JSON / NSJSONSerialization 的 Swift 问题

Question

我正在尝试在 Swift 中读取此 JSON 文件并将数据存储在 NSDictionary 中，我希望将 name 作为 key 和 directory 作为值。

{
 "subjects": [
  { "prefix":"", "name":"mada" , "directory":"E1862_Unterrichte_I/E1862_2iCa" },
  { "prefix":"", "name":"oopI2" , "directory":"E1862_Unterrichte_I/E1862_2iCa" },
  { "prefix":"", "name":"req" , "directory":"E1862_Unterrichte_I/E1862_2iCa" },
  { "prefix":"", "name":"ws2C" , "directory":"E1862_Unterrichte_I/E1862_2iCb" },
  { "prefix":"", "name":"sprx" , "directory":"E1868_Unterrichte_Kontext/E1868_8KKa15" },
  { "prefix":"", "name":"etw", "directory":"E1868_Unterrichte_Kontext/E1868_8KEd" },
  { "prefix":"", "name":"infre", "directory":"E1868_Unterrichte_Kontext/E1868_8KGc"}
 ]
}

为了实现这一点，我正在使用 NSJSONSerialization：

let data = NSData.dataWithContentsOfFile("subjects.json", options: .DataReadingMappedIfSafe, error: nil)

var error: NSError?
let jsonDict = NSJSONSerialization.JSONObjectWithData(data, options: nil, error: &error) as NSDictionary

到目前为止，我可以读取文件，结果 NSDictionary 看起来像 ["subjects, "7 objects"]。不幸的是，我对如何实现我真正需要的东西一无所知("NSDictionary with name as key and directory as value").

Answer 1

您可以像这样提取所需的数据

if let subjects = jsonResult["subjects"] as? NSDictionary[] {
    for subject in subjects {
        // subject is an NSDictionary
        var prefix = subject["prefix"] as String
        var name = subject["name"] as String
        // etc
    }
} else {
    // There was no 'subjects' key in the dictionary
}