Swift JSON cannot get second variable - ios

Question

I built a backend API to my app in Laravel (PHP). The return from the method I am calling (create user) is:
{"success":true,"userid":"23"}
but when accessing userid in Swift it returns a null? It can access the success variable.
Here is the code for my request:
// create the user
var request = NSMutableURLRequest(URL: NSURL(string: "http://localhost/laravel/myapi/public/createUser"))
var session = NSURLSession.sharedSession()
request.HTTPMethod = "POST"
var params = ["username":txtUsername.text, "email":txtEmail.text, "password":txtPassword.text] as Dictionary
var err: NSError?
request.HTTPBody = NSJSONSerialization.dataWithJSONObject(params, options: nil, error: &err)
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
var task = session.dataTaskWithRequest(request, completionHandler: {data, response, error -> Void in
// println("Response: \(response)")
var strData = NSString(data: data, encoding: NSUTF8StringEncoding)
println("Body: \(strData)")
var err: NSError?
let json = NSJSONSerialization.JSONObjectWithData(data, options: .AllowFragments & .MutableLeaves, error: &err) as NSDictionary
if(err) {
println(err!.localizedDescription)
}
else {
var success = json["success"] as? Int
if(success == 1) {
var id = json["userid"] as? Int
self.lblTaken.text = "\(id)"
}
}
})
task.resume()
the println("Body: \(strData)") prints out:
Body: {"success":true,"userid":"23"}
But when trying to access the userid variable, it returns nil
Am I doing something wrong when trying to access the userid?
UPDATE
if I print out:
println(json.valueForKey("userid"))
it prints out the userid, but if I assign it to the variable, the variable returns a null still

Answer 1

The userId comes as a string. So, the problem is, you try to cast a string to an integer using as? and fail.
From Apple docs:
The as? operator performs a conditional cast of the expression to the specified type. The as? operator returns an optional of the specified type. At runtime, if the cast succeeds, the value of expression is wrapped in an optional and returned; otherwise, the value returned is nil. If casting to the specified type is guaranteed to fail, a compile-time error is raised. For example, casting to a type that’s neither a subclass or superclass of the type of the expression is an error.