如何从远程服务器下载照片到iPhone应用程序？

My situation is that I am making a uitableviewcontroller with uitableviewcells having a thumb nail or picture on the left, text on the right. All data is stored in a remote server. I have made a php to communicate with backend batabase and generate JSON to pass the data to iphone through http. However, I don't know how to do the same thing to photos. Please suggest me someway to do it. Thanks! My situation is that I am making a uitableviewc