Cannot subscript a value of a type AnyObject, in Swift

Question

I have this line of code, and I want to extract the "title" key:

var title = jParams["title"] as! String

However it wont let me compile, and if I get this error message in red:

Cannot subscript a value of a type AnyObject with an index of type String

When show the contents of jParams in the log with println(jParams) I get the following content:

INCOMING LIST PARAMETERS (jParameters)
Optional({
    title = "Example List";
    values =     (
                {
            id = 1;
            name = "Line 1";
        },
                {
            id = 2;
            name = "Line 2";
        },
                {
            id = 3;
            name = "Line 3";
        }
    );
})

I am new to Swift so I am not familiar with the details of handling JSON to deal with these type of problems. What could be wrong?

//jParams comes from a JSON server response
var data = NSURLConnection.sendSynchronousRequest(request, returningResponse: nil, error: nil)
            if data != nil {
                var jdata = JSON(data: data!)
                var jParams=jdata["responseData"]["extraData"]["params"]

Answer 1

In your edit it looks like you're using SwiftyJSON.

If that is indeed the case, you can help the compiler to know what's in the dictionary by using SwiftyJSON's dictionaryValue property:

let jParams = jdata["responseData"]["extraData"]["params"].dictionaryValue

Then you should be able to access your values without downcasting:

let title = jParams["title"]

because SwiftyJSON will have inferred the right type for the values.