Its simple just set the UITableView background for iOS 6 to white and for iOS 7 make it clear
if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_6_1) {
// Load resources for iOS 6.1 or earlier
} else if (isPresentedWithPopOver) {
// Load resources for iOS 7 or later
} else {
// Load resources for iOS 7 or later
}