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

You can use [[UIDevice currentDevice] userInterfaceIdiom] to determine whether you're running on an iPhone/iPod touch or an iPad.

There's often no need to determine directly whether you're on a retina display because UIImage handles that automatically when you use imageNamed and append "@2x" to your high resolution image file names (see Supporting High-Resolution Screens in the Drawing and Printing Guide for iOS).

If you really need to know which resolution the screen has, use UIScreen's scale method.