uipageViewcontroller显示错误的页面

Question

我正在使用uipageviewcontroller，它显示错误的索引页面。我发现uipageviewcontroller中存在缓存问题。这个bug仍然存在于ios8上。我找到了客观的东西 - c。有人可以帮助将此代码转换为swift吗？顺便说一下，我不想使用pageCurl风格！

__weak YourSelfClass *blocksafeSelf = self; 
[self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:YES completion:^(BOOL finished){
        if(finished)
        {
            dispatch_async(dispatch_get_main_queue(), ^{
                [blocksafeSelf.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:NULL];// bug fix for uipageview controller
            });
        }
    }];