Cannot index a value of 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 will not allow me to compile, and if I get this error message in red:

You cannot index a value of type AnyObject with an index of type String

When you display the contents of jParams in a log using 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 JSON processing to solve these 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 editing, it looks like you are using SwiftyJSON.

If this is true, you can help the compiler find out what's in the dictionary using the SwiftyJSON dictionaryValue property:

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

Then you should have access to your values ​​without downcasting:

 let title = jParams["title"] 

because SwiftyJSON will output the correct type for the values.