AnyObject to Array?

Question

I\'m using NSJSONSerialization as so:

let twData: AnyObject? = NSJSONSerialization.JSONObjectWithData(responseData, options: NSJSONReadingOption         


        

Answer 1

To cast your data to an array:

var twDataArray = (twData as! NSArray) as Array

The code above first casts twData to an NSArray, and then to an Array via a bridging cast. A bridging cast is a special type of cast which converts an Objective-C type to it's _ObjectiveCBridgeable conformant, Swift counterpart.

(Note that I didn't need to write Array because the element AnyObject is inferred in the bridging cast from NSArray → Array)

Note that the cast above is a forced downcast. Only use this if you're absolutely sure that twData is going to be an instance of NSArray. Otherwise, use an optional cast.

var twDataArray = (twData as? NSArray) as Array?