(iOS) Split an image into an array of evenly sized CALayers

UIImage+ImageSplitting.h

//
//  UIImage+ImageSplitting.h
//  Test
//
//  Created by Robert Saunders on 03/02/2012.
//  Copyright (c) 2012 __MyCompanyName__. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface UIImage (ImageSplitting)


// Returns a NSArray of CALayers of the original image split evently into rectangles
// The possition attribute of the layers relative to the origianl image is preserved.
- (NSArray*) splitImagesIntoSubImagesWithNumberOfRows:(NSUInteger)rows numberOfColumns:(NSUInteger)clms;

@end

UIImage+ImageSplitting.m

//
//  UIImage+ImageSplitting.m
//  Test
//
//  Created by Robert Saunders on 03/02/2012.
//  Copyright (c) 2012 __MyCompanyName__. All rights reserved.
//

#import "UIImage+ImageSplitting.h"
#import <QuartzCore/QuartzCore.h>

@implementation UIImage (ImageSplitting)

- (NSArray*) splitImagesIntoSubImagesWithNumberOfRows:(NSUInteger)rows numberOfColumns:(NSUInteger)clms 
{
    float scale = [[UIScreen mainScreen] scale];
    
    float height = self.size.height * scale;
    float width  = self.size.width * scale;
    
    NSMutableArray *subImages = [NSMutableArray array];
    
    for(int y = 0; y < rows; y++) {
        for(int x = 0; x < clms; x++) {
            
            CGRect frame = CGRectMake((width / clms) * x,
                                      (height / rows) * y,
                                      (width / clms),
                                      (height / rows));
                                                                                                             
            CGImageRef subimageRef = CGImageCreateWithImageInRect(self.CGImage, frame);
            
            UIImage* subImage = [UIImage imageWithCGImage:subimageRef scale:scale orientation:UIImageOrientationUp];
            
            
            
            CFRelease(subimageRef);
            [subImages addObject:subImage];
        }
    }
    return subImages; 
}

@end

UIImageImageSplitting.h

//
//  UIImage+ImageSplitting.h
//  Test
//
//  Created by Robert Saunders on 03/02/2012.
//  Copyright (c) 2012 __MyCompanyName__. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface UIImage (ImageSplitting)


// Returns a NSArray of CALayers of the original image split evently into rectangles
// The possition attribute of the layers relative to the origianl image is preserved.
- (NSArray*) splitImagesIntoSubImagesWithNumberOfRows:(NSUInteger)rows numberOfColumns:(NSUInteger)clms;

@end

UIImageImageSplitting.m

//
//  UIImage+ImageSplitting.m
//  Test
//
//  Created by Robert Saunders on 03/02/2012.
//  Copyright (c) 2012 __MyCompanyName__. All rights reserved.
//

#import "UIImage+ImageSplitting.h"
#import <QuartzCore/QuartzCore.h>

@implementation UIImage (ImageSplitting)

- (NSArray*) splitImagesIntoSubImagesWithNumberOfRows:(NSUInteger)rows numberOfColumns:(NSUInteger)clms 
{
    float scale = [[UIScreen mainScreen] scale];
    
    float height = self.size.height * scale;
    float width  = self.size.width * scale;
    
    NSMutableArray *subImages = [NSMutableArray array];
    
    for(int y = 0; y < rows; y++) {
        for(int x = 0; x < clms; x++) {
            
            CGRect frame = CGRectMake((width / clms) * x,
                                      (height / rows) * y,
                                      (width / clms),
                                      (height / rows));
                                                                                                             
            CGImageRef subimageRef = CGImageCreateWithImageInRect(self.CGImage, frame);
            
            UIImage* subImage = [UIImage imageWithCGImage:subimageRef scale:scale orientation:UIImageOrientationUp];
            
            
            
            CFRelease(subimageRef);
            [subImages addObject:subImage];
        }
    }
    return subImages; 
}

@end