/* 创建默认文件管理器
*/
@property (class, readonly, strong) NSFileManager *defaultManager;
/* 返回一个在计算机可用卷上的NSURL数组
*/
- (nullable NSArray<NSURL *> *)mountedVolumeURLsIncludingResourceValuesForKeys:(nullable NSArray<NSURLResourceKey> *)propertyKeys options:(NSVolumeEnumerationOptions)options;
/* 卸载指定的url路径
*/
- (void)unmountVolumeAtURL:(NSURL *)url options:(NSFileManagerUnmountOptions)mask completionHandler:(void (^)(NSError * _Nullable errorOrNil))completionHandler;
/* 枚举一个url路径下的文件，返回一个url数组
*/
- (nullable NSArray<NSURL *> *)contentsOfDirectoryAtURL:(NSURL *)url includingPropertiesForKeys:(nullable NSArray<NSURLResourceKey> *)keys options:(NSDirectoryEnumerationOptions)mask error:(NSError **)error;
/*返回一个路径下的NSURL数组
*/
- (NSArray<NSURL *> *)URLsForDirectory:(NSSearchPathDirectory)directory inDomains:(NSSearchPathDomainMask)domainMask;
- (nullable NSURL *)URLForDirectory:(NSSearchPathDirectory)directory inDomain:(NSSearchPathDomainMask)domain appropriateForURL:(nullable NSURL *)url create:(BOOL)shouldCreate error:(NSError **)error;
// 两个文件的关系
- (BOOL)getRelationship:(NSURLRelationship *)outRelationship ofDirectoryAtURL:(NSURL *)directoryURL toItemAtURL:(NSURL *)otherURL error:(NSError **)error;
// 文件和指定系统路径之间的关系
- (BOOL)getRelationship:(NSURLRelationship *)outRelationship ofDirectory:(NSSearchPathDirectory)directory inDomain:(NSSearchPathDomainMask)domainMask toItemAtURL:(NSURL *)url error:(NSError **)error;
//创建目录 withIntermediatetDirectories:YES 创建额外需要的文件夹，创建父目录不存在的子目录，自动将父目录创建
- (BOOL)createDirectoryAtURL:(NSURL *)url withIntermediateDirectories:(BOOL)createIntermediates attributes:(nullable NSDictionary<NSFileAttributeKey, id> *)attributes error:(NSError **)error;
//在指定的网址创建一个指定的指向某个项目的符号链接。
- (BOOL)createSymbolicLinkAtURL:(NSURL *)url withDestinationURL:(NSURL *)destURL error:(NSError **)error;
//设置指定的文件或目录的属性
- (BOOL)setAttributes:(NSDictionary<NSFileAttributeKey, id> *)attributes ofItemAtPath:(NSString *)path error:(NSError **)error;
//创建文件夹
@param path 要创建文件夹的路径
@param createIntermediates 是否创建中间文件夹 经过实验发现 如 @"/Users/plyn/Desktop/实验4/shiyan" 路径中/实验4/shiyan本来是不存在的 如果这个参数是YES则可以成功地创建这个路径地文件夹；如果传NO则无法创建
@param attribute 创建文件夹属性 传nil地话系统会自动创建
@param error 错误信息
- (BOOL)createDirectoryAtPath:(NSString *)path withIntermediateDirectories:(BOOL)createIntermediates attributes:(nullable NSDictionary<NSFileAttributeKey, id> *)attributes error:(NSError **)error;
//获取文件夹里面的文件名 非递归
- (nullable NSArray<NSString *> *)contentsOfDirectoryAtPath:(NSString *)path error:(NSError **)error;
//获取文件夹里面的文件名 递归的，及返回子文件夹的子文件名
- (nullable NSArray<NSString *> *)subpathsOfDirectoryAtPath:(NSString *)path error:(NSError **)error;
//给定路径中的项目的属性
- (nullable NSDictionary<NSFileAttributeKey, id> *)attributesOfItemAtPath:(NSString *)path error:(NSError **)error;
//获取文件夹的属性
- (nullable NSDictionary<NSFileAttributeKey, id> *)attributesOfFileSystemForPath:(NSString *)path error:(NSError **)error;
可通过以下方法获取相关属性
@interface NSDictionary (NSFileAttributes)
- (unsigned long long)fileSize; //文件大小
- (NSDate *)fileModificationDate; //文件的修改时间
- (NSString *)fileType; //文件类型
- (NSUInteger)filePosixPermissions;
- (NSString *)fileOwnerAccountName; //文件拥有者
- (NSString *)fileGroupOwnerAccountName;
- (NSInteger)fileSystemNumber;
- (NSUInteger)fileSystemFileNumber;
- (BOOL)fileExtensionHidden;
- (OSType)fileHFSCreatorCode;
- (OSType)fileHFSTypeCode;
- (BOOL)fileIsImmutable;
- (BOOL)fileIsAppendOnly;
- (NSDate *)fileCreationDate; //创建时间
- (NSNumber *)fileOwnerAccountID;
- (NSNumber *)fileGroupOwnerAccountID;
@end
//创建指向指定目的地的符号链接。
- (BOOL)createSymbolicLinkAtPath:(NSString *)path withDestinationPath:(NSString *)destPath error:(NSError **)error;
//在指定的路径上创建项目之间的硬连接
- (nullable NSString *)destinationOfSymbolicLinkAtPath:(NSString *)path error:(NSError **)error;
//拷贝文件
- (BOOL)copyItemAtPath:(NSString *)srcPath toPath:(NSString *)dstPath error:(NSError **)error;
//移动
- (BOOL)moveItemAtPath:(NSString *)srcPath toPath:(NSString *)dstPath error:(NSError **)error;
//在指定的文件之间创建一个硬链接
- (BOOL)linkItemAtPath:(NSString *)srcPath toPath:(NSString *)dstPath error:(NSError **)error;
//删除
- (BOOL)removeItemAtPath:(NSString *)path error:(NSError **)error;
//拷贝文件
- (BOOL)copyItemAtURL:(NSURL *)srcURL toURL:(NSURL *)dstURL error:(NSError **)error;
//移动
- (BOOL)moveItemAtURL:(NSURL *)srcURL toURL:(NSURL *)dstURL error:(NSError **)error;
//在指定的网址的项目之间创建一个硬链接
- (BOOL)linkItemAtURL:(NSURL *)srcURL toURL:(NSURL *)dstURL error:(NSError **)error;
//删除
- (BOOL)removeItemAtURL:(NSURL *)URL error:(NSError **)error;
- (BOOL)trashItemAtURL:(NSURL *)url resultingItemURL:(NSURL * _Nullable * _Nullable)outResultingURL error:(NSError **)error;
//获取文件属性
- (nullable NSDictionary *)fileAttributesAtPath:(NSString *)path traverseLink:(BOOL)yorn ;
- (BOOL)changeFileAttributes:(NSDictionary *)attributes atPath:(NSString *)path;
- (nullable NSArray *)directoryContentsAtPath:(NSString *)path;
- (nullable NSDictionary *)fileSystemAttributesAtPath:(NSString *)path;
- (nullable NSString *)pathContentOfSymbolicLinkAtPath:(NSString *)path;
- (BOOL)createSymbolicLinkAtPath:(NSString *)path pathContent:(NSString *)otherpath;
- (BOOL)createDirectoryAtPath:(NSString *)path attributes:(NSDictionary *)attributes;
- (BOOL)linkPath:(NSString *)src toPath:(NSString *)dest handler:(nullable id)handler;
- (BOOL)copyPath:(NSString *)src toPath:(NSString *)dest handler:(nullable id)handler;
- (BOOL)movePath:(NSString *)src toPath:(NSString *)dest handler:(nullable id)handler;
- (BOOL)removeFileAtPath:(NSString *)path handler:(nullable id)handler;
// 改变当前工作目录到指定的文件夹
- (BOOL)changeCurrentDirectoryPath:(NSString *)path;
//指定路径是否存在
- (BOOL)fileExistsAtPath:(NSString *)path;
- (BOOL)fileExistsAtPath:(NSString *)path isDirectory:(nullable BOOL *)isDirectory;
//指定文件是否可读
- (BOOL)isReadableFileAtPath:(NSString *)path;
//指定文件是否可写
- (BOOL)isWritableFileAtPath:(NSString *)path;
//指定文件是否可执行
- (BOOL)isExecutableFileAtPath:(NSString *)path;
//指定文件是否可删除
- (BOOL)isDeletableFileAtPath:(NSString *)path;
// 比较两个路径所指向的文件内容是否一样
- (BOOL)contentsEqualAtPath:(NSString *)path1 andPath:(NSString *)path2;
//提取文件名或者文件夹名
- (NSString *)displayNameAtPath:(NSString *)path;
//获取path地址 每一层的名称 以数组保存
- (nullable NSArray<NSString *> *)componentsToDisplayForPath:(NSString *)path;
//列出文件夹内容时
- (nullable NSDirectoryEnumerator<NSString *> *)enumeratorAtPath:(NSString *)path;
- (nullable NSDirectoryEnumerator<NSURL *> *)enumeratorAtURL:(NSURL *)url includingPropertiesForKeys:(nullable NSArray<NSURLResourceKey> *)keys options:(NSDirectoryEnumerationOptions)mask errorHandler:(nullable BOOL (^)(NSURL *url, NSError *error))handler ;
//获得该路径下的所有文件和文件夹路径
- (nullable NSArray<NSString *> *)subpathsAtPath:(NSString *)path;
//获取路径文件内容
- (nullable NSData *)contentsAtPath:(NSString *)path;
//创建文件
- (BOOL)createFileAtPath:(NSString *)path contents:(nullable NSData *)data attributes:(nullable NSDictionary<NSFileAttributeKey, id> *)attr;
// 路径转char
- (const char *)fileSystemRepresentationWithPath:(NSString *)path NS_RETURNS_INNER_POINTER;
// 从char中获取指定长度的路径
- (NSString *)stringWithFileSystemRepresentation:(const char *)str length:(NSUInteger)len;
//用一个文件替换另一个文件
- (BOOL)replaceItemAtURL:(NSURL *)originalItemURL withItemAtURL:(NSURL *)newItemURL backupItemName:(nullable NSString *)backupItemName options:(NSFileManagerItemReplacementOptions)options resultingItemURL:(NSURL * _Nullable * _Nullable)resultingURL error:(NSError **)error;
// 移动文件到云中
/// - parameter flag : true移动到云中,false从云中删除
/// - parameter itemAtURL : 本地路径
/// - parameter destinationURL : 云路径
- (BOOL)setUbiquitous:(BOOL)flag itemAtURL:(NSURL *)url destinationURL:(NSURL *)destinationURL error:(NSError **)error;
//是否该项目是针对存储在iCloud
- (BOOL)isUbiquitousItemAtURL:(NSURL *)url;
// 从云中下载文件
- (BOOL)startDownloadingUbiquitousItemAtURL:(NSURL *)url error:(NSError **)error;
// 删除云对应的本地副本
- (BOOL)evictUbiquitousItemAtURL:(NSURL *)url error:(NSError **)error;
/// 生成云的url，可在浏览器中下载
- (nullable NSURL *)URLForUbiquityContainerIdentifier:(nullable NSString *)containerIdentifier;
/// 生成云的url，可在浏览器中下载并且设置截止日期
- (nullable NSURL *)URLForPublishingUbiquitousItemAtURL:(NSURL *)url expirationDate:(NSDate * _Nullable * _Nullable)outDate error:(NSError **)error;
- (void)getFileProviderServicesForItemAtURL:(NSURL *)url completionHandler:(void (^)(NSDictionary <NSFileProviderServiceName, NSFileProviderService *> * _Nullable services, NSError * _Nullable error))completionHandler;
//访问共享数据区
- (nullable NSURL *)containerURLForSecurityApplicationGroupIdentifier:(NSString *)groupIdentifier
- (nullable NSURL *)homeDirectoryForUser:(NSString *)userName;
参考文：空中海
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