这是我想出来的:

据我所知，SFSymbols中的battery图标只由3个元素组成，a rounded rectangle、a half circle位于电池顶部，另外rounded rectangle表示当前电池电量.

First rounded Rectangle (Battery Case)

struct BatteryView : View {
    var body: some View {
        GeometryReader { geo in
            RoundedRectangle(cornerRadius: 15)
                .stroke(lineWidth: 3)
       } 
   }
}

它看起来是这样的(frame为180，60):

我只是按照你的建议用了一个圆角矩形作为电池盒.

Half circle

为此，我创建了一个名为HalfCircleShape的简单形状.

struct HalfCircleShape : Shape {
    func path(in rect: CGRect) -> Path {
        var path = Path()
        
        path.move(to: CGPoint(x: rect.minX, y: rect.midY))
        path.addArc(center: CGPoint(x: rect.minX, y: rect.midY), radius: rect.height , startAngle: .degrees(90), endAngle: .degrees(270), clockwise: true)
        return path
    }
}

在GeometryReader帧中，我给出的帧是当前帧的1/7，因为它看起来很优雅.

我把这些和HStack

如下所示:

GeometryReader { geo in
    HStack {
        RoundedRectangle(cornerRadius: 15)
            .stroke(lineWidth: 3)
        
        HalfCircleShape()
            .frame(width: geo.size.width / 7, height: geo.size.height / 7)
    }
}

Battery Indicator

我在Color中创建了一个扩展以 Select 当前电池电量的 colored颜色

extension Color {
    static var BatteryLevel : Color {
        let batteryLevel = 0.6
        print(batteryLevel)
        switch batteryLevel {
            // returns red color for range %0 to %20
            case 0...0.2:
                return Color.red
            // returns yellow color for range %20 to %50
            case 0.2...0.5:
                return Color.yellow
            // returns green color for range %50 to %100
            case 0.5...1.0:
                return Color.green
            default:
                return Color.clear
        }
    }
}

我刚刚创造了另一个RoundedRectangle，并将这两个RoundedRectangle结合在一个ZStack中

Result looks 如下所示:

最终代码:

import SwiftUI

struct ContentView: View {
    var body: some View {
            BatteryView()
            .frame(width: 170, height: 60)
            .padding()
    }
}

struct HalfCircleShape : Shape {
    func path(in rect: CGRect) -> Path {
        var path = Path()
        
        path.move(to: CGPoint(x: rect.minX, y: rect.midY))
        path.addArc(center: CGPoint(x: rect.minX, y: rect.midY), radius: rect.height , startAngle: .degrees(90), endAngle: .degrees(270), clockwise: true)
        return path
    }
}

struct BatteryView : View {
    init() {
        UIDevice.current.isBatteryMonitoringEnabled = true
    }
    var body: some View {
        // UIDevice.current.batteryLevel always returns -1, and I don't know why. so here's a value for you to preview
        let batteryLevel = 0.4
        GeometryReader { geo in
            HStack(spacing: 5) {
                GeometryReader { rectangle in
                    RoundedRectangle(cornerRadius: 15)
                        .stroke(lineWidth: 3)
                    RoundedRectangle(cornerRadius: 15)
                        .padding(5)
                        .frame(width: rectangle.size.width - (rectangle.size.width * (1 - batteryLevel)))
                        .foregroundColor(Color.BatteryLevel)
                }
                HalfCircleShape()
                .frame(width: geo.size.width / 7, height: geo.size.height / 7)
                
            }
            .padding(.leading)
        }
    }
}

extension Color {
    static var BatteryLevel : Color {
        let batteryLevel = 0.4
        print(batteryLevel)
        switch batteryLevel {
            // returns red color for range %0 to %20
            case 0...0.2:
                return Color.red
            // returns yellow color for range %20 to %50
            case 0.2...0.5:
                return Color.yellow
            // returns green color for range %50 to %100
            case 0.5...1.0:
                return Color.green
            default:
                return Color.clear
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

此外，在UIDevice中，有一个名为batteryLevel的属性可以告诉您当前的电池电量，但在本例中，它只返回-1，注意:as discussed here，这看起来像是SWIFT中的错误.