如何从嵌套数组返回值-Swift 3

Question

My api query is returning several values in an array (as below), which I need to use for further functions. How do I retrieve the value 60, which is nested?

My code eg let uid = value["uid"] as? String let uid = value["uid"] as? String works well to return uid and name. But for let rest = value["field_resting_bpm"] as? String let rest = value["field_resting_bpm"] as? String it returns nil.

How do I correct this line to return the nested value '60'?:

 let rest = value["field_resting_bpm"] as? String'

the api query is:

    let credentialData = "\(user):\(password)".dataUsingEncoding(NSUTF8StringEncoding)!
    let base64Credentials = credentialData.base64EncodedStringWithOptions([])
    let headers = ["Authorization": "Basic \(base64Credentials)"]

var checkUserEndpoint: String = " https://example.site/ios1/user/1.json "

   Alamofire.request(.GET, checkUserEndpoint, parameters: nil, headers: headers, encoding: .JSON)
        .responseJSON { response in
            guard response.result.error == nil else {
                print("ran alamofire")
                //got an error in getting the data, need to handle it
                print("error calling GET")
                print(response.result.error!)
                return
            }

            guard let value = response.result.value else {
                print("no result data received when calling GET")
                return
            }
            // return UID
            print("ran alamofire")
            var datareturned = JSON(value)
            print("VALUE: \(value)")

it returns this in my console:

 uid = 1;
 name = "Guest User";
"field_resting_bpm" =     {
    und =         (
                    {
            value = 60;
        }
    );

UPDATE: this field is an Integer in Drupal user account settings. I have added a text field (so it should return a string), named field_rest_bpm_string, also for testing

the json on the site returns:

"field_resting_bpm":{"und":[{"value":"60"}]},"field_rest_bpm_string":{"und":[{"value":"65","format":null,"safe_value":"65"}]}

Answer 1

NOTE : Code is in Swift 3 but you can easily convert that in swift 2. SwiftyJSON version code is same in 2 and 3.

If you are using SwiftyJSON then things are pretty much simpler

let value = datareturned["field_resting_bpm"]["und"][0]["value"].stringValue
print(value)

If you are not using SwiftyJSON

let rest = value["field_resting_bpm"] as? NSDictionary
let und = (rest?.value(forKey: "und") as! NSArray).object(at: 0) as! NSDictionary
let yourValue = und.value(forKey: "value") as! String

Something like this.