我不是代码的制造者，我是代码的搬运工。

//
//  HanFileManager.h
//

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface HanFileManager : NSObject
///获取Document路径
+(NSString *)getDocumentPath;
///获取Caches路径
+(NSString *)getCachesPath;
///获取Library路径
+(NSString *)getLibraryPath;
///创建文件夹
+(BOOL)creatDir:(NSString *)path;
///创建文件
+(BOOL)creatFile:(NSString*)filePath;
///写数据
+(BOOL)writeToFile:(NSString*)filePath contents:(NSData *)data;
///追加写数据
+(BOOL)appendData:(NSData*)data withPath:(NSString *)filePath;
///读文件数据
+(NSData*)readFileData:(NSString *)path;
///获取文件夹下所有的文件列表
+(NSArray*)getFileList:(NSString*)path;
///获取文件夹下所有文件(深度遍历)
+(NSArray*)getAllFileList:(NSString*)path;
///复制文件
+(BOOL)copyFile:(NSString *)fromPath toPath:(NSString *)toPath;
///移动文件
+(BOOL)moveFile:(NSString *)fromPath toPath:(NSString *)toPath toPathIsDir:(BOOL)dir;
///删除文件
+(BOOL)moveItemAtPath:(NSString*)fromPath toPath:(NSString*)toPath;
///删除文件夹
+(BOOL)removeDir:(NSString*)path;
///删除某些后缀的文件
+(void)removeFileSuffixList:(NSArray<NSString*>*)suffixList filePath:(NSString*)path deep:(BOOL)deep;
///获取文件大小
+(long long)getFileSize:(NSString*)path;
@end

NS_ASSUME_NONNULL_END

//
//  HanFileManager.m
//

#import "HanFileManager.h"

@implementation HanFileManager
///获取Document路径
+(NSString *)getDocumentPath{
    NSArray *filePaths =NSSearchPathForDirectoriesInDomains (NSDocumentDirectory,  NSUserDomainMask, YES);
    NSString *path = filePaths.firstObject;
    return path;
}
///获取Caches路径
+(NSString *)getCachesPath{
    NSArray *filePaths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
    NSString *path = filePaths.firstObject;
    return path;
}
///获取Library路径
+(NSString *)getLibraryPath{
    NSArray *filePaths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
    NSString *path = filePaths.firstObject;
    return path;
}
///创建文件夹
+(BOOL)creatDir:(NSString *)path{
    if (path.length==0) {
        return NO;
    }
    NSFileManager *fileManager = [NSFileManager defaultManager];
    BOOL isSuccess = YES;
    BOOL isExist = [fileManager fileExistsAtPath:path];
    if (isExist==NO) {
        NSError *error;
        if (![fileManager createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:&error]) {
            isSuccess = NO;
            NSLog(@"creat Directory Failed:%@",[error localizedDescription]);
        }
    }
    return isSuccess;
}
///创建文件
+(BOOL)creatFile:(NSString*)filePath{
    if (filePath.length==0) {
        return NO;
    }
    NSFileManager *fileManager = [NSFileManager defaultManager];
    if ([fileManager fileExistsAtPath:filePath]) {
        return YES;
    }
    NSError *error;
    NSString *dirPath = [filePath stringByDeletingLastPathComponent];
    BOOL isSuccess = [fileManager createDirectoryAtPath:dirPath withIntermediateDirectories:YES attributes:nil error:&error];
    if (error) {
        NSLog(@"creat File Failed:%@",[error localizedDescription]);
    }
    if (!isSuccess) {
        return isSuccess;
    }
    isSuccess = [fileManager createFileAtPath:filePath contents:nil attributes:nil];
    return isSuccess;
}
///写数据
+(BOOL)writeToFile:(NSString*)filePath contents:(NSData *)data{
    if (filePath.length==0) {
        return NO;
    }
    BOOL result = [self creatFile:filePath];
    if (result) {
        if ([data writeToFile:filePath atomically:YES]) {
            NSLog(@"write Success");
        }else{
            NSLog(@"write Failed");
        }
    }
    else{
        NSLog(@"write Failed");
    }
    return result;
}
///追加写数据
+(BOOL)appendData:(NSData*)data withPath:(NSString *)filePath{
    if (filePath.length==0) {
        return NO;
    }
    BOOL result = [self creatFile:filePath];
    if (result) {
        NSFileHandle *handle = [NSFileHandle fileHandleForWritingAtPath:filePath];
        [handle seekToEndOfFile];
        [handle writeData:data];
        [handle synchronizeFile];
        [handle closeFile];
    }
    else{
        NSLog(@"appendData Failed");
    }
    return result;
}
///读文件数据
+(NSData*)readFileData:(NSString *)path{
    NSFileHandle *handle = [NSFileHandle fileHandleForReadingAtPath:path];
    NSData *fileData = [handle readDataToEndOfFile];
    [handle closeFile];
    return fileData;
}
///获取文件夹下所有的文件列表
+(NSArray*)getFileList:(NSString*)path{
    if (path.length==0) {
        return nil;
    }
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    NSArray *fileList = [fileManager contentsOfDirectoryAtPath:path error:&error];
    if (error) {
        NSLog(@"getFileList Failed:%@",[error localizedDescription]);
    }
    return fileList;
}
///获取文件夹下所有文件(深度遍历)
+(NSArray*)getAllFileList:(NSString*)path{
    if (path.length==0) {
        return nil;
    }
    NSArray *fileArray = [self getFileList:path];
    NSMutableArray *fileArrayNew = [NSMutableArray array];
    NSFileManager *fileManager = [NSFileManager defaultManager];
    for (NSString *aPath in fileArray) {
        NSString * fullPath = [path stringByAppendingPathComponent:aPath];
        BOOL isDir = NO;
        if ([fileManager fileExistsAtPath:fullPath isDirectory:&isDir]) {
            if (isDir) {
                [fileArrayNew addObjectsFromArray:[self getAllFileList:fullPath]];
            }else{
                [fileArrayNew addObject:fullPath];
            }
        }
    }
    return fileArrayNew;
}
///复制文件
+(BOOL)copyFile:(NSString *)fromPath toPath:(NSString *)toPath{
    NSFileManager *fileManager = [NSFileManager defaultManager];
    if (![fileManager fileExistsAtPath:fromPath]) {
        NSLog(@"Error: fromPath Not Exist");
        return NO;
    }
    NSError *error;
    BOOL isSuc = [fileManager copyItemAtPath:fromPath toPath:toPath error:&error];
    if (error) {
        NSLog(@"copyFile Field：%@",[error localizedDescription]);
    }else{
        NSLog(@"copyFile Success");
    }
    return isSuc;
}
///移动文件
+(BOOL)moveFile:(NSString *)fromPath toPath:(NSString *)toPath toPathIsDir:(BOOL)dir{
    NSFileManager *fileManager = [NSFileManager defaultManager];
    if (![fileManager fileExistsAtPath:fromPath]) {
        NSLog(@"Error: fromPath Not Exist");
        return NO;
    }
    BOOL isDir = NO;
    BOOL isExist = [fileManager fileExistsAtPath:toPath isDirectory:&isDir];
    if (isExist) {
        if (isDir) {
            if ([self creatDir:toPath]) {
                NSString *fileName = fromPath.lastPathComponent;
                toPath = [toPath stringByAppendingPathComponent:fileName];
                return [self moveItemAtPath:fromPath toPath:toPath];
            }
        }else{
            [self removeFile:toPath];
            return [self moveItemAtPath:fromPath toPath:toPath];
        }
    }
    else{
        if (dir) {
            if ([self creatDir:toPath]) {
                NSString *fileName = fromPath.lastPathComponent;
                toPath = [toPath stringByAppendingPathComponent:fileName];
                return [self moveItemAtPath:fromPath toPath:toPath];
            }
        }else{
            return [self moveItemAtPath:fromPath toPath:toPath];
        }
    }
    return NO;
}
///删除文件
+(BOOL)moveItemAtPath:(NSString*)fromPath toPath:(NSString*)toPath{
    BOOL result = NO;
    NSError * error = nil;
    NSFileManager *fileManager = [NSFileManager defaultManager];
    result = [fileManager moveItemAtPath:fromPath toPath:toPath error:&error];
    if (error){
        NSLog(@"moveFile Fileid：%@",[error localizedDescription]);
    }
    return result;
}
///删除文件夹
+(BOOL)removeFile:(NSString*)filePath{
    BOOL isSuccess = NO;
    NSError *error;
    NSFileManager *fileManager = [NSFileManager defaultManager];
    isSuccess = [fileManager removeItemAtPath:filePath error:&error];
    if (error) {
        NSLog(@"removeFile Field：%@",[error localizedDescription]);
    }else{
        NSLog(@"removeFile Success");
    }
    return isSuccess;
}
///删除文件夹
+(BOOL)removeDir:(NSString*)path{
    return [self removeFile:path];
}
///删除某些后缀的文件
+(void)removeFileSuffixList:(NSArray<NSString*>*)suffixList filePath:(NSString*)path deep:(BOOL)deep{
    NSArray *fileArray = nil;
    if (deep) {  // 是否深度遍历
        fileArray = [self getAllFileList:path];
    }else{
        fileArray = [self getFileList:path];
        NSMutableArray *fileArrayTmp = [NSMutableArray array];
        for (NSString *fileName in fileArray) {
            NSString* allPath = [path stringByAppendingPathComponent:fileName];
            [fileArrayTmp addObject:allPath];
        }
        fileArray = fileArrayTmp;
    }
    for (NSString *aPath in fileArray) {
        for (NSString* suffix in suffixList) {
            if ([aPath hasSuffix:suffix]) {
                [self removeFile:aPath];
            }
        }
    }
}
///获取文件大小
+(long long)getFileSize:(NSString*)path{
    unsigned long long fileLength = 0;
    NSNumber *fileSize;
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSDictionary *fileAttributes = [fileManager attributesOfItemAtPath:path error:nil];
    if ((fileSize = [fileAttributes objectForKey:NSFileSize])) {
        fileLength = [fileSize unsignedLongLongValue]; //单位是 B
    }
    return fileLength;
}
///获取文件的信息(包含了上面文件大小)
+(NSDictionary*)getFileInfo:(NSString*)path{
    NSError *error;
    NSDictionary *reslut =  [[NSFileManager defaultManager] attributesOfItemAtPath:path error:&error];
    if (error) {
        NSLog(@"getFileInfo Failed:%@",[error localizedDescription]);
    }
    return reslut;
}

@end

原文地址：iOS 关于文件操作 NSFileManager