How to prevent Large Title from Collapsing

Question

The question is simple, how can I prevent a Large Title Navigation Bar from collapse when a scrollview scrolls down?

My navigation must have a large navigation bar a

Answer 1

If someone arrives here from SwiftUI land, this is a good way to keep your lists in large title mode.

// your content view ...

    var body: some View {
        VStack {
            PreventCollapseView()
            List {
                ForEach(things, id: \.self) { thing in
                    Text(thing.name)
                }
            }
        }
        .navigationBarTitle("All the things")
    }


// end of view


struct PreventCollapseView: View {

    private var mostlyClear = Color(UIColor(white: 0.0, alpha: 0.0005))

    var body: some View {
        Rectangle()
            .fill(mostlyClear)
            .frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: 1)
    }
}

Answer 2

A workaround i figured out is to add a placeholder view that is not CollectionView/TableView as the very first view in ViewController's base view. This first view will be attached to the top of the safeArea, height can be zero.

Using Storyboard/Xib:

See the below screenshot for this view with constraints

Next add another UIView to serve as a container view for your TableView/CollectionView. This container's top will be attached to bottom of the placeholder view. See the below screenshot for constraints of container view and TableView/CollectionView.

The key here is the first view in the view hierarchy as the navigation bar will check that to set the collapsing effect. Once it does not find it as a CollectionView/TableView, it will not collapse on scrolling.

Programmatically:

If you are setting up view's programmatically then you just need to add a placeholder view at the top.

e.g,

self.view.addSubview(UIView(frame: .zero))
self.view.addSubview(tableView) // or collectionView

Answer 3

To prevent the large tile nav bar from collapsing simply add a second view to your UIViewController in the viewDidLoad method.

view.addSubview(UIView())

For whatever reason, this breaks the link between your the UIScrollView and the nav bar.