When scroll to the bottom then scroll up, some cells are not show !

[flypigz]

some cells are removed unexpectedly, and i can see the gray background...

this issue is not 100% reproduceable, just try several times.

just test with the demo project.

btw, I tested on IOS7 device and simulator.

[flypigz]

I have used Reveal.app to debug this issue, when some cells are missed from the screen, there are many duplicated cells added to the screen!!!!! There must be a serious issue for the layout algorithm! if you want I can send you the screen shot, or you can print the subviews of the tableView.