I'd like to implement -tableView:heightForRowAtIndexPath: but only in iOS 7 and below.   
What is the appropriate compile-time directive to use so that my tableViews won't call this method if the app is running on iOS8?
I'd like to implement -tableView:heightForRowAtIndexPath: but only in iOS 7 and below.   
What is the appropriate compile-time directive to use so that my tableViews won't call this method if the app is running on iOS8?
