NSFileManager文件操作的十个小功能

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- (Nsstring *)getDocumentsPath
{
    //获取Documents路径
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
    Nsstring *path = [paths objectAtIndex:0];
    NSLog(@"path:%@",path);
    return path;
} 

创建文件夹

-(void)createDirectory{
    Nsstring *documentsPath =[self getDocumentsPath];
    NSFileManager *fileManager = [NSFileManager defaultManager];
    Nsstring *iOSDirectory = [documentsPath stringByAppendingPathComponent:@"iOS"];
    BOOL isSuccess = [fileManager createDirectoryAtPath:iOSDirectory withIntermediateDirectories:YES attributes:nil error:nil];
    if (isSuccess) {
        NSLog(@"success");
    } else {
        NSLog(@"fail");
    }
} 

创建文件

-(void)createFile{
    Nsstring *documentsPath =[self getDocumentsPath];
    NSFileManager *fileManager = [NSFileManager defaultManager];
    Nsstring *iOSPath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];
    BOOL isSuccess = [fileManager createFileAtPath:iOSPath contents:nil attributes:nil];
    if (isSuccess) {
        NSLog(@"success");
    } else {
        NSLog(@"fail");
    }
} 

写文件

-(void)writeFile{
    Nsstring *documentsPath =[self getDocumentsPath];
    Nsstring *iOSPath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];
    Nsstring *content = @"我要写数据啦";
    BOOL isSuccess = [content writetoFile:iOSPath atomically:YES encoding:NSUTF8StringEncoding error:nil];
    if (isSuccess) {
        NSLog(@"write success");
    } else {
        NSLog(@"write fail");
    }
} 

读取文件内容

-(void)readFileContent{
    Nsstring *documentsPath =[self getDocumentsPath];
    Nsstring *iOSPath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];
    Nsstring *content = [Nsstring stringWithContentsOfFile:iOSPath encoding:NSUTF8StringEncoding error:nil];
    NSLog(@"read success: %@",content);
} 

判断文件是否存在

- (BOOL)isSxistAtPath:(Nsstring *)filePath{
    NSFileManager *fileManager = [NSFileManager defaultManager];
    BOOL isExist = [fileManager fileExistsAtPath:filePath];
    return isExist;
} 

计算文件大小

- (unsigned long long)fileSizeAtPath:(Nsstring *)filePath{
    NSFileManager *fileManager = [NSFileManager defaultManager];
    BOOL isExist = [fileManager fileExistsAtPath:filePath];
    if (isExist){
        unsigned long long fileSize = [[fileManager attributesOfItemAtPath:filePath error:nil] fileSize];
        return fileSize;
    } else {
        NSLog(@"file is not exist");
        return 0;
    }
} 

计算整个文件夹中所有文件大小

- (unsigned long long)folderSizeAtPath:(Nsstring*)folderPath{
    NSFileManager *fileManager = [NSFileManager defaultManager];
    BOOL isExist = [fileManager fileExistsAtPath:folderPath];
    if (isExist){
        NSEnumerator *childFileEnumerator = [[fileManager subpathsAtPath:folderPath] objectEnumerator];
        unsigned long long folderSize = 0;
        Nsstring *fileName = @"";
        while ((fileName = [childFileEnumerator nextObject]) != nil){
            Nsstring* fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];
            folderSize += [self fileSizeAtPath:fileAbsolutePath];
        }
        return folderSize / (1024.0 * 1024.0);
    } else {
        NSLog(@"file is not exist");
        return 0;
    }
} 

删除文件

-(void)deleteFile{
    Nsstring *documentsPath =[self getDocumentsPath];
    NSFileManager *fileManager = [NSFileManager defaultManager];
    Nsstring *iOSPath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];
    BOOL isSuccess = [fileManager removeItemAtPath:iOSPath error:nil];
    if (isSuccess) {
        NSLog(@"delete success");
    }else{
        NSLog(@"delete fail");
    }
} 

移动文件

- (void)moveFileName
{
    Nsstring *documentsPath =[self getDocumentsPath];
    NSFileManager *fileManager = [NSFileManager defaultManager];
    Nsstring *filePath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];
    Nsstring *movetoPath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];
    BOOL isSuccess = [fileManager moveItemAtPath:filePath toPath:movetoPath error:nil];
    if (isSuccess) {
        NSLog(@"rename success");
    }else{
        NSLog(@"rename fail");
    }
} 

重命名

- (void)renameFileName
{
    //通过移动该文件对文件重命名
    Nsstring *documentsPath =[self getDocumentsPath];
    NSFileManager *fileManager = [NSFileManager defaultManager];
    Nsstring *filePath = [documentsPath stringByAppendingPathComponent:@"iOS.txt"];
    Nsstring *movetoPath = [documentsPath stringByAppendingPathComponent:@"rename.txt"];
    BOOL isSuccess = [fileManager moveItemAtPath:filePath toPath:movetoPath error:nil];
    if (isSuccess) {
        NSLog(@"rename success");
    }else{
        NSLog(@"rename fail");
    }
} 

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