Casting JSON data in Swift

Question

I'm getting some JSON data from a server that I've parsed to a dictionary. Now I want to get the data from the dictionary and cast it as different types but I get some errors.

I've tried

let manager = AFHTTPRequestOperationManager()
manager.requestSerializer = AFJSONRequestSerializer()
manager.GET(
    "http://localhost/example/jsonpage",
    parameters: nil,
    success: { (operation: AFHTTPRequestOperation!,
        responseObject: AnyObject!) in

        if let data = responseObject as? Dictionary<String, AnyObject> {
            let id = data["id"] as? Int
            let persons = data["persons"] as? Dictionary<String, AnyObject>
        }


    },
    failure: { (operation: AFHTTPRequestOperation!,
        error: NSError!) in
        println("Error: " + error.localizedDescription)
    }
)

These gives me an error:

let id = data["id"] as? Int
let persons = data["persons"] as? Dictionary<String, AnyObject>

Error: Could not find an overload for 'subscript' that accepts the supplied arguments

Answer 1

The responseObject is of Type NSDictionary, and the supported JSON value Types are NSDictionary, NSArray, NSString, NSNumber. Casting to Dictionary does not cast its values to the correct Type. You have to cast the values individually.

if let nsid: NSNumber = data["id"] as? NSNumber {
    var id = Int(nsid)
}