gistfile1.m

- (void)sizeToFitWithAnchorPoint:(AnchorPoint)anchorPoint
{
   CGRect srcFrame = self.frame;
   [self sizeToFit];
   CGRect dstFrame = self.frame;
   CGPoint p = dstFrame.origin;
   switch (anchorPoint) {
       case AnchorPointRightTop:
           p = CGPointMake(
                   CGRectGetMaxX(srcFrame) - dstFrame.size.width,
                   srcFrame.origin.y
                   );
           break;
       case AnchorPointLeftBottom:
           p = CGPointMake(
                   srcFrame.origin.x,
                   CGRectGetMaxY(srcFrame) - dstFrame.size.height
                   );
           break;
       case AnchorPointRightBottom:
           p = CGPointMake(
                   CGRectGetMaxX(srcFrame) - dstFrame.size.width,
                   CGRectGetMaxY(srcFrame) - dstFrame.size.height
                   );
           break;
       case AnchorPointLeftTop:
       default:
           break;
   }
   dstFrame.origin = p;
   self.frame = dstFrame;
}