Dec 282012
 

Not my code, but too awesome not to share. See carlj’s https://gist.github.com/3782351

+ (UIImage*)imageNamedForDevice:(NSString*)name {
    
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
        if (([UIScreen mainScreen].bounds.size.height * [UIScreen mainScreen].scale) >= 1136.0f) {
            //Check if is there a path extension or not
            if (name.pathExtension.length) {
                name = [name stringByReplacingOccurrencesOfString: [NSString stringWithFormat:@".%@", name.pathExtension]
                                                       withString: [NSString stringWithFormat:@"-568h@2x.%@", name.pathExtension ] ];
            } else {
                name = [name stringByAppendingString:@"-568h@2x"];
            }
            
            //load the image e.g from disk or cache
            UIImage *image = [UIImage imageNamed: name ];
            if (image) {
                //strange Bug in iOS, the image name have a "@2x" but the scale isn't 2.0f
                return [UIImage imageWithCGImage: image.CGImage scale:2.0f orientation:image.imageOrientation];
            }
        }
    }
    return [UIImage imageNamed: name ];
}

What does it do?

Apple lets you have a Default image name Default-568@2x for the newer 4″ tall iPhones. What if your app needs a specific graphic, say a background image, while running? Easy!

[UIImage imageNamedForDevice:@"background.png"]

And just make sure you have background.png, background@2x.png and background-568@2x.png in your app and you’re good to go!

This has been incorporated into the open source EnkiUtils.