When doing iOS view layouts I end up needing to center CGRects within a CGRect while maintaining on pixel origin and size. This will do just that.

Center CGRect in CGRect

CG_INLINE CGRect CGRectIntegralCenteredInRect(CGRect innerRect, CGRect outerRect)
{
    CGFloat originX = floorf((outerRect.size.width - innerRect.size.width) * 0.5f);
    CGFloat originY = floorf((outerRect.size.height - innerRect.size.height) * 0.5f);
    return CGRectMake(originX, originY, innerRect.size.width, innerRect.size.height);
}