IOS_swift文件系统

func files(){
//应用根目录
let dir = NSHomeDirectory();
NSLog("dir = \(dir)")

// 文档目录
let doc = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]
NSLog("doc = \(doc)")

// library目录
let library = NSSearchPathForDirectoriesInDomains(.LibraryDirectory, .UserDomainMask, true)[0]
NSLog("doc = \(library)")

//判断目录是否存在
let manager = NSFileManager.defaultManager()
let myDir = "\(doc)/my"
let isExist = manager.fileExistsAtPath(myDir)
if(isExist){
NSLog("存在my文件夹")
}else{
NSLog("不存在my文件夹！")
//创建文件夹
do{
try manager.createDirectoryAtPath(myDir, withIntermediateDirectories: true, attributes: nil)
}catch{
}
}

//判断文件是否存在
let myTxt = "\(doc)/my.txt"
let isExistMyTxt = manager.fileExistsAtPath(myTxt)
if(isExistMyTxt){
NSLog("存在my.txt")
}else{
NSLog("不存在my.txt")
//创建文件
manager.createFileAtPath(myTxt, contents: nil, attributes: nil)
}

// 用户首选项
let userDefault = NSUserDefaults.standardUserDefaults()
userDefault.setObject("2012", forKey: "time")
userDefault.synchronize()

let time = userDefault.stringForKey("time")
NSLog("time = \(time!)")

//保存文件
let arr:NSArray = ["11","33","22"]
arr.writeToFile(myTxt, atomically: true)

let content = NSArray(contentsOfFile: myTxt)!
print(content)

//对象保存
let stuPlist = "\(doc)/stu.plist"
let stu = Student(name: "zhangsan", age: 20)
NSKeyedArchiver.archiveRootObject(stu, toFile: stuPlist)

let stu2 = NSKeyedUnarchiver.unarchiveObjectWithFile(stuPlist) as? Student
if stu2 != nil {
print("name = \(stu2!.name), age = \(stu2!.age)")
}
}