ios - SwiftUI还在ScrollView中创建自定义分段控件

下面是我创建标准分段控件的代码。

struct ContentView: View {

    @State private var favoriteColor = 0
    var colors = ["Red", "Green", "Blue"]

    var body: some View {
        VStack {
            Picker(selection: $favoriteColor, label: Text("What is your favorite color?")) {
                ForEach(0..<colors.count) { index in
                    Text(self.colors[index]).tag(index)
                }
            }.pickerStyle(SegmentedPickerStyle())

            Text("Value: \(colors[favoriteColor])")
        }
    }
}

我的问题是，如何修改它以具有自定义的分段控件，在其中可以将边界和自己的颜色四舍五入，因为使用UIKit有点容易吗？有没有人做到这一点。

最好的例子是Uber eats应用程序，当您选择一家餐厅时，可以通过在自定义分段控件中选择一个选项来滚动到菜单的特定部分。

包括我想要自定义的元素:



*更新*

最终设计的形象

最佳答案

这是你想要的？

import SwiftUI

struct CustomSegmentedPickerView: View {
  @State private var selectedIndex = 0
  private var titles = ["Round Trip", "One Way", "Multi-City"]
  private var colors = [Color.red, Color.green, Color.blue]
  @State private var frames = Array<CGRect>(repeating: .zero, count: 3)

  var body: some View {
    VStack {
      ZStack {
        HStack(spacing: 10) {
          ForEach(self.titles.indices, id: \.self) { index in
            Button(action: { self.selectedIndex = index }) {
              Text(self.titles[index])
            }.padding(EdgeInsets(top: 16, leading: 20, bottom: 16, trailing: 20)).background(
              GeometryReader { geo in
                Color.clear.onAppear { self.setFrame(index: index, frame: geo.frame(in: .global)) }
              }
            )
          }
        }
        .background(
          Capsule().fill(
            self.colors[self.selectedIndex].opacity(0.4))
            .frame(width: self.frames[self.selectedIndex].width,
                   height: self.frames[self.selectedIndex].height, alignment: .topLeading)
            .offset(x: self.frames[self.selectedIndex].minX - self.frames[0].minX)
          , alignment: .leading
        )
      }
      .animation(.default)
      .background(Capsule().stroke(Color.gray, lineWidth: 3))

      Picker(selection: self.$selectedIndex, label: Text("What is your favorite color?")) {
        ForEach(0..<self.titles.count) { index in
          Text(self.titles[index]).tag(index)
        }
      }.pickerStyle(SegmentedPickerStyle())

      Text("Value: \(self.titles[self.selectedIndex])")
      Spacer()
    }
  }

  func setFrame(index: Int, frame: CGRect) {
    self.frames[index] = frame
  }
}


struct CustomSegmentedPickerView_Previews: PreviewProvider {
  static var previews: some View {
    CustomSegmentedPickerView()
  }
}

关于ios - SwiftUI还在ScrollView中创建自定义分段控件，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/60804512/