以前用OC做項目的，用戶信息的存儲都是放在Documents文件下的plist文件?，F(xiàn)在在學(xué)Swift，感覺用Swift寫始終有點別扭。下面寫下來，不足的地方還請大家指正。稍后慢慢把coreData補(bǔ)起來。

//MARK:- 獲取plist文件內(nèi)容
func readDictionaryPlistForKey(searchPathDirectory:FileManager.SearchPathDirectory,fileName:String) -> NSMutableDictionary
{
    let searchPath = NSSearchPathForDirectoriesInDomains(searchPathDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)
    let plistPath = searchPath[0] + "/" + fileName + ".plist"
    let dic = NSMutableDictionary(contentsOfFile:plistPath)
    
    if dic == nil
    {
        return NSMutableDictionary()
    }
    return dic!
}

//MARK:- 獲取Documents目錄下文件路徑
func documentFilePath(fileName:String) -> String
{
    // /Library/
    let path = NSHomeDirectory() + "/Documents/" + fileName
    return path
}

//MARK:- 判斷文件夾是否存在
func fileExistAtPath(filePath:String) -> Bool
{
    if (FileManager.default.fileExists(atPath: filePath))
    {
        return true
    }
    return false
}

//MARK:- 刪除文件
func deleteFile(filePath:String)
{
    if (fileExistAtPath(filePath: filePath))
    {
        let fileUrl = URL(fileURLWithPath:filePath)
        try! FileManager.default.removeItem(at: fileUrl)
    }
}

//MARK:- 創(chuàng)建文件夾
func creatFile(filePath:String)
{
    if !FileManager.default.fileExists(atPath: filePath)
    {
        let fileUrl = URL(fileURLWithPath:filePath)
        // TODO withIntermediateDirectories 參數(shù)為true 表示文件路徑不存在 也會創(chuàng)建
        try! FileManager.default.createDirectory(at: fileUrl, withIntermediateDirectories: true, attributes: nil)
    }
}

//MARK:- 二進(jìn)制寫入文件
func writeToFile(data:Data,fileName:String)
{
    let filePath = documentFilePath(fileName: fileName)
    creatFile(filePath: filePath)
    let fileUrl = URL(fileURLWithPath:filePath)
    try! data.write(to: fileUrl)
}

//MARK:- 將資源文件的寫入文件
func writeDataToFile(fileName:String,fileType:String,searchPathDirectory:FileManager.SearchPathDirectory)
{
    let searchPath = NSSearchPathForDirectoriesInDomains(searchPathDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)
    let filePath = searchPath[0] + "/" + fileName + "." + fileType
    
    if  !FileManager.default.fileExists(atPath: filePath)
    {
        let defaultFilePath = Bundle.main.path(forResource: fileName, ofType: fileType)
        try! FileManager.default.copyItem(atPath: defaultFilePath!, toPath: filePath)
    }
}

//MARK:- 創(chuàng)建或向已存在的plist文件寫數(shù)據(jù)
func updatePlist(searchPathDirectory:FileManager.SearchPathDirectory,fileName:String,infoDic:NSDictionary)
{
    let searchPath = NSSearchPathForDirectoriesInDomains(searchPathDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)
    let plistPath = searchPath[0] + "/" + fileName + ".plist"
    if !FileManager.default.fileExists(atPath: plistPath)
    {
        FileManager.default.createFile(atPath: plistPath, contents: nil, attributes: nil)
    }
    infoDic.write(toFile: plistPath, atomically: true)
}

//MARK:- 獲取plist文件根目錄某個字段
func readPlistForKey(searchPathDirectory:FileManager.SearchPathDirectory,fileName:String,key:String) -> String
{
    let dic : NSMutableDictionary = readDictionaryPlistForKey(searchPathDirectory: searchPathDirectory, fileName: fileName)
    let keyString = dic.object(forKey: key) as! String
    return keyString
}

//MARK:- 更新plist文件根目錄某個字段對應(yīng)的數(shù)據(jù)
func updatePlist(searchPathDirectory:FileManager.SearchPathDirectory,fileName:String,key:String,object:Any)
{
    let dic : NSMutableDictionary = readDictionaryPlistForKey(searchPathDirectory: searchPathDirectory, fileName: fileName)
    dic.setValue(object, forKey: key)
    updatePlist(searchPathDirectory: searchPathDirectory, fileName: fileName, infoDic: dic)
}



let USER_INFO          = "userInfo"
let USER_SETTING_INFO  = "userSettingInfo"

// localUserInfo.plist
let USER_INFO_LOCAL    = "localUserInfo"

// MARK: - 保存登錄信息，實際上是存在LocalUserInfo.plist文件里面，infoKey是對應(yīng)Key
func saveInfoToLocal(info:Any , infoKey:String)
{
    var userInfoDic = NSMutableDictionary()
    userInfoDic = readDictionaryPlistForKey(searchPathDirectory: .documentDirectory, fileName: USER_INFO_LOCAL)
    userInfoDic.setValue(info, forKey: infoKey)
    updatePlist(searchPathDirectory: .documentDirectory, fileName: USER_INFO_LOCAL, infoDic: userInfoDic)
}

//MARK: - 根據(jù)key來查找存放在LocalUserInfo.plist文件對應(yīng)的數(shù)據(jù)
func infoFromLocal(infoKey:String) -> Any
{
    let userInfoDic : NSMutableDictionary = readDictionaryPlistForKey(searchPathDirectory: .documentDirectory, fileName: USER_INFO_LOCAL)
    let object = userInfoDic.object(forKey: infoKey) as Any
    return object
}

//MARK: - 保存登錄時的用戶信息
func saveUserInfoToLocal(_ userInfoDic : NSDictionary)
{
    saveInfoToLocal(info: userInfoDic, infoKey: USER_INFO)
}

//MARK: - 返回保留的登錄信息
func userInfoFromLocal() -> NSDictionary
{
    let userInfoDic : NSDictionary = infoFromLocal(infoKey: USER_INFO) as! NSDictionary
    return userInfoDic
}

//MARK: - 保存本地設(shè)置
func saveSettingInfoToLocal(_ userInfoDic:NSDictionary)
{
    saveInfoToLocal(info: userInfoDic, infoKey: USER_SETTING_INFO)
}

//MARK: - 返回本地設(shè)置
func userSettingInfoFromLocal() -> NSDictionary
{
    let userInfoDic : NSDictionary = infoFromLocal(infoKey: USER_SETTING_INFO) as! NSDictionary
    return userInfoDic
}

使用就是這樣

let infoDic = ["name1":"Swift",
                       "name2":"OC"]
let NSDic = infoDic as NSDictionary
        
saveUserInfoToLocal(NSDic)
saveSettingInfoToLocal(NSDic)
        
let dic = userInfoFromLocal() as NSDictionary
dic.setValue("SWift->OC", forKey: "name1")
saveUserInfoToLocal(dic)