Detect when tab bar minimizes (.tabBarMinimizeBehavior)

Question

Created Jun ’25

Replies 1

Boosts 0

Participants 2

Hi! I'm working on a iOS 26 SwiftUI prototype that adds an element to the content of a screen only when the tab bar is fully visible and not minimized (via .tabBarMinimizeBehavior).

Is there any way to detect when a tab bar is minimized? My hope is that I can use a ternary operator to display something only when a boolean is true.

Here's some code to illustrate my idea:

struct ContentView: View {
  @State var isTabBarMinimized: Bool = false

  var body: some View {
      TabView {
        Tab("View1", systemImage: "rainbow") {
          // Only appears when tab bar is fully visible
          Color.blue
            .opacity(isTabBarMinimized? 0 : 1 )
        }
        Tab("View2", systemImage: "rainbow") {
          View2()
        }
        Tab("View3", systemImage: "rainbow") {
          View3()
        }
        Tab("View4", systemImage: "rainbow") {
          View4()
        }
      }
      .tabBarMinimizeBehavior(.onScrollDown)
    }
  }

Boost

Answer 1

khimeister OP

3w

You should be able to use a placement environment variable and use onChange to detect a change of the variable.

Place this in your ContentView

@Environment(\.tabViewBottomAccessoryPlacement) var placement

Then use onChange to detect the change between inline and expanded.

However, it seems that this environment property might be broken as of now. I have attempted to use it to create custom views for the minimized/inline accessory with no success.

0