1）首先我們獲取使用者文件目錄路徑

        let manager = FileManager.default

        let urlForDocument = manager.urls(for: .documentDirectory, in:.userDomainMask)

        let url = urlForDocument[0] as URL

        print(url)

//        （2）對指定路徑執行淺搜尋，返回指定目錄路徑下的檔案、子目錄及符號連結的列表

        let contentsOfPath = try? manager.contentsOfDirectory

        print("contentsOfPath: \(contentsOfPath)")

//        （3）類似上面的，對指定路徑執行淺搜尋，返回指定目錄路徑下的檔案、子目錄及符號連結的列表

        let contentsOfURL = try? manager.contentsOfDirectory(at: url,

                                                             includingPropertiesForKeys: nil, options: .skipsHiddenFiles

        print("contentsOfURL: \(contentsOfURL)")

//        （4）深度遍歷，會遞迴遍歷子資料夾（但不會遞迴符號連結）

        let enumeratorAtPath = manager.enumerator(atPath: url.path)

        print("enumeratorAtPath: \(enumeratorAtPath?.allObjects)")

//        （5）類似上面的，深度遍歷，會遞迴遍歷子資料夾（但不會遞迴符號連結）

        let enumeratorAtURL = manager.enumerator

                                                 options: .skipsHiddenFiles, errorHandler:nil)

        print("enumeratorAtURL: \(enumeratorAtURL?.allObjects)")

//        （6）深度遍歷，會遞迴遍歷子資料夾（包括符號連結，所以要求效能的話用enumeratorAtPath）

        let subPaths = manager.subpaths(atPath: url.path)

        print("subPaths: \(subPaths)")

//        2，判斷檔案或資料夾是否存在

        let fileManager = FileManager.default

        let filePath:String = NSHomeDirectory() + "/Documents/hangge.txt"

        let exist = fileManager.fileExists(atPath: filePath)

//        3，建立資料夾

//        方式1：

        let myDirectory:String = NSHomeDirectory() + "/Documents/myFolder/Files"

        let fileManager = FileManager.default

//withIntermediateDirectories為ture表示路徑中間如果有不存在的資料夾都會建立

        try! fileManager.createDirectory(atPath: myDirectory,

                                         withIntermediateDirectories: true, attributes: nil)

//        方式2：

        func createFolder(name:String,baseUrl:NSURL){

            let manager = FileManager.default

            let folder = baseUrl.appendingPathComponent(name, isDirectory: true)

            print("資料夾: \(folder)")

            let exist = manager.fileExists(atPath: folder!.path)

            if !exist {

                try! manager.createDirectory(at: folder!, withIntermediateDirectories: true,

                                             attributes: nil)

            }

        }

//在文件目錄下新建folder目錄

        let manager = FileManager.default

        let urlForDocument = manager.urls(for: .documentDirectory, in: .userDomainMask)

        let url = urlForDocument[0] as NSURL

        createFolder(name: "folder", baseUrl: url)

//        4，將物件寫入檔案

//        可以通過write(to:)方法，可以建立檔案並將物件寫入，物件包括String，NSString，UIImage，NSArray，NSDictionary等。

//        （1）把String儲存到檔案

//

        let filePath:String = NSHomeDirectory() + "/Documents/hangge.txt"

        let info = "歡迎來到hange.com"

        try! info.write(toFile: filePath, atomically: true, encoding: String.Encoding.utf8)

//        （2）把圖片儲存到檔案路徑下

        let filePath = NSHomeDirectory() + "/Documents/hangge.png"

        let image = UIImage(named: "apple.png")

        let data:Data = UIImagePNGRepresentation(image!)!

        try? data.write(to: URL(fileURLWithPath: filePath))

//        （3）把NSArray儲存到檔案路徑下

        let array = NSArray(objects: "aaa","bbb","ccc")

        let filePath:String = NSHomeDirectory() + "/Documents/array.plist"

        array.write(toFile: filePath, atomically: true)

//        （4）把NSDictionary儲存到檔案路徑下

let dictionary:NSDictionary = ["Gold": "1st Place", "Silver": "2nd Place"]

letfilePath:String = NSHomeDirectory() + "/Documents/dictionary.plist"

        dictionary.write(toFile: filePath, atomically: true)

//        5，建立檔案

        func createFile(name:String, fileBaseUrl:URL){

            let manager = FileManager.default

            let file = fileBaseUrl.appendingPathComponent(name)

            print("檔案: \(file)")

            let exist = manager.fileExists(atPath: file.path)

            if !exist {

                let data = Data(base64Encoded:"aGVsbG8gd29ybGQ=" ,options:.ignoreUnknownCharacters)

                let createSuccess = manager.createFile(atPath: file.path,contents:data,attributes:nil)

                print("檔案建立結果: \(createSuccess)")

            }

        }

//在文件目錄下新建test.txt檔案

        let manager = FileManager.default

        let urlForDocument = manager.urls( for: .documentDirectory,

                                           in:.userDomainMask)

        let url = urlForDocument[0]

        createFile(name:"test.txt", fileBaseUrl: url)

//createFile(name: "folder/new.txt", fileBaseUrl: url)

//        6，複製檔案

//        （1）方法1

        let fileManager = FileManager.default

        let homeDirectory = NSHomeDirectory()

        let srcUrl = homeDirectory + "/Documents/hangge.txt"

        let toUrl = homeDirectory + "/Documents/copyed.txt"

        try! fileManager.copyItem(atPath: srcUrl, toPath: toUrl)

//        （2）方法2

// 定位到使用者文件目錄

        let manager = FileManager.default

        let urlForDocument = manager.urls( for:.documentDirectory, in:.userDomainMask)

        let url = urlForDocument[0]

// 將test.txt檔案拷貝到文件目錄根目錄下的copyed.txt檔案

        let srcUrl = url.appendingPathComponent("test.txt")

        let toUrl = url.appendingPathComponent("copyed.txt")

        try! manager.copyItem(at: srcUrl, to: toUrl)

//        7，移動檔案

//        （1）方法1

        let fileManager = FileManager.default

        let homeDirectory = NSHomeDirectory()

        let srcUrl = homeDirectory + "/Documents/hangge.txt"

        let toUrl = homeDirectory + "/Documents/moved/hangge.txt"

        try! fileManager.moveItem(atPath: srcUrl, toPath: toUrl)

//        （2）方法2

// 定位到使用者文件目錄

        let manager = FileManager.default

        let urlForDocument = manager.urls( for: .documentDirectory, in:.userDomainMask)

        let url = urlForDocument[0]

        let srcUrl = url.appendingPathComponent("test.txt")

        let toUrl = url.appendingPathComponent("copyed.txt")

// 移動srcUrl中的檔案（test.txt）到toUrl中（copyed.txt）

        try! manager.moveItem(at: srcUrl, to: toUrl)

// 8，刪除檔案

        （1）方法1

        let fileManager = FileManager.default

        let homeDirectory = NSHomeDirectory()

        let srcUrl = homeDirectory + "/Documents/hangge.txt"

        try! fileManager.removeItem(atPath: srcUrl)

// （2）方法2

// 定位到使用者文件目錄

        let manager = FileManager.default

        let urlForDocument = manager.urls(for: .documentDirectory, in:.userDomainMask)

        let url = urlForDocument[0]

        let toUrl = url.appendingPathComponent("copyed.txt")

// 刪除文件根目錄下的toUrl路徑的檔案（copyed.txt檔案）

        try! manager.removeItem(at: toUrl)

// 9，刪除目錄下所有的檔案

//（1）方法1：獲取所有檔案，然後遍歷刪除

        let fileManager = FileManager.default

        let myDirectory = NSHomeDirectory() + "/Documents/Files"

        let fileArray = fileManager.subpaths(atPath: myDirectory)

        for fn in fileArray!{

            try! fileManager.removeItem(atPath: myDirectory + "/\(fn)")

        }

//（2）方法2：刪除目錄後重新建立該目錄

        let fileManager = FileManager.default

        let myDirectory = NSHomeDirectory() + "/Documents/Files"

        try! fileManager.removeItem(atPath: myDirectory)

        try! fileManager.createDirectory(atPath: myDirectory, withIntermediateDirectories: true,

                                         attributes: nil)

//  10，讀取檔案

        let manager = FileManager.default

        let urlsForDocDirectory = manager.urls(for: .documentDirectory, in:.userDomainMask)

        let docPath = urlsForDocDirectory[0]

        let file = docPath.appendingPathComponent("test.txt")

        //方法1

        let readHandler = try! FileHandle(forReadingFrom:file)

        let data = readHandler.readDataToEndOfFile()

        let readString = String(data: data, encoding: String.Encoding.utf8)

        print("檔案內容: \(readString)")

        //方法2

        let data2 = manager.contents(atPath: file.path)

        let readString2 = String(data: data2!, encoding: String.Encoding.utf8)

        print("檔案內容: \(readString2)")

//  11，在任意位置寫入資料

        let manager = FileManager.default

        let urlsForDocDirectory = manager.urls(for:.documentDirectory, in:.userDomainMask)

        let docPath = urlsForDocDirectory[0]

        let file = docPath.appendingPathComponent("test.txt")

        let string = "新增一些文字到檔案末尾"

        let appendedData = string.data(using: String.Encoding.utf8, allowLossyConversion: true)

        let writeHandler = try? FileHandle(forWritingTo:file)

        writeHandler!.seekToEndOfFile()

        writeHandler!.write(appendedData!)

// 12，檔案許可權判斷

        let manager = FileManager.default

        let urlForDocument = manager.urls(for: .documentDirectory, in:.userDomainMask)

        let docPath = urlForDocument[0]

        let file = docPath.appendingPathComponent("test.txt")

        let readable = manager.isReadableFile(atPath: file.path)

        print("可讀: \(readable)")

        let writeable = manager.isWritableFile(atPath: file.path)

        print("可寫: \(writeable)")

        let executable = manager.isExecutableFile(atPath: file.path)

        print("可執行: \(executable)")

        let deleteable = manager.isDeletableFile(atPath: file.path)

        print("可刪除: \(deleteable)")

//13，獲取檔案屬性（建立時間，修改時間，檔案大小，檔案型別等資訊）

        let manager = FileManager.default

        let urlForDocument = manager.urls(for: .documentDirectory, in:.userDomainMask)

        let docPath = urlForDocument[0]

        let file = docPath.appendingPathComponent("test.txt")

        let attributes = try? manager.attributesOfItem(atPath: file.path) //結果為Dictionary型別

        print("attributes: \(attributes!)")

//從 attributes 中獲取具體的屬性：

print("建立時間：\(attributes![FileAttributeKey.creationDate]!)")

print("修改時間：\(attributes![FileAttributeKey.modificationDate]!)")

        print("檔案大小：\(attributes![FileAttributeKey.size]!)")

// 14，檔案/資料夾比較

        let manager = FileManager.default

        let urlForDocument = manager.urls(for: .documentDirectory, in:.userDomainMask)

        let docPath = urlForDocument[0]

        let contents = try! manager.contentsOfDirectory(atPath: docPath.path)

//下面比較使用者文件中前面兩個檔案是否內容相同（該方法也可以用來比較目錄）

        let count = contents.count

        if count > 1 {

            let path1 = docPath.path + "/" + (contents[0] as String)

            let path2 = docPath.path + "/" + (contents[1] as String)

            let equal = manager.contentsEqual(atPath: path1,andPath:path2)

            print("path1：\(path1)")

            print("path2：\(path2)")

            print("比較結果： \(equal)")

        }