表视图中的所有图像在iPhone应用程序中都是相同的

我有一个表格视图,在那里我希望每个单元格基于逻辑有一个不同的图像。这是我的cellforrowatindexpath代码:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *MyIdentifier = @"MyIdentifier";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle
                                       reuseIdentifier:MyIdentifier] autorelease];
    }


    NSInteger *row = [indexPath row];
    NSString *platform = [[myStringArray objectAtIndex: row];
    cell.imageView.image = [self imageForInventory:platform];

    return cell;
}

- (UIImage *)imageForInventory:(NSString *)platform {   
    if (platform = @"Win") {
        UIImage *winImage = [UIImage imageNamed:@"Vista.png"];

        return winImage;
    }else if (platform = @"Mac") {
        UIImage *appleImage = [UIImage imageNamed:@"Apple.png"];
        return appleImage;
    }else if (platform = @"Linux") {
        UIImage *linuxImage = [UIImage imageNamed:@"Linux.png"];
        return linuxImage;
    }   

    return nil;
}