fix the segue problem. Doesn’t need to register it in topicList. If I register it , It doesn’t work in the storyboard, because it is not that cell anyMore.  http://stackoverflow.com/questions/23741278/prepareforsegue-not-getting-called-when-registering-a-custom-cell
can add more pictures now, present pics in a scrollView;
fix the push modelView bug. In storyboard, need to use instantiateViewControllerWithIdentifier. now it works fine;