在 SwiftUI 中滚动时隐藏导航栏? [英] Hide navigation bar on scroll in SwiftUI?

问题描述

在 Swift 中使用 navigationController?.hidesBarsOnSwipe = true 支持在滚动时隐藏导航栏

明确地说，我希望它只在滚动时隐藏，所以 .navigationBarHidden(true) 是不够的.

我尝试按照

滚动后:

Hiding the navigation bar on scroll was supported in Swift with navigationController?.hidesBarsOnSwipe = true

To be clear, I'd like it to only be hidden on scroll, so .navigationBarHidden(true) would not suffice.

I tried accessing the NavigationController as described in this Stackoverflow answer, (I added nc.hidesBarsOnSwipe = true) and while it compiled, it did not work.

Is this supported in SwiftUI?

解决方案

NavigationView seems to be relatively buggy still. For example, by default a ScrollView will ignore the title area and just scroll beneath it.

It looks to me like you can get this working by using displayMode: .inline and StackNavigationViewStyle() together.

struct ContentView: View {
    var body: some View {
        NavigationView {
            ScrollView {
                ForEach(0...20, id: \.self) { count in
                    (count % 2 == 0 ? Color.red : Color.blue)
                        .frame(height: 44.0)
                }
            }
            .background(NavigationConfigurator { nc in // NavigationConfigurator is from the OP's post: https://stackoverflow.com/a/58427754/7834914
                nc.hidesBarsOnSwipe = true
            })
            .navigationBarTitle("Hello World", displayMode: .inline)
        }
        .navigationViewStyle(StackNavigationViewStyle())
    }
}

Before Scroll:

After Scroll:

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