Modal view controller hides tab bar

Question

In my tab based app, on clicking one of the tabs, I want to display a modal view controller with some info. In my app delegate's didSelectViewController method, I am adding modal view. But it occupies entire screen and hides the tab bar. I don't want to hide the tab-bar, just want to display modal-view which pops up and can be dismissed.

How do I do it?

Please help.

Thanks in advance.

Answer 1

Modal view controllers are always presented full screen on an iPhone. If you don't want to hide the tab bar, then you need to present this view in some other way besides modal.

Answer 2

I was able to "present" a new view controller, over another, UNDER the tab bar, by setting modalPresentationStyle to .currentContext.

let newViewController = UIViewController()
newViewController.view.backgroundColor = UIColor.red
newViewController.modalPresentationStyle = .currentContext
newViewController.modalTransitionStyle = UIModalTransitionStyle.flipHorizontal
present(newViewController, animated: true, completion: nil)

Edit: From more testing, the above can have some buggy behavior if someone changes the tab WHILE the newViewController is presented.

To "fix," I created a "switcher" - a UIViewController that animates between the view controllers that I want to flip UNDER the tab bar:

view.addSubview(nextView)
UIView.transition(from: currentView,
   to: nextView,
   duration: 0.5,
   options: animation,
   completion: { (_) in
      currentView.removeFromSuperview()
   })

In this case, currentView is the view of ViewControllerOne (the currently visible one), and the nextView is view of ViewControllerTwo (the one we want to present).