Swift JSON for-in循环

Question

I am trying to loop trough a serie of items in a JSON object. However I run into some problems. My code compiles fine without errors but when it gets to the point where the JSON function triggers in stops emulating and gives an error.

This is my code:

func getJSON() {
        let urlAsString = "http://localhost:8888/domainchecker/check.php?domain=/google.com"
        let url = NSURL(string: urlAsString)!
        let urlSession = NSURLSession.sharedSession()

        let jsonQuery = urlSession.dataTaskWithURL(url, completionHandler: { data, response, error -> Void in
            if (error != nil) {
                println(error.localizedDescription)
            }
            var err: NSError?

            var jsonResult = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &err) as NSDictionary
            if (err != nil) {
                println("JSON Error \(err!.localizedDescription)")
            }

            let arrayFromJson: String! = jsonResult["ITEMS"] as NSString

            dispatch_async(dispatch_get_main_queue(), {
                for variable in arrayFromJson {
                    println("DOMAIN");
                }

            })
        })
        jsonQuery.resume()
    }

This is the JSON result:

{ "ITEMS": [ { "DOMAIN": "google.nl", "AVAILABLE": "NO", "PRICE": "-" }{ "DOMAIN": "google.com", "AVAILABLE": "NO", "PRICE": "-" }{ "DOMAIN": "google.eu", "AVAILABLE": "NO", "PRICE": "-" } ] }

and this is the error we receive:

fatal error: unexpectedly found nil while unwrapping an Optional value
(lldb)

I have been searching the web for a fix or alternatives, but to no avail.

Thanks in advance.

Answer 1

在您的JSON结构中， jsonResult["ITEMS"]不是您声明的字符串，而是一个字典数组，因此您必须将其视为字典数组

let arrayFromJson: [[String:AnyObject]] = jsonResult["ITEMS"] as [[String:AnyObject]]