Example of resolving image sets depending on display size

gistfile1.m

#import "UIImage+ImageAdditions.h"

@implementation UIImage (ImageAdditions)

+ (NSString *)resolveAdaptiveImageName:(NSString *)nameStem {
    CGFloat height = [UIScreen mainScreen].bounds.size.height;
    if (height > 568.0f) {
        // Oversize @2x will be used for iPhone 6, @3x for iPhone 6+
        // iPads... we'll work that out later
        if (height > 667.0f) {
            return [nameStem stringByAppendingString:@"-oversize@3x"];
        } else {
            return [nameStem stringByAppendingString:@"-oversize"];
        }
    };
    return nameStem;
}

+ (UIImage *)adaptiveImageNamed:(NSString *)name {
    return [self imageNamed:[self resolveAdaptiveImageName:name]];
}

@end