目录
床前明月光，疑是地上霜。 举头望明月，低头思故乡。
前言
1. 沙盒
当iOS系统安装应用时，会为该应用分配一块独立的空间（用来存放该应用的系统文件和缓存），该应用只能访问该空间中的资源，这种机制称之为沙盒机制。
有4个文件夹：
1、应用名.app
应用程序包：程序本身，包含资源。是经过加签的，运行时不能修改。
2、Documents
存储用户下载或保存的数据。会被iTunes备份。
3、Library
Caches文件夹：存储SDWebImg...等缓存。不会被iTunes备份。
Preferences文件夹：会被iTunes备份。存储系统偏好设置NSUserdefaults。
4、temp
存储临时文件。不会被iTunes备份，应用销毁后即清除。
NSHomeDirectory() 沙盒根目录
// 存储路径
NSString *path=[NSString stringWithFormat:@"%@/Documents/1.src",NSHomeDirectory()];
// 获取Documents目录路径
NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES) firstObject];
// 获取Library的目录路径
NSString *libDir = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory,NSUserDomainMask,YES) lastObject];
// 获取cache目录路径
NSString *cachesDir = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES) firstObject];
// 获取tmp目录路径
NSString *tmpDir =NSTemporaryDirectory();
/*
第一个参数：想要查找的目录
ypedef NS_ENUM(NSUInteger, NSSearchPathDirectory) {
NSApplicationDirectory = 1, // supported applications (Applications)
NSDemoApplicationDirectory, // unsupported applications, demonstration versions (Demos)
NSDeveloperApplicationDirectory, // developer applications (Developer/Applications). DEPRECATED - there is no one single Developer directory.
NSAdminApplicationDirectory, // system and network administration applications (Administration)
NSLibraryDirectory, // various documentation, support, and configuration files, resources (Library)
NSDeveloperDirectory, // developer resources (Developer) DEPRECATED - there is no one single Developer directory.
NSUserDirectory, // user home directories (Users)
NSDocumentationDirectory, // documentation (Documentation)
NSDocumentDirectory, // documents (Documents)
NSCoreServiceDirectory, // location of CoreServices directory (System/Library/CoreServices)
NSAutosavedInformationDirectory API_AVAILABLE(macos(10.6), ios(4.0), watchos(2.0), tvos(9.0)) = 11, // location of autosaved documents (Documents/Autosaved)
NSDesktopDirectory = 12, // location of user's desktop
NSCachesDirectory = 13, // location of discardable cache files (Library/Caches)
NSApplicationSupportDirectory = 14, // location of application support files (plug-ins, etc) (Library/Application Support)
NSDownloadsDirectory API_AVAILABLE(macos(10.5), ios(2.0), watchos(2.0), tvos(9.0)) = 15, // location of the user's "Downloads" directory
NSInputMethodsDirectory API_AVAILABLE(macos(10.6), ios(4.0), watchos(2.0), tvos(9.0)) = 16, // input methods (Library/Input Methods)
NSMoviesDirectory API_AVAILABLE(macos(10.6), ios(4.0), watchos(2.0), tvos(9.0)) = 17, // location of user's Movies directory (~/Movies)
NSMusicDirectory API_AVAILABLE(macos(10.6), ios(4.0), watchos(2.0), tvos(9.0)) = 18, // location of user's Music directory (~/Music)
NSPicturesDirectory API_AVAILABLE(macos(10.6), ios(4.0), watchos(2.0), tvos(9.0)) = 19, // location of user's Pictures directory (~/Pictures)
NSPrinterDescriptionDirectory API_AVAILABLE(macos(10.6), ios(4.0), watchos(2.0), tvos(9.0)) = 20, // location of system's PPDs directory (Library/Printers/PPDs)
NSSharedPublicDirectory API_AVAILABLE(macos(10.6), ios(4.0), watchos(2.0), tvos(9.0)) = 21, // location of user's Public sharing directory (~/Public)
NSPreferencePanesDirectory API_AVAILABLE(macos(10.6), ios(4.0), watchos(2.0), tvos(9.0)) = 22, // location of the PreferencePanes directory for use with System Preferences (Library/PreferencePanes)
NSApplicationScriptsDirectory NS_ENUM_AVAILABLE(10_8, NA) = 23, // location of the user scripts folder for the calling application (~/Library/Application Scripts/code-signing-id)
NSItemReplacementDirectory API_AVAILABLE(macos(10.6), ios(4.0), watchos(2.0), tvos(9.0)) = 99, // For use with NSFileManager's URLForDirectory:inDomain:appropriateForURL:create:error:
NSAllApplicationsDirectory = 100, // all directories where applications can occur
NSAllLibrariesDirectory = 101, // all directories where resources can occur
NSTrashDirectory API_AVAILABLE(macos(10.8), ios(11.0)) API_UNAVAILABLE(watchos, tvos) = 102 // location of Trash directory
};
第二个参数：从哪个路径区域查找
typedef NS_OPTIONS(NSUInteger, NSSearchPathDomainMask) {
NSUserDomainMask =1, // 用户的主目录
NSLocalDomainMask =2, // 当前机器的本地目录
NSNetworkDomainMask =4, //在网络中公开可用的位置
NSSystemDomainMask =8, // 被苹果系统提供的，不可更改的位置 (/System)
NSAllDomainsMask = 0x0ffff // 上述所有及未来的位置
};
第三个参数：true时显示具体路径，false时使用～代替主目录路径。
*/
// [NSBundle mainBundle] 返回的路径是 .../项目名.app/
NSString *imagePath = [[NSBundle mainBundle] pathForResource:@"apple"ofType:@"png"];
UIImage *appleImage = [[UIImage alloc] initWithContentsOfFile:imagePath];
2. 下载手机应用的沙盒目录
当项目遇到保存录音内容等需求时，会需要查看应用沙盒目录。
步骤
1. XCode的Window下点击Devices and Simulators
2. 单击installapp中的指定应用，点击设置按钮，点击DownloadContainer
3. 找到下载的.xcappdata文件，右键查看包内容
XCode的Window下点击Devices and Simulators
单击installapp中的指定应用，点击设置按钮，点击DownloadContainer
找到下载的xcap文件，右键查看包内容
Documents
Library