aspect fill image

fill_image

- (void)drawRect:(CGRect)rect
{
  if (!self.image) {
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, self.backgroundColor.CGColor);
    CGContextFillRect(context, rect);
    return;
  }

  CGFloat w = CGRectGetWidth(self.frame);
  CGFloat h = CGRectGetHeight(self.frame);
  CGSize imageSize = self.image.size;

  CGFloat widthScaleFactor = w / imageSize.width;
  CGFloat heightScaleFactor = h / imageSize.height;

  if (widthScaleFactor - heightScaleFactor < 0) {
    CGFloat width = (imageSize.width / imageSize.height) * h;
    CGFloat x = (w - width) / 2.0;
    CGFloat y = 0.0;
    [self.image drawInRect:CGRectMake(x, y, width, h)];
  } else {
    CGFloat height = (imageSize.height / imageSize.width) * w;
    CGFloat x = 0.0;
    CGFloat y = (h - height) / 2.0;
    [self.image drawInRect:CGRectMake(x, y, w, height)];
  }
}