Swift - Navigation Bar won't hide on scroll

Question

I am posting this after following this thread:

How to hide the navigation bar and toolbar as scroll down? Swift (like myBridge app)

I have the following Nav bar:

And I want it to disappear when I scroll down in the UICollectionView and appear when I scroll up.

I have added the code from the posted thread above:

func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {

    if(velocity.y>0) {
        UIView.animate(withDuration: 2.5, delay: 0, options: UIViewAnimationOptions(), animations: { 
            self.navigationController?.setNavigationBarHidden(true, animated: true) 
            self.navigationController?.setToolbarHidden(true, animated: true)
            print("Hide")
        }, completion: nil)

    } else {
        UIView.animate(withDuration: 2.5, delay: 0, options: UIViewAnimationOptions(), animations: { 
            self.navigationController?.setNavigationBarHidden(false, animated: true)
            self.navigationController?.setToolbarHidden(false, animated: true)
            print("Unhide")
        }, completion: nil)    
      }
   }

But when I scroll down it won't disappear (Neither will the TabBar).

Can someone point me to what I might be doing wrong? Does it have anything to do with the fact I am scrolling the UICollectionView and perhaps not the View?

Try adding `layoutIfNeeded()` in the animation block before your print statements. — inokey, Sep 14 '18 at 07:19
Value of type 'ProductsCollectionViewController' has no member 'layoutIfNeeded' — Ofri, Sep 14 '18 at 07:28
You need to apply it to root view of ViewController... `self.view.layoutIfNeeded()` — inokey, Sep 14 '18 at 07:32
Okay, then the problem is that your method `scrollViewWillEndDragging` is not being invoked. You need to make your `ViewController` a UIScrollView delegate. — inokey, Sep 14 '18 at 09:23

Swift - Navigation Bar won't hide on scroll

0 Answers0