UIImage encoderWithCoder: and initWithCoder: (PNG style)

UIImage+NSCoder.h

#import <Foundation/Foundation.h>

@interface UIImage (NSCoder)

- (void)encodeWithCoder:(NSCoder*)encoder;
- (id)initWithCoder:(NSCoder*)decoder;

@end

UIImage+NSCoder.m

#import "UIImage+NSCoder.h"

@implementation UIImage (NSCoder)

- (void)encodeWithCoder:(NSCoder*)encoder
{
  [encoder encodeDataObject:UIImagePNGRepresentation(self)];
}

- (id)initWithCoder:(NSCoder*)decoder
{
  return [self initWithData:[decoder decodeDataObject]];
}

@end