SwiftUI行高列表-如何控制？

Question

我在SwiftUI中有一个简单的List。代码和屏幕截图如下。我想减少列表中每一行的高度（以使行和文本行之间的间距更小）。

我已经尝试过向HStack添加“ .frame（height：20）”，但是它仅允许增加行距！

有没有办法做到这一点？

谢谢！

杰拉德

import SwiftUI

struct PressureData: Identifiable {
  let id: Int
  let timeStamp: String
  let pressureVal: Int
}

struct ContentView : View {
  @State var pressureList = [
    PressureData(id: 0, timeStamp: "11:49:57", pressureVal: 10),
    PressureData(id: 1, timeStamp: "11:49:56", pressureVal: 8),
    PressureData(id: 2, timeStamp: "11:49:55", pressureVal: 9),
    PressureData(id: 3, timeStamp: "11:49:54", pressureVal: 1),
  ]

  var body: some View {
    VStack {
        Text("Pressure Readings")
            .font(.system(size: 30))
        List(pressureList) { row in
            HStack {
               Spacer()
                Text(row.timeStamp)
                Text("--->")
                Text(String(row.pressureVal))
                Spacer()
            } .frame(height: 30)
        }
    }
  }
}

Answer 1

Use Environment variable to set min Height of the row in the list and after that change the HStack frame height to your desired height.

Here is the code:

var body: some View {
    VStack {
        Text("Pressure Readings")
            .font(.system(size: 30))
        List(pressureList) { row in
            HStack {
                Spacer()
                Text(row.timeStamp)
                Text("--->")
                Text(String(row.pressureVal))
                Spacer()
            }.frame(height: 10)
        }.environment(\.defaultMinListRowHeight, 10)
        }
  }

Here is the output: