what is the code to detect whether ios app running in iPhone, iPhone Retina display, or iPad?

Question

what is the code to detect whether ios app running in iPhone, iPhone Retina display, or iPad?

Background:

• for my iPhone application I have defined i

Answer 1

For Swift Solution:

 if (UIDevice.currentDevice().userInterfaceIdiom == UIUserInterfaceIdiom.Pad)     
 {
        // Ipad
 }
 else 
 {
       // Iphone
 }