NSFileManager 文件应用

- (void)clearDisk
{
    dispatch_async(self.ioQueue, ^
    {
        [[NSFileManager defaultManager] removeItemAtPath:self.diskCachePath error:nil];
        [[NSFileManager defaultManager] createDirectoryAtPath:self.diskCachePath
                                  withIntermediateDirectories:YES
                                                   attributes:nil
                                                        error:NULL];
    });
}

- (void)cleanDisk
{
    dispatch_async(self.ioQueue, ^
    {
        NSDate *expirationDate = [NSDate dateWithTimeIntervalSinceNow:-self.maxCacheAge];
        NSDirectoryEnumerator *fileEnumerator = [[NSFileManager defaultManager] enumeratorAtPath:self.diskCachePath];
        for (NSString *fileName in fileEnumerator)
        {
            NSString *filePath = [self.diskCachePath stringByAppendingPathComponent:fileName];
            NSDictionary *attrs = [[NSFileManager defaultManager] attributesOfItemAtPath:filePath error:nil];
            if ([[[attrs fileModificationDate] laterDate:expirationDate] isEqualToDate:expirationDate])
            {
                [[NSFileManager defaultManager] removeItemAtPath:filePath error:nil];
            }
        }
    });
}

-(int)getSize
{
    int size = 0;
    NSDirectoryEnumerator *fileEnumerator = [[NSFileManager defaultManager] enumeratorAtPath:self.diskCachePath];
    for (NSString *fileName in fileEnumerator)
    {
        NSString *filePath = [self.diskCachePath stringByAppendingPathComponent:fileName];
        NSDictionary *attrs = [[NSFileManager defaultManager] attributesOfItemAtPath:filePath error:nil];
        size += [attrs fileSize];
    }
    return size;
}

- (int)getDiskCount
{
    int count = 0;
    NSDirectoryEnumerator *fileEnumerator = [[NSFileManager defaultManager] enumeratorAtPath:self.diskCachePath];
    for (NSString *fileName in fileEnumerator)
    {
        count += 1;
    }
    
    return count;
}