我试图将Objc转换为快速转换，并且过得更好。
我有一个带字典的课程：
collaborationDictionary:[String:Set<String>]
我正在尝试向/从文件中写入/读取此词典，但似乎无法使其正常工作。我必须使用以下JSON结构保存字典，我必须使用SwiftyJSON。
{ "Collaborations" : {
"5604" : [
"whiteboard.png",
"VID_20161123_135117.3gp",
"Photo_0.jpeg"]
"5603" : [
"VID_20161123_135117.3gp"],
"5537" : [
"Screenshot_20151212-132454.png",
"VID_20161202_083205.3gp",
"VID_20161123_135117.3gp",
"Photo_0.jpeg",
"Screenshot_20151212-132428.png",
"Screenshot_20151212-132520.png",
"IMG_20161017_132105.jpg",
"whiteboard.png"]}
}
查找/检索文件或编写文件时，我没有任何实际问题。我只是无法弄清楚如何手动加载SwiftyJSON。我需要一个名为＆＃34; Collaborations＆＃34;的JSON对象。在顶部。它需要包含协作ID字典（5604,5603 ......）。每个协作都包含一个字符串数组（文件名）。我包含了用于读取/写入文件的代码，但我需要有关SwiftyJSON库的帮助。
这是我用来存储上述数据的会员数据成员：
这些是我需要完成的功能：
private var collaborationDictionary:[String:Set<String>] = [:]
func getUploadedFileSet() {
collaborationDictionary = [:]
let documentsURL = URL(string: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0])
let appURL = documentsURL?.appendingPathComponent(APP_DISTINGUISHED_NAME)
let jsonFileURL = appURL?.appendingPathComponent(UPLOADED_ITEMS_DB_JSON)
if FileManager.default.fileExists(atPath: (jsonFileURL?.absoluteString)!) {
do {
let data = try Data(contentsOf: jsonFileURL!, options: .alwaysMapped)
let json = JSON(data: data)
// ************************************************
// NEED HELP START
// NOW WHAT???? What is the SwiftyJSON code
?????????????????????????
// NEED HELP END
// ************************************************
} catch let error {
print(error.localizedDescription)
}
}
}
func saveUploadedFilesSet() {
let documentsURL = URL(string: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0])
let appURL = documentsURL?.appendingPathComponent(APP_DISTINGUISHED_NAME)
let jsonFileURL = appURL?.appendingPathComponent(UPLOADED_ITEMS_DB_JSON)
do {
let dirExists = FileManager.default.fileExists(atPath: (appURL?.absoluteString)!)
if !dirExists {
try FileManager.default.createDirectory(atPath: (appURL?.absoluteString)!, withIntermediateDirectories: false, attributes: nil)
}
// ************************************************
// NEED HELP START
// NOW WHAT???? What is the SwiftyJSON code
?????????????????????????
// NEED HELP END
// ************************************************
// Write to file code - haven't written it yet but that should be easy
} catch let error as NSError {
print(error.localizedDescription);
}
}
任何方向都将不胜感激。谢谢！
修改
我能够弄清楚如何从文件加载提供的JSON结构。这是代码：
func getUploadedFileSet() {
let documentsURL = URL(string: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0])
let appURL = documentsURL?.appendingPathComponent(APP_DISTINGUISHED_NAME)
let jsonFileURL = appURL?.appendingPathComponent(UPLOADED_ITEMS_DB_JSON)
if FileManager.default.fileExists(atPath: (jsonFileURL?.absoluteString)!) {
do {
let data = try Data(contentsOf: jsonFileURL!, options: .alwaysMapped)
let json = JSON(data: data)
if json != nil {
for (key, subJson) in json[kCollaborations] {
let stringArray:[String] = subJson.arrayValue.map { $0.string! }
let stringSet = Set(stringArray)
collaborationDictionary.updateValue(stringSet, forKey: key)
}
} else {
print("Could not get json from file, make sure that file contains valid json.")
}
} catch let error {
print(error.localizedDescription)
}
}
我仍然没有想出如何将collaborationDictionary对象保存到文件中。我最大的问题是弄清楚如何加入＆＃34; Collaborations＆＃34;键。有什么想法吗？
答案 0 :(得分：5)
我终于开始工作了。最大的问题是我无法将collaborationDictionary转换为JSON。我最后不得不将它转换为数组字典与集合字典。以下是两种方法：
// **************************************************************************
func getUploadedFileSet() {
let documentsURL = URL(string: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0])
let appURL = documentsURL?.appendingPathComponent(APP_DISTINGUISHED_NAME)
let jsonFileURL = appURL?.appendingPathComponent(UPLOADED_ITEMS_DB_JSON)
if FileManager.default.fileExists(atPath: (jsonFileURL?.absoluteString)!) {
do {
let data = try Data(contentsOf: jsonFileURL!, options: .alwaysMapped)
let json = JSON(data: data)
if json != nil {
for (key, subJson) in json[kCollaborations] {
let stringArray:[String] = subJson.arrayValue.map { $0.string! }
let stringSet = Set(stringArray)
collaborationDictionary.updateValue(stringSet, forKey: key)
}
} else {
print("Could not get json from file, make sure that file contains valid json.")
}
} catch let error {
print(error.localizedDescription)
}
}
}
// **************************************************************************
func saveUploadedFilesSet() {
let documentsURL = URL(string: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0])
let appURL = documentsURL?.appendingPathComponent(APP_DISTINGUISHED_NAME)
let jsonFileURL = appURL?.appendingPathComponent(UPLOADED_ITEMS_DB_JSON)
let adjustedJSONFileURL = URL(fileURLWithPath:(jsonFileURL?.absoluteString)!)
do {
let dirExists = FileManager.default.fileExists(atPath: (appURL?.absoluteString)!)
if !dirExists {
try FileManager.default.createDirectory(atPath: (appURL?.absoluteString)!, withIntermediateDirectories: false, attributes: nil)
}
// Convert set elements to arrays
var convertedCollaborationDictionary: [String:[String]] = [:]
for (sessionID, fileNameSet) in collaborationDictionary {
let array = Array(fileNameSet)
convertedCollaborationDictionary.updateValue(array, forKey: sessionID)
}
let json: JSON = JSON(convertedCollaborationDictionary)
let fullJSON: JSON = [kCollaborations:json.object]
let data = try fullJSON.rawData()
try data.write(to: adjustedJSONFileURL, options: .atomic)
} catch let error as NSError {
print(error.localizedDescription);
}
}
答案 1 :(得分：2)
如果你深入了解源代码，SwiftyJSON包含JSONSerialization，它可以被初始化并转换回Data，它知道如何从磁盘读取和写入自己：
func readJSON() -> JSON? {
guard let url = Bundle.main.url(forResource: "data", withExtension: "json"),
let data = try? Data(contentsOf: url) else {
return nil
}
return JSON(data: data)
}
func write(json: JSON, to url: URL) throws {
let data = try json.rawData()
try data.write(to: url)
}
请注意，您可以从包括Bundle在内的任何位置加载静态数据，但只能写入沙箱（即Documents目录）。如果您打算阅读/写入同一文件，您可能希望在首次运行时从Bundle复制到文档目录。
你的样本JSON也不好（lint它）。在“Photo_0.jpeg”]
之后你需要一个逗号