Vertical Sliding of xib while we drag using finger using Objective-C

I have a Main view(currently displayed view).

AnotherView is added as a subview to a scrollview.The initial position of this AnotherView has to be in such a way that the bottom of this another view appears on the top most portion of the MainView.

Now,when I drag the AnotherView's bottom portion downwards,AnotherView should get displayed as SLIDING from top to bottom with the speed I drag it.

When I stop dragging,the sliding also should halt.

If I release the dragging after half of the screen,the sliding should continue to bottom of the screen.

How could I achieve this ?