在ScrollView中阻止向下滚动-SwiftUI

Question

如何阻止向下滚动并仅允许向上滚动，以免滚动时看到顶部矩形上方的空白？

interface

Answer 1

我假设您想避免弹跳，这是可行的方法（已通过Xcode 12 / iOS 14测试）

struct ContentView: View {

    var body: some View {
        GeometryReader { geo in
            ScrollView {
                Rectangle()
                .frame(width: geo.size.width, height: 1800)
                .foregroundColor(.black)
                .background(ScrollViewConfigurator {
                    $0?.bounces = false               // << here !!
                })
                Spacer()
            }
        }
    }
}

struct ScrollViewConfigurator: UIViewRepresentable {
    let configure: (UIScrollView?) -> ()
    func makeUIView(context: Context) -> UIView {
        let view = UIView()
        DispatchQueue.main.async {
            configure(view.enclosingScrollView())
        }
        return view
    }

    func updateUIView(_ uiView: UIView, context: Context) {}
}

注意：enclosingScrollView()助手来自我在How to scroll List programmatically in SwiftUI?的答案中