For add UISegmentedControl on UINavigationBar.
I guess performance issues may require having separate view controllers rather than two subviews but it is much more complex - You would have a very complicated navigation system and would need to set the segment control for each view. I am sure there is another way to subclass a view but I am unfamiliar with this so would suggest having one view controller containing your views.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.