Creating casual resizable image

UIImage+ADVImageResizing.h

//
//  Copyright © 2013 Yuri Kotov
//

#import <UIKit/UIKit.h>

@interface UIImage (ADVImageResizing)

- (UIImage *) resizableImage;

@end

UIImage+ADVImageResizing.m

//
//  Copyright © 2013 Yuri Kotov
//

#import "UIImage+ADVImageResizing.h"
#import <tgmath.h>

NS_INLINE UIEdgeInsets InsetsForSize(CGSize size)
{
    CGFloat top = floor(size.height / 2.f);
    CGFloat left = floor(size.width / 2.f);
    return UIEdgeInsetsMake(top, left, top - 1.f, left - 1.f);
}

@implementation UIImage (ADVImageResizing)

- (UIImage *) resizableImage
{
    return [self resizableImageWithCapInsets:InsetsForSize(self.size)];
}

@end