
iOS7 and iOS6 UITableView's style(UITableViewStyleGrouped) is different;iOS7 I set cell.layer.borderWidth, middle row too thick.I want iOS7 and iOS6 UITableView's style(UITableViewStyleGrouped)is same.How can I do?

iOS7 and iOS6 UITableView's style(UITableViewStyleGrouped) is different;iOS7 I set cell.layer.borderWidth, middle row too thick.I want iOS7 and iOS6 UITableView's style(UITableViewStyleGrouped)is same.How can I do?
By definition, iOS7 and iOS6 don't have the same design...
If you want the same design for both, you need to create a design which doesn't rely on the "iOS Design" itself.
If you just need to change the separator height, go here : How to increase the UITableView seperator height?
Look & Feel are different in iOS 7 so, the user wants a different layout. If you set the same layout for iOS 6 and iOS 7 does not make sense because you give the impression that the app aren't optimized for iOS 7.