Swift 到 Swift 3 次代码转换：读取 JSON 个文件

Question

我有这段代码可以读取 JSON 文件，我正在尝试将这些文件移入 Swift 3 环境。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
}

Xcode 给出了修复一些错误的建议（因为一些对象和类已被重命名），结果是：

do {
    //Problem here: parameters don't match overrides
    let dictionary = try JSONSerialization.jsonObject(dataOK as Data, options: JSONSerialization.ReadingOptions()) as AnyObject!
    dictionaryOK = (dictionary as! NSDictionary as? Dictionary <String, AnyObject>)!
}
catch {
    print("Level file '\(filename)' is not valid JSON: \(error)")
    return nil
}

它不匹配任何 jsonObjects 覆盖（它说）。我检查了文档，其中说 jsonObjects 的参数应该是：

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

我做错了什么？

Answer 1

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)
}

Swift 到 Swift 3 次代码转换：读取 JSON 个文件

Swift to Swift 3 code conversions: Reading JSON files

error-handling

json

swift

swift3