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Editorial Team
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Asked: 2026-05-25T06:49:49+00:00

what is the code to detect whether ios app running in iPhone, iPhone Retina

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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 in XCode target/summary page the specific images for: iPhone launch image, iPhone retina display launch image, iPad portrait & iPad landscape.

  • in the main view there is a UIImageView subview I use for the background image – currently I’m specifying this in XCode (not programmatically) by selecting the image I use for the iPhone launch image.

So I’m asking how to tell which one I’m running within so that in the viewDidLoad I can load the appropriate resolution background image. Then there should be a seamless transition between the background image for app startup, and the background of the app main screen once it’s started.

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1 Answer

  1. Editorial Team

    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.

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