3种不同的故事板，用于不同的设备编程和3种不同的iAd版本

Hi i am having trouble with a 3.5 inch screen for my app , so i though to create another storyboard file for an iPhone 3.5 version though i already had a working iPad and iPhone 4 inch version working . My question is can there be 3 storyboards for each device ?1 for iPhone 4 inch main for 3.5 inch iphone and for iPad and how to recognize iAd height as well got it working for 2 versions iPad and iPhone but can't figure out for 3 heres the code for iAd Hi i am having trouble with a 3.5 inch screen f