#import "UIImage+Retina4.h"#import <objc/objc-runtime.h> static Method origImageNamedMethod = nil; @implementation UIImage (Retina4) + (void)initialize { origImageNamedMethod = class_getClassMethod(self, @selector(imageNamed:)); method_exchangeImplementations(origImageNamedMethod, class_getClassMethod(self, @selector(retina4ImageNamed:)));} + (UIImage *)retina4ImageNamed:(NSString *)imageName { NSLog(@"Loading image named => %@", imageName); NSMutableString *imageNameMutable = [imageName mutableCopy]; NSRange retinaAtSymbol = [imageName rangeOfString:@"@"]; if (retinaAtSymbol.location != NSNotFound) { [imageNameMutable insertString:@"-568h" atIndex:retinaAtSymbol.location]; } else { CGFloat screenHeight = [UIScreen mainScreen].bounds.size.height; if ([UIScreen mainScreen].scale == 2.f && screenHeight == 568.0f) { NSRange dot = [imageName rangeOfString:@"."]; if (dot.location != NSNotFound) { [imageNameMutable insertString:@"-568h@2x" atIndex:dot.location]; } else { [imageNameMutable appendString:@"-568h@2x"]; } } } NSString *imagePath = [[NSBundle mainBundle] pathForResource:imageNameMutable ofType:@"png"]; if (imagePath) { return [UIImage retina4ImageNamed:imageNameMutable]; } else { return [UIImage retina4ImageNamed:imageName]; } return nil;} @end
