iOS应用目录
[self filelist:NSHomeDirectory()];
来看一下打印结果：
真机：
>>>:/var/mobile/Applications/A3209D39-4D02-40C2-99B4-4111A218CF1F
>>>:/var/mobile/Applications/A3209D39-4D02-40C2-99B4-4111A218CF1F/Directory.app
>>>:/var/mobile/Applications/A3209D39-4D02-40C2-99B4-4111A218CF1F/Directory.app/Directory
>>>:/var/mobile/Applications/A3209D39-4D02-40C2-99B4-4111A218CF1F/Directory.app/Info.plist
>>>:/var/mobile/Applications/A3209D39-4D02-40C2-99B4-4111A218CF1F/Directory.app/PkgInfo
>>>:/var/mobile/Applications/A3209D39-4D02-40C2-99B4-4111A218CF1F/Directory.app/ResourceRules.plist
>>>:/var/mobile/Applications/A3209D39-4D02-40C2-99B4-4111A218CF1F/Directory.app/_CodeSignature
>>>:/var/mobile/Applications/A3209D39-4D02-40C2-99B4-4111A218CF1F/Directory.app/_CodeSignature/CodeResources
>>>:/var/mobile/Applications/A3209D39-4D02-40C2-99B4-4111A218CF1F/Directory.app/embedded.mobileprovision
>>>:/var/mobile/Applications/A3209D39-4D02-40C2-99B4-4111A218CF1F/Directory.app/en.lproj
>>>:/var/mobile/Applications/A3209D39-4D02-40C2-99B4-4111A218CF1F/Directory.app/en.lproj/InfoPlist.strings
>>>:/var/mobile/Applications/A3209D39-4D02-40C2-99B4-4111A218CF1F/Directory.app/en.lproj/ViewController_iPad.nib
>>>:/var/mobile/Applications/A3209D39-4D02-40C2-99B4-4111A218CF1F/Directory.app/en.lproj/ViewController_iPhone.nib
>>>:/var/mobile/Applications/A3209D39-4D02-40C2-99B4-4111A218CF1F/Documents
>>>:/var/mobile/Applications/A3209D39-4D02-40C2-99B4-4111A218CF1F/Library
>>>:/var/mobile/Applications/A3209D39-4D02-40C2-99B4-4111A218CF1F/Library/Caches
>>>:/var/mobile/Applications/A3209D39-4D02-40C2-99B4-4111A218CF1F/Library/Preferences
>>>:/var/mobile/Applications/A3209D39-4D02-40C2-99B4-4111A218CF1F/Library/Preferences/.GlobalPreferences.plist
>>>:/var/mobile/Applications/A3209D39-4D02-40C2-99B4-4111A218CF1F/Library/Preferences/com.apple.PeoplePicker.plist
>>>:/var/mobile/Applications/A3209D39-4D02-40C2-99B4-4111A218CF1F/tmp
模拟器：
>>>:/Users/liuwei/Library/Application Support/iPhone Simulator/5.1/Applications/595FAC37-23AA-434A-84BE-3274C7A8A6F1
>>>:/Users/liuwei/Library/Application Support/iPhone Simulator/5.1/Applications/595FAC37-23AA-434A-84BE-3274C7A8A6F1/Directory.app
>>>:/Users/liuwei/Library/Application Support/iPhone Simulator/5.1/Applications/595FAC37-23AA-434A-84BE-3274C7A8A6F1/Directory.app/Directory
>>>:/Users/liuwei/Library/Application Support/iPhone Simulator/5.1/Applications/595FAC37-23AA-434A-84BE-3274C7A8A6F1/Directory.app/en.lproj
>>>:/Users/liuwei/Library/Application Support/iPhone Simulator/5.1/Applications/595FAC37-23AA-434A-84BE-3274C7A8A6F1/Directory.app/en.lproj/InfoPlist.strings
>>>:/Users/liuwei/Library/Application Support/iPhone Simulator/5.1/Applications/595FAC37-23AA-434A-84BE-3274C7A8A6F1/Directory.app/en.lproj/ViewController_iPad.nib
>>>:/Users/liuwei/Library/Application Support/iPhone Simulator/5.1/Applications/595FAC37-23AA-434A-84BE-3274C7A8A6F1/Directory.app/en.lproj/ViewController_iPhone.nib
>>>:/Users/liuwei/Library/Application Support/iPhone Simulator/5.1/Applications/595FAC37-23AA-434A-84BE-3274C7A8A6F1/Directory.app/Info.plist
>>>:/Users/liuwei/Library/Application Support/iPhone Simulator/5.1/Applications/595FAC37-23AA-434A-84BE-3274C7A8A6F1/Directory.app/PkgInfo
>>>:/Users/liuwei/Library/Application Support/iPhone Simulator/5.1/Applications/595FAC37-23AA-434A-84BE-3274C7A8A6F1/Documents
>>>:/Users/liuwei/Library/Application Support/iPhone Simulator/5.1/Applications/595FAC37-23AA-434A-84BE-3274C7A8A6F1/Library
>>>:/Users/liuwei/Library/Application Support/iPhone Simulator/5.1/Applications/595FAC37-23AA-434A-84BE-3274C7A8A6F1/Library/Caches
>>>:/Users/liuwei/Library/Application Support/iPhone Simulator/5.1/Applications/595FAC37-23AA-434A-84BE-3274C7A8A6F1/Library/Preferences
>>>:/Users/liuwei/Library/Application Support/iPhone Simulator/5.1/Applications/595FAC37-23AA-434A-84BE-3274C7A8A6F1/Library/Preferences/.GlobalPreferences.plist
>>>:/Users/liuwei/Library/Application Support/iPhone Simulator/5.1/Applications/595FAC37-23AA-434A-84BE-3274C7A8A6F1/Library/Preferences/com.apple.PeoplePicker.plist
>>>:/Users/liuwei/Library/Application Support/iPhone Simulator/5.1/Applications/595FAC37-23AA-434A-84BE-3274C7A8A6F1/tmp
分析：
虽然真机和模拟器有点不一样，但是其实是大同小异。NSHomeDirectory() 是获取沙盒的根目录，然后就是他下面的其他目录：Directory.app(Directory是我这个工程的名字)、Documents、Library、tmp，Library下面又有一些子目录等等。
Directory.app 是程序包目录，主要包含和程序相关的文件，Documents你可以自己放一些文件到这个目录下，Library 也是个重要的目录，比如你的NSUserDefaults的数据就是在Libarary下面的Preferences中，还有 Caches 等等，tmp看名字就知道是一个存放临时文件的。我们主要用到的还是documentd和library。
不多说了，要想明白，自己把我的代码copy过去试一下就知道了。
