title: How to make the customized UITableViewCell xib width to fit the device width
body: <p>I am creating a <code>UITableTableViewCell</code> from a nib file. I am using width of 320 for the the cell width. I found when I run the app in <code>iphone 6</code> simulator, the cell cannot occupy the whole width of the table view.  If I use iphone 5s, the width is just fine. I want to know how to adjust the width of the xib to fit to different iPhone versions. </p>