IOS SWIFT 簡單操作文件

//Home目錄
let homeDirectory = NSHomeDirectory()
//Documents目錄 蘋果建議將程序中建立的或在程序中瀏覽到的文件數據保存在該目錄下，iTunes備份和恢復的時候會包含此目錄
let documentPaths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)
let documentPath = documentPaths[0] as! String
//let documentPath = homeDirectory + "/Documents"
        
//Library目錄  這個目錄下有2個子目錄：Caches緩存 , Preferences偏好設置,不應該直接創建偏好設置文件而使用NSUserDefaults類
let libraryPaths =  NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.LibraryDirectory, NSSearchPathDomainMask.UserDomainMask, true)
let libraryPath = libraryPaths[0] as! String
//let libraryPath = homeDirectory + "/Library"
        
//Cache目錄 主要存放緩存文件，iTunes不會備份此目錄，此目錄下文件不會在應用退出時刪除
let cachesPaths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.CachesDirectory, NSSearchPathDomainMask.UserDomainMask, true)
let cachesPath = cachesPaths[0] as! String
//let cachesPath = homeDirectory + "/Library/Caches"
        
//tmp目錄  用於存放臨時文件，保持應用程序再次啟動過程中不需要的信息，重啟后清空
let tmpDir = NSTemporaryDirectory()
//let tmpDir = homeDirectory + "/tmp"
        
//操作文件
var fileManager = NSFileManager.defaultManager()
var error : NSError?
        
let mydir1 = NSHomeDirectory() + "/Documents/myfolder/images"
let mydir2 = NSHomeDirectory() + "/Documents/myfolder/films"
let mydir3 = NSHomeDirectory() + "/Documents/myfolder/musics"
let mydir4 = NSHomeDirectory() + "/Documents/myfolder/files"
        
//withIntermediateDirectories 設置為true， 代表中間所有的路徑目錄如果不存在，都會創建
var isSuccess : Bool = fileManager.createDirectoryAtPath(mydir1, withIntermediateDirectories: true, attributes: nil, error: &error)
        
fileManager.createDirectoryAtPath(mydir2, withIntermediateDirectories: true, attributes: nil, error: &error)
fileManager.createDirectoryAtPath(mydir3, withIntermediateDirectories: true, attributes: nil, error: &error)
fileManager.createDirectoryAtPath(mydir4, withIntermediateDirectories: true, attributes: nil, error: &error)
        
//創建文件可以通過writeToFile方法將一些對象寫入到文件中
var filePath = mydir4 + "/appInfo.txt"
var info  = "this is test text"
info.writeToFile(filePath, atomically: true, encoding: NSUTF8StringEncoding, error: &error)
        
//保存圖片
var image = UIImage(named: "2.jpg")
var data : NSData = UIImageJPEGRepresentation(image, 1.0)
var data1 : NSData = UIImagePNGRepresentation(image)
data.writeToFile(mydir1 + "/2.jpg", atomically: true)
data1.writeToFile(mydir1 + "/2.png", atomically: true)
        
//保存NSAarry
var array = NSArray(objects: "111","222","333")
array.writeToFile(mydir4 + "/array.plist", atomically: true)
        
//保存NSDictionary
var dic = NSDictionary(objects: ["1111","2222","3333"], forKeys: ["1","2","3"])
dic.writeToFile(mydir4 + "/dictionary.plist", atomically: true)
        
//判斷目錄是否存在
var isExist = fileManager.fileExistsAtPath(filePath)
        
//移動文件
var filePath2 = mydir1 + "/appInfo.txt"
fileManager.moveItemAtPath(filePath, toPath: filePath2, error: &error)
        
//移動，重命名
var filePath3 = mydir1 + "/appInfo2.txt"
fileManager.moveItemAtPath(filePath2, toPath: filePath3, error: &error)
        
//拷貝，重命名
var filePath4 = mydir1 + "/appInfoCopy.txt"
fileManager.copyItemAtPath(filePath3, toPath: filePath4, error: &error)
        
//獲取目錄下所有文件
var fileArray = fileManager.subpathsAtPath(mydir1)
//println(fileArray)
        
//獲取文件各項屬性
var fileAttributes : [NSObject : AnyObject]? = NSFileManager.defaultManager().attributesOfItemAtPath(filePath2, error: &error)
var modificationDate = fileAttributes![NSFileModificationDate] as! String
println(modificationDate)  //2015-09-03 12:04:39 +0000
        
//刪除文件
fileManager.removeItemAtPath(filePath4, error: &error)
        
//刪除目錄下所有文件
//方法1
var fileArray2 : [AnyObject]? = fileManager.subpathsAtPath(mydir1)
for f in fileArray2! {
　　fileManager.removeItemAtPath(mydir1 + "/\(f)", error: &error)
}
//方法2
fileManager.removeItemAtPath(mydir1, error: &error)
fileManager.createDirectoryAtPath(mydir1, withIntermediateDirectories: true, attributes: nil, error: &error)