AnyObject)'
for code line
for (k, v): (AnyObject, AnyObject) in value {
Sorry for the late reply
Regards
Travis

Answer 1

You are using too much AnyObject aka it's-an-object-but-I-don't-know-the-type.
Since the JSON file is in your bundle you know exactly the types of all objects.
In Swift 3 a JSON dictionary is [String:Any] and a JSON array is [[String:Any]].
However I don't know the exact structure of the JSON and I don't know what JSONValue does – a third party library is actually not necessary – but this might be a starting point to get the array for key data.
func loadInitialData() {
let fileURL = Bundle.main.url(forResource: "PublicArt", withExtension: "json")!
do {
let data = try Data(contentsOf: fileURL, options: [])
let jsonObject = try JSONSerialization.jsonObject(with: data) as! [String: Any]
let jsonData = jsonObject["data"] as! [[String:Any]]
for artworkJSON in jsonData {
print(artworkJSON)
// ... create Artwork items
}
} catch {
print(error)
fatalError("This should never happen")
}
}