SwiftでJSONを取得するサンプル

get_json.swift

let url = NSURL(string: "http://example.com/json/")!

let task = NSURLSession.sharedSession().dataTaskWithURL(url) { (data, response, error) -> Void in
    if error != nil { print(error) }
    else {
        //print(NSString(data: data!, encoding: NSUTF8StringEncoding))
        do {
            // json to NSDictionary
            let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as! NSDictionary

            // access data
            if jsonResult.count > 0 {
                if let items = jsonResult["Items"] as? NSArray {
                    for item in items {
                        if let title = item["title"] as? String {
                            let update = item["update"] as! String
                        }
                    }
                } //if let items = jsonResult["Items"] as? NSArray {
            } // if jsonResult.count > 0 {
        } catch { print("JSON serialization Failed!") }
    }
}
task.resume() // よく忘れる