什么是文件目錄（NSDocumentDirectory）？有人可以向我解釋iOS應(yīng)用程序上的文檔目錄以及何時使用它？以下是我目前的看法：對我來說，它似乎是一個中央文件夾，用戶可以存儲該應(yīng)用程序所需的任何文件。這與Core Data存儲數(shù)據(jù)的位置不同？似乎每個應(yīng)用程序都有自己的文檔目錄。我可以自由創(chuàng)建文件目錄的子目錄，如文件目錄/圖像，或文件目錄/視頻？
3 回答
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TA貢獻1775條經(jīng)驗 獲得超8個贊
您的應(yīng)用程序（在非越獄設(shè)備上）在“沙盒”環(huán)境中運行。這意味著它只能訪問自己內(nèi)容中的文件和目錄。例如文檔和庫。
要訪問應(yīng)用程序沙箱的Documents目錄，可以使用以下命令：
iOS 8及更新版本，這是推薦的方法
+ (NSURL *)applicationDocumentsDirectory{
return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];}如果您需要支持iOS 7或更早版本
+ (NSString *) applicationDocumentsDirectory
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *basePath = paths.firstObject;
return basePath;}此文檔目錄允許您存儲應(yīng)用程序創(chuàng)建或可能需要的文件和子目錄。
要訪問應(yīng)用程序沙箱的庫目錄中的文件，請使用（代替paths上述）：
[NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) objectAtIndex:0]
慕碼人2483693
TA貢獻1860條經(jīng)驗 獲得超9個贊
我無法在接受的答案建議的文檔中找到代碼，但我在此處找到了更新的等效內(nèi)容：
文件系統(tǒng)編程指南::訪問文件和目錄?
- (NSURL*)applicationDataDirectory {
NSFileManager* sharedFM = [NSFileManager defaultManager];
NSArray* possibleURLs = [sharedFM URLsForDirectory:NSApplicationSupportDirectory
inDomains:NSUserDomainMask];
NSURL* appSupportDir = nil;
NSURL* appDirectory = nil;
if ([possibleURLs count] >= 1) {
// Use the first directory (if multiple are returned)
appSupportDir = [possibleURLs objectAtIndex:0];
}
// If a valid app support directory exists, add the
// app's bundle ID to it to specify the final directory.
if (appSupportDir) {
NSString* appBundleID = [[NSBundle mainBundle] bundleIdentifier];
appDirectory = [appSupportDir URLByAppendingPathComponent:appBundleID];
}
return appDirectory;
}
它不鼓勵使用NSSearchPathForDirectoriesInDomain：
NSSearchPathForDirectoriesInDomains函數(shù)的行為類似于URLForDirectory：inDomains：方法，但將目錄的位置作為基于字符串的路徑返回。您應(yīng)該使用URLForDirectory：inDomains：方法。
以下是一些其他有用的目錄常量。毫無疑問，iOS中并不支持所有這些功能。您還可以使用NSHomeDirectory（）函數(shù)：
在iOS中，主目錄是應(yīng)用程序的沙箱目錄。在OS X中，它是應(yīng)用程序的沙箱目錄或當(dāng)前用戶的主目錄（如果應(yīng)用程序不在沙箱中）
來自NSPathUtilities.h
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 NS_ENUM_AVAILABLE(10_6, 4_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 NS_ENUM_AVAILABLE(10_5, 2_0) = 15, // location of the user's "Downloads" directory
NSInputMethodsDirectory NS_ENUM_AVAILABLE(10_6, 4_0) = 16, // input methods (Library/Input Methods)
NSMoviesDirectory NS_ENUM_AVAILABLE(10_6, 4_0) = 17, // location of user's Movies directory (~/Movies)
NSMusicDirectory NS_ENUM_AVAILABLE(10_6, 4_0) = 18, // location of user's Music directory (~/Music)
NSPicturesDirectory NS_ENUM_AVAILABLE(10_6, 4_0) = 19, // location of user's Pictures directory (~/Pictures)
NSPrinterDescriptionDirectory NS_ENUM_AVAILABLE(10_6, 4_0) = 20, // location of system's PPDs directory (Library/Printers/PPDs)
NSSharedPublicDirectory NS_ENUM_AVAILABLE(10_6, 4_0) = 21, // location of user's Public sharing directory (~/Public)
NSPreferencePanesDirectory NS_ENUM_AVAILABLE(10_6, 4_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 NS_ENUM_AVAILABLE(10_6, 4_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 NS_ENUM_AVAILABLE(10_8, NA) = 102 // location of Trash directory
最后，NSURL類別中的一些便捷方法 http://club15cc.com/code/ios/easy-ios-file-directory-paths-with-this-handy-nsurl-category
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