iOS计算文件大小的几种常用方法示例

#pragma mark 获取目录大小

 

// 方法1：循环调用fileSizeAtPath1

+ (long long)folderSizeAtPath1:(NSString *)folderPath

{

    NSFileManager *manager = [NSFileManager defaultManager];

    if (![manager fileExistsAtPath:folderPath])

        return 0;

    NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath:folderPath] objectEnumerator];

    NSString *fileName = nil;

    long long folderSize = 0;

    while ((fileName = [childFilesEnumerator nextObject]) != nil){

        NSString *fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];

        // Test 

//        if ([self fileSizeAtPath1:fileAbsolutePath] != [self fileSizeAtPath2:fileAbsolutePath]) {

//            NSLog(@"fileAbsolutePath = %@, %lld, %lld", fileAbsolutePath,

//                                                        [self fileSizeAtPath1:fileAbsolutePath],

//                                                        [self fileSizeAtPath2:fileAbsolutePath]);

//        }

        folderSize += [self fileSizeAtPath1:fileAbsolutePath];

    }

    return folderSize;

}

 

// 方法2：循环调用fileSizeAtPath2

+ (long long)folderSizeAtPath2:(NSString *)folderPath

{

    NSFileManager *manager = [NSFileManager defaultManager];

    if (![manager fileExistsAtPath:folderPath])

        return 0;

    NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath:folderPath] objectEnumerator];

    NSString *fileName = nil;

    long long folderSize = 0;

    while ((fileName = [childFilesEnumerator nextObject]) != nil) {

        NSString *fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];

        folderSize += [self fileSizeAtPath2:fileAbsolutePath];

    }

    return folderSize;

}

 

// 方法3：完全使用unix c函数

+ (long long)folderSizeAtPath3: (NSString *)folderPath

{

    return [self _folderSizeAtPath:[folderPath cStringUsingEncoding:NSUTF8StringEncoding]];

}

 

+ (long long)_folderSizeAtPath: (const char *)folderPath

{

    long long folderSize = 0;

    DIR *dir = opendir(folderPath);

    if (dir == NULL)

        return 0;

    

    struct dirent *child;

    while ((child = readdir(dir)) != NULL) {

        if (child->d_type == DT_DIR && (

                                        (child->d_name[0] == '.' && child->d_name[1] == 0) || // 忽略目录 .

                                        (child->d_name[0] == '.' && child->d_name[1] == '.' && child->d_name[2] == 0) // 忽略目录 ..

                                        )) continue;

        

        int folderPathLength = strlen(folderPath);

        char childPath[1024]; // 子文件的路径地址

        stpcpy(childPath, folderPath);

        if (folderPath[folderPathLength-1] != '/'){

            childPath[folderPathLength] = '/';

            folderPathLength++;

        }

        stpcpy(childPath+folderPathLength, child->d_name);

        childPath[folderPathLength + child->d_namlen] = 0;

        

        if (child->d_type == DT_DIR){ // directory

            folderSize += [self _folderSizeAtPath:childPath]; // 递归调用子目录

            // 把目录本身所占的空间也加上

            struct stat st;

            if(lstat(childPath, &st) == 0)

                folderSize += st.st_size;

        }else if (child->d_type == DT_REG || child->d_type == DT_LNK){ // file or link

            struct stat st;

            if(lstat(childPath, &st) == 0)

                folderSize += st.st_size;

        }

    }

    return folderSize;

}