Creating a 3D Border for an ImageView in iOS

I am working on an application which is used to change the orientation of the Image view and also provide a shadow to it. I have succeeded in that and the only obstacle remaining here is the fact that I have not been able to provide a 3D border to it as shown in this Image.

Look at the 3D border on the left and Bottom edge of this image view.

Please guide me to create this effect. Thanks in advance.