Swift到Swift 3代码转换：读取JSON文件

我有这段代码用于读取JSON文件，我正在尝试将其移动到Swift 3环境中。这是：

do {
    let dictionary = try NSJSONSerialization.JSONObjectWithData(dataOK, options: NSJSONReadingOptions()) as AnyObject!
        dictionaryOK = (dictionary as! NSDictionary as? Dictionary <String, AnyObject>)!
  }
catch {
    print("Level file '\(filename)' is not valid JSON: \(error)")
    return nil
}

---

我做错了什么？

您的Swift 2代码一开始就非常冗长

试试这个：

do {
    if let dictionaryOK = try JSONSerialization.jsonObject(with: dataOK, options: []) as? [String: AnyObject] {
        // parse JSON
    }
} catch {
    print(error)
}

class func jsonObject(with data: Data, 
           options opt: JSONSerialization.ReadingOptions = []) throws -> AnyObject

do {
    if let dictionaryOK = try JSONSerialization.jsonObject(with: dataOK, options: []) as? [String: AnyObject] {
        // parse JSON
    }
} catch {
    print(error)
}