CellforItemAtIndexPath not getting called in GMGridview for paging?

Question

I have used the GMGridView in my App.

I have used the HorizontalLTB layout strategy for paging but when i swipe from the first page to the second page the method CellforItemAtIndexPath is not getting called.

But when i swipe from page 2 to page 3 the method is called, I want to set the dots as per the offset so i need to call this method.

What could be the solution ?