CALayer and [UIImage resizableImageWithCapInsets:resizingMode]

CALayer_With_ResizableImage.m

static CGRect CGRectCenterRectForResizableImage(UIImage* image) {
  return CGRectMake(image.capInsets.left / image.size.width,
                    image.capInsets.top / image.size.height,
                    (image.size.width - image.capInsets.right - image.capInsets.left) / image.size.width,
                    (image.size.height - image.capInsets.bottom - image.capInsets.top) / image.size.height);
}

...

 CALayer *layer = [CALayer layer];
 UIImage *originImage = [UIImage imageNamed:@"shopping_bg_reply"];
 UIEdgeInsets imageInset = UIEdgeInsetsMake(10, 22, 23, 8);
 UIImage *resource = [originImage resizableImageWithCapInsets:imageInset
                                                 resizingMode:UIImageResizingModeStretch];
 self.contentsCenter = CGRectCenterRectForResizableImage(self.resourceImage);
 self.contentsScale = [UIScreen mainScreen].scale;
 self.contents = (id)self.resource.CGImage;