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Question

我想在新闻提要上创建一个查看更多... 功能，非常类似于 Facebook。 SwiftUI 列表有行，一行由 (HStack (username, post time) 的 VStack、文本（默认仅显示 2 行并且可扩展以显示所有行已切换）和最后的图像组成自定义大小。我能够实现切换并将 lineLimit 设置为 nil 以反映这一点，但问题是顶部 HStack 超出行的高度并隐藏在前一行的后面。我使用绑定变量来触发视图刷新但没有结果。

Answer 1

这是一个工作示例，说明如何使用 ScrollView 和表示行的简单 struct 实现此目的：

import SwiftUI

struct FeedList: View {
    var body: some View {
        ScrollView {
            ForEach(1...50, id: \.self) { item in
                VStack {
                    FeedRow()
                    Divider()
                }
            }
        }
    }
}

struct FeedRow: View {

    @State var value: Bool = false

    var body: some View {
        VStack {
            HStack {
                Text("Username")
                Text("17:17h")
            }
            .padding(10)
            Text("I would like to create a See more... feature on the news feed, pretty much like Facebook. The SwiftUI list has rows, a row is composed of a VStack of (HStack (username, post time), Text (showing only 2 lines by default and expendable to show all of it is toggled) and finally an image with custom size. I was able to implement the toggle and set lineLimit to nil to reflect that but the problem is that the top HStack is outside the height of the row and hidden behind the previous row. I used a binding variable to trigger the views to refresh but ho results.")
                .fixedSize(horizontal: false, vertical: true)
                .lineLimit(self.value ? nil : 2)
                .padding(.horizontal, 10)
            HStack {
                Spacer()
                Button(action: {
                    withAnimation {
                        self.value.toggle()
                    }
                }, label: {
                    if self.value {
                        Text("show less")
                    } else {
                        Text("show more")
                    }
                }).padding(.horizontal, 10)
            }
        }
        .animation(.easeInOut)
    }
}

struct ContentView: View {

    var body: some View {
        FeedRow()
    }

}

还有一些问题，希望对你有所帮助！

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