//******************** 5.2 文件操作
     func use_FileOperations()
     {
         //1、获取程序的Home目录
         let homeDirectory = NSHomeDirectory()
         println(homeDirectory)

         //2、获取Documents目录
         let documentPaths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)

 //        let documentPath = documentPaths[0] as String

          //2015年5月2号修改
         let documentPath = documentPaths[] as! String
          println(documentPath)

         //或通过home目录自己追加文件夹
         var documentPath2 = homeDirectory + "/Documents"
         println(documentPath2)

         //3、获取Library目录
         let libraryPaths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.LibraryDirectory, NSSearchPathDomainMask.UserDomainMask, true)
 //        let libraryPath = libraryPaths[0] as String

         //2015年5月2号修改
         let libraryPath = libraryPaths[] as! String

         println(libraryPath)

         //或通过home目录自己追加文件夹
         var libraryPath2 = homeDirectory + "/Library"
         println(libraryPath2)

         //4、获取Cache目录
         let cachesPaths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.CachesDirectory, NSSearchPathDomainMask.UserDomainMask, true)
 //        let cachesPath = cachesPaths[0] as String

         //2015年5月2号修改
         let cachesPath = cachesPaths[] as! String
         println(cachesPath)

         //或通过home目录自己追加文件夹
         var cachesPath2 = homeDirectory + "/Library/Caches"
         println(cachesPath2)

         //5、获取Tmp目录
         let tmpDir = NSTemporaryDirectory()
         println(tmpDir)

         //或通过home目录自己追加文件夹
         var tmpDir2 = homeDirectory + "/tmp"
         println(tmpDir2)

         //对于错误信息
         var error:NSError?

         // 创建文件管理器
         var fileManager :NSFileManager = NSFileManager.defaultManager()

         //创建目录
         //定义几个自己的目录
         let myDirectory1:String = NSHomeDirectory() + "/Documents/myFolder/Images"
         let myDirectory2:String = NSHomeDirectory() + "/Documents/myFolder/Films"
         let myDirectory3:String = NSHomeDirectory() + "/Documents/myFolder/Musics"
         let myDirectory4:String = NSHomeDirectory() + "/Documents/myFolder/Files"

         //创建目录
         //withIntermediateDirectories 设置成true，代表中间所有的路径目录如果不存在，都会创建
         //如果设置成false，因为myFolder目录不存在，所以无法创建1234目录
         var isSuccess:Bool = fileManager.createDirectoryAtPath(myDirectory1, withIntermediateDirectories: true, attributes: nil, error: &error)
         println(error) //isSuccess=true代表创建成功，如果创建失败，error 会返回错误信息

         fileManager.createDirectoryAtPath(myDirectory2, withIntermediateDirectories: true, attributes: nil, error: &error)

         fileManager.createDirectoryAtPath(myDirectory3, withIntermediateDirectories: true, attributes: nil, error: &error)

         fileManager.createDirectoryAtPath(myDirectory4, withIntermediateDirectories: true, attributes: nil, error: &error)

         //创建文件
         var filePath = myDirectory1 + "/appInfo.txt"
         var info = "经常听到：被中介骗了，押金不退，晚一天交房租，被讹了。租房普遍现象：网上报价不真实？经常被忽悠！（看房时报价都比网上高！）证件不齐全，被骗过!（其实根本不是房东啦!）看房前态度都很热情！ 签约之后态度骤变!入住后家电维修只能靠自己！ 房屋到期，押金各种被勒索！现在开始，你来改变这一切！《租房点评》为你而备，租房无忧！再也不用担心被欺骗，想要知道给你介绍房子的人好不好，《租房点评》告诉你！"
         info.writeToFile(filePath, atomically: true, encoding: NSUTF8StringEncoding, error: &error)

         //保存图片
         var image = UIImage(named: "SwiftClassWeiXin@3x.png")
         var data:NSData = UIImageJPEGRepresentation(image, 1.0)
         var data1:NSData = UIImagePNGRepresentation(image)
         data.writeToFile(myDirectory1 + "/SwiftClassIcon.jpg", atomically: true)
         data1.writeToFile(myDirectory1 + "/SwiftClassIcon.png", atomically: true)

         //保存NSArray
         var array = NSArray(objects: ")
         array.writeToFile(myDirectory4 + "/array.plist", atomically: true)

         //保存NSDic
         var dictionary = NSDictionary(objects: ["])
         dictionary.writeToFile(myDirectory4 + "/dictionary.plist", atomically: true)

         //判断目录或文件是否存在
         var exist = fileManager.fileExistsAtPath(filePath)
         println(exist)

         //移动
         var filePath2 = myDirectory4 + "/appInfo.txt"
         fileManager.moveItemAtPath(filePath, toPath: filePath2, error: &error)

         //重命名
         //通过移动该文件对文件重命名
         var filePath3 = myDirectory4 + "/appInfo2.txt"
         fileManager.moveItemAtPath(filePath2, toPath: filePath3, error: &error)

         //拷贝
         var filePath4 = myDirectory4 + "/appInfoCopy.txt"
         fileManager.copyItemAtPath(filePath3, toPath: filePath4, error: &error)

         //获取目录列里所有文件名
         //先赋值一些文件到myDirectory4目录下
         var filePath00 = myDirectory4 + "/appInfoCopy00.txt"
         var filePath11 = myDirectory4 + "/appInfoCopy11.txt"
         var filePath22 = myDirectory4 + "/appInfoCopy22.txt"
         fileManager.copyItemAtPath(filePath3, toPath: filePath00, error: &error)
         fileManager.copyItemAtPath(filePath3, toPath: filePath11, error: &error)
         fileManager.copyItemAtPath(filePath3, toPath: filePath22, error: &error)

         //获取所有文件
         var fileArray = fileManager.subpathsAtPath(myDirectory4)
         println(fileArray)
 //        Optional([appInfo.txt, appInfo2.txt, appInfoCopy.txt, appInfoCopy00.txt, appInfoCopy11.txt, appInfoCopy22.txt])

         //IPhone中获取文件各项属性方法
         //获取文件属性
         var fileAttributes : [NSObject:AnyObject]? = NSFileManager.defaultManager().attributesOfItemAtPath(filePath22, error: &error)

         //获取文件的创建日期
         var modificationDate:AnyObject? = fileAttributes![NSFileModificationDate]
         println(modificationDate)

         //获取文件的字节大小
         var fileSize:AnyObject? = fileAttributes![NSFileSize]
         println(fileSize)

         //删除文件
         fileManager.removeItemAtPath(filePath4, error: &error)

         //删除目录下所有文件
         //方法1： 获取所有文件，然后遍历删除
         var fileArray2 : [AnyObject]? = fileManager.subpathsAtPath(myDirectory4)
         for fn in fileArray2!
         {
             fileManager.removeItemAtPath(myDirectory4 + "/\(fn)", error: &error)
         }

         //方法2：删除目录后重新创建该目录
         fileManager.removeItemAtPath(myDirectory4, error: &error)
         fileManager.createDirectoryAtPath(myDirectory4, withIntermediateDirectories: true, attributes: nil, error: &error)

     }