ios文件操作之目录操作-NSFileManager

//
// ViewController.swift
// NSFileManager_Test
//
// Created by power on 16/6/1.
// Copyright © 2016年 power. All rights reserved.
//

import UIKit

class ViewController: UIViewController
{
//延迟加载，每次调用时，返回NSSearchPathForDirectoriesInDomains数组的第一个值，也就是目录位置
lazy var documentsPath:String = {
let paths =NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask,true)
return paths.first!
}()

overridefunc viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
directoryTest() //目录测试函数
fileTest() //文件测试函数
}

func directoryTest()
{
let path ="\(documentsPath)/Data"
print(path)

if !directoryExistsAtPath(path)
{
createDirectoryAtPath(path)

}
// deleteDirectoryAtPath(path)
// directoryExistsAtPath(path)
}

//判断目录是否存在，返回布尔值
func directoryExistsAtPath(path:String) ->Bool {
let fileManager =NSFileManager.defaultManager()
let result = fileManager.fileExistsAtPath(path)

//系统判断目录或者文件是否存在，都用的是fileExistsAtPath()方法

if result
{
print("dirctory exists...")
}
else
{
print("dirctory not exists...")
}
return result
}

//创建目录，参数为穿件目录
func createDirectoryAtPath(path:String)
{
let fileManager =NSFileManager.defaultManager()
do
{
try fileManager.createDirectoryAtPath(path, withIntermediateDirectories:false, attributes: nil)
}catch //如果创建失败，则打印一行报告
{
print("create directory failed")
}
}

//删除目录方法，参数为传入路径
func deleteDirectoryAtPath(path:String)
{
let fileManager =NSFileManager.defaultManager()
do
{
try fileManager.removeItemAtPath(path)
}
catch
{
print("delete directory failed")
}
}

func fileTest()
{
let path ="\(documentsPath)/data.txt"
print(path)

if !fileExistsAtPath(path)
{
createFileAtPath(path)
fileExistsAtPath(path)
}
}

func fileExistsAtPath(path:String) ->Bool
{
let fileManager =NSFileManager.defaultManager()
let result = fileManager.fileExistsAtPath(path)

if result
{
print("file exists")
}
else
{
print("file net exists")
}
return result
}

func createFileAtPath(path:String)
{
let fileManager =NSFileManager.defaultManager()
fileManager.createFileAtPath(path, contents:nil, attributes: nil)
}

func deleteFileAtPath(path:String)
{
let fileManager =NSFileManager.defaultManager()
do
{
try fileManager.removeItemAtPath(path)
}
catch
{
print("delete File failed")
}
}

overridefunc didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}

}