Load JSON file in Swift 3

loadJSON.swift

func loadJSON(file: String, handler: (NSDictionary) -> Void){
        if let path = Bundle.main.path(forResource: file, ofType: "json") {
            do {
                let jsonData = try NSData(contentsOfFile: path, options: NSData.ReadingOptions.mappedIfSafe)
                do {
                    let json: NSDictionary = try JSONSerialization.jsonObject(with: jsonData as Data
                        , options: JSONSerialization.ReadingOptions.mutableContainers) as! NSDictionary
                    handler(json)
                } catch {
                    print("Parse json failed")
                }
            } catch {
                print("Load json failed")
            }
        } else {
            print("\(file).json open failed")
        }
    }