Question

NSSearchPathDirectory

这些常量指定各种目录的位置。

enum {
   NSApplicationDirectory = 1,
   NSDemoApplicationDirectory,
   NSDeveloperApplicationDirectory,
   NSAdminApplicationDirectory,
   NSLibraryDirectory,
   NSDeveloperDirectory,
   NSUserDirectory,
   NSDocumentationDirectory,
   NSDocumentDirectory,
   NSCoreServiceDirectory,
   NSAutosavedInformationDirectory = 11,
   NSDesktopDirectory = 12,
   NSCachesDirectory = 13,
   NSApplicationSupportDirectory = 14,
   NSDownloadsDirectory = 15,
   NSInputMethodsDirectory = 16,
   NSMoviesDirectory = 17,
   NSMusicDirectory = 18,
   NSPicturesDirectory = 19,
   NSPrinterDescriptionDirectory = 20,
   NSSharedPublicDirectory = 21,
   NSPreferencePanesDirectory = 22,
   NSItemReplacementDirectory = 99,
   NSAllApplicationsDirectory = 100,
   NSAllLibrariesDirectory = 101
};
typedef NSUInteger NSSearchPathDirectory;

在这些路径目录中，我知道NSCachesDirectory和NSDocumentDirectory在iOS中可用。你知道其他人是否也是吗？

目前我正在NSCachesDirectory中下载图像，我使用[UIImage imageNamed：]在屏幕上打印图片。但我正在寻找一个更明确的文件夹来存储我的图像。

谢谢，

Answer 1

据我所知，这些只适用于iOS：

NSDocumentDirectory is Documents/     (persistent, backed up, may be visible in iTunes)
NSLibraryDirectory is Library/     (persistent, backed up, not visibe to the user)
NSCachesDirectory is Library/Caches/     (not backed up, may be cleared by system)

此外，还有：

NSTemporaryDirectory() is tmp/     (not backed up, *will* be cleared by system)

所有路径都与应用程序沙箱目录相关，您应该能够写入所有路径。所有这些目录都有不同的行为，适用于不同类型的文件。

为了存储图像，我会在库中创建目录，比方说Library/Thumbnails/。如果图像易于恢复或可下载，则应创建并使用Library/Caches/Thumbnails/。

可在iOS中使用的路径目录

1 个答案: