Loads iPad and iPhone images according to Apple's naming convention. Nice for retina displays

UIImage+CompatibleImage.m

//
//  UIImage+CompatibleImage.m
//  Notescast 3.6
//
//  Created by Sam Stewart on 8/25/13.
//
//

#import "UIImage+CompatibleImage.h"

@implementation UIImage (CompatibleImage)

+ (UIImage*)compatibleImage:(NSString*)basename {
    // build up the string
    NSString *ext = [basename pathExtension];
    
    basename = [basename stringByDeletingPathExtension];
    
    float scale = [[UIScreen mainScreen] scale];
    
    BOOL isiPhone5 = (CGRectGetHeight([UIScreen mainScreen].bounds) * scale == 568.0);
    
    if (isiPhone5) {
        basename = [basename stringByAppendingString:@"-568h"];
    } else {
        if (UIInterfaceOrientationIsLandscape([UIApplication sharedApplication].statusBarOrientation) && ! isiPhone5) {
            basename = [basename stringByAppendingString:@"-Landscape"];
        } else {
            basename = [basename stringByAppendingString:@"-Portrait"];
        }
    }

    if (scale == 2.0) {
        basename = [basename stringByAppendingString:@"@2x"];
    }
    
    
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
        basename = [basename stringByAppendingString:@"~ipad"];
    } else {
        basename = [basename stringByAppendingString:@"~iphone"];
    }
    
    basename = [basename stringByAppendingPathExtension:ext];
    NSLog(@"Compatible Image Name: %@", basename);
    return [UIImage imageNamed:basename];
}
@end