文件路径 - NSPathUtilities

文件路径搜索

// 1. 常用的文件夹名称 2.搜索主目录位置 3.是否获取完整的目录
    NSArray *arr = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

// 获取位置路径
    NSString *path = arr[0];

常量

FOUNDATION_EXPORT NSString *NSUserName(void); - 用户名
FOUNDATION_EXPORT NSString *NSFullUserName(void); - 用户全名
注：真机上跟自己的 名称不一样，不知道具体指啥？

FOUNDATION_EXPORT NSString *NSHomeDirectory(void); - 用户主目录，沙盒主目录,使用这个拼接也方便
FOUNDATION_EXPORT NSString *NSTemporaryDirectory(void); - 用户的临时目录
其他沙盒目录需要方法获取。

FOUNDATION_EXPORT NSString * __nullable NSHomeDirectoryForUser(NSString * __nullable userName);
FOUNDATION_EXPORT NSString *NSOpenStepRootDirectory(void);

搜索位置

typedef NS_OPTIONS(NSUInteger, NSSearchPathDomainMask) {
    NSUserDomainMask = 1,       // 用户目录 - 基本上就用这个。 
    NSLocalDomainMask = 2,      // 本地
    NSNetworkDomainMask = 4,    // 网络 
    NSSystemDomainMask = 8,     // 系统
    NSAllDomainsMask = 0x0ffff  // 所有 
};

常用文件夹名称

typedef NS_ENUM(NSUInteger, NSSearchPathDirectory) {

- 系统路径下 - NSSystemDomainMask
    NSApplicationDirectory = 1,             // 应用程序
    NSDemoApplicationDirectory,             // 应用程序 demo？
    NSAdminApplicationDirectory,            // 实用工具文件夹
    NSLibraryDirectory,                     // 系统资源库 (Library) - 不是 隐藏的资源库
    NSUserDirectory,                        // 用户 (Users)


    NSDeveloperApplicationDirectory,        // 已弃用
    NSDeveloperDirectory,                   // 已弃用


- 用户路径 - NSUserDomainMask
    NSDocumentationDirectory,               // Library 下的(Documentation)模拟器上没有创建
    NSDocumentDirectory,                    // Documents


- 其他 坑爹的
    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

};

文件类型搜索

// 通过 NSFileManager 的获取文件后续的，筛选工作。
    NSArray *fileList = [[[NSFileManager defaultManager] contentsOfDirectoryAtPath:homeDirectory error:nil] pathsMatchingExtensions:[NSArray arrayWithObject:@"png"]] ;    

其他方法 与 属性

数组 拼接成 路径 - 以及反向

    NSString *path = [NSString pathWithComponents:@[@"1",@"2",@"3"]];
    NSArray *com = [path pathComponents];

路径末位 操作

@property (readonly, copy) NSString *lastPathComponent;
@property (readonly, copy) NSString *stringByDeletingLastPathComponent;
- (NSString *)stringByAppendingPathComponent:(NSString *)str;

路径后缀（文件类型 .png 等）操作

@property (readonly, copy) NSString *pathExtension;
@property (readonly, copy) NSString *stringByDeletingPathExtension;
- (nullable NSString *)stringByAppendingPathExtension:(NSString *)str;

其他

// 当前string 变成~，OSX上用，app不需要。跟沙箱有关。 @property (readonly, copy) NSString *stringByAbbreviatingWithTildeInPath; 
 
 // 格式化 路径？？
 @property (readonly, copy) NSString *stringByExpandingTildeInPath;
 @property (readonly, copy) NSString *stringByStandardizingPath;
 @property (readonly, copy) NSString *stringByResolvingSymlinksInPath;
 
 // 拼接 路径
 - (NSArray *)stringsByAppendingPaths:(NSArray *)paths;

未知

获取路径下一层 的某些类型的数量，路径，路径数组。（文件夹算1，不管什么类型）
- (NSUInteger)completePathIntoString:(NSString * __nonnull * __nullable)outputName caseSensitive:(BOOL)flag matchesIntoArray:(NSArray * __nonnull * __nullable)outputArray filterTypes:(nullable NSArray *)filterTypes;

NSString *sss;
NSArray *aaa;
NSArray *ttt = @[@"plist",@"text"];

NSUInteger com2 = [path completePathIntoString:&sss caseSensitive:NO matchesIntoArray:&aaa filterTypes:ttt];

@property (readonly) __strong const char *fileSystemRepresentation NS_RETURNS_INNER_POINTER;
- (BOOL)getFileSystemRepresentation:(char *)cname maxLength:(NSUInteger)max;