Detecting Retina Support
In recent years, Apple has converted all but a few lower-cost devices to Retina displays. Pixel density of Retina displays, according to Apple, is high enough that the human eye cannot distinguish individual pixels. Apps shipped with higher-resolution art take advantage of this improved display quality.
The UIScreen class offers an easy way to check whether the current device offers a built-in Retina display. Check the screen scale property, which provides the factor that converts from the logical coordinate space (points, each approximately 1/160 inch) into a device coordinate space (pixels). It is 1.0 for standard displays, so 1 point corresponds to 1 pixel. It is 2.0 for Retina displays (4 pixels per point):
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