Twitter SLRequest Authentication Error - ios

Question

I have been trying to retrieve twitter user data utilizing the built in iOS Accounts and Twitter frameworks.
I am getting access to the user account on the phone successfully. However, when making the SLRequest to twitter I receive an non authenticated error. I was under the impression that assigning the user ACCount to the twitter SLRequest.account fulfilled the OAuth parts necessary.
Code is from test project I have set up
Any feedback is greatly appreciated!
var accountsArray = AnyObject
var account = ACAccount()
override func viewDidLoad() {
super.viewDidLoad()
let accountStore: ACAccountStore = ACAccountStore()
let twitterAccountType: ACAccountType = accountStore.accountTypeWithAccountTypeIdentifier(ACAccountTypeIdentifierTwitter)
let url = NSURL(string: "https://api.twitter.com/1.1/users/show.json")
let params: NSDictionary = ["field": "user_id, screen_name"]
accountStore.requestAccessToAccountsWithType(twitterAccountType, options: nil, completion: { (success, error) -> Void in
if success {
let account = accountStore.accountsWithAccountType(twitterAccountType)
if let userAccount = account.first as? ACAccount {
self.accountsArray.append(userAccount)
let twitterRequest = SLRequest(forServiceType: SLServiceTypeTwitter, requestMethod: SLRequestMethod.GET, URL: url, parameters: params as [NSObject : AnyObject])
From what i have found i thought the line below covered the OAuth requirement for twitter api version 1.1
twitterRequest.account = userAccount
twitterRequest.performRequestWithHandler({ (responseData : NSData?, urlResponse : NSHTTPURLResponse?, error : NSError?) -> Void in
print("data : \(responseData)")
if let response = responseData {
var dict = NSDictionary()
do {
dict = try! NSJSONSerialization.JSONObjectWithData(response, options: NSJSONReadingOptions.MutableContainers) as! NSDictionary
}
print(dict)
} else if error != nil {
print("Error : \(error)")
}
})
}
} else if (error != nil) {
print("nooope")
}
})
}
}
Whats returned from the dictionary:
{
errors = (
{
code = 50;
message = "User not found.";
}
);
}

Answer 1

params dictionary should be:
["screen_name": "username"]