SwiftUI:如何计算文本视图的宽度？

GeometryReader { geometry in
    Text("Hello, World!")
        .frame(width: geometry.size.width, height: geometry.size.height)
}

struct TextView: View {
    @State private var textWidth: CGFloat = .zero
    
    var body: some View {
        Text("Hello, World!")
            .background(
                GeometryReader { geometry in
                    Color.clear.preference(
                        key: TextWidthPreferenceKey.self,
                        value: geometry.size.width
                    )
                }
            )
            .onPreferenceChange(TextWidthPreferenceKey.self) { width in
                self.textWidth = width
            }
    }
}

struct ContentView: View {
    var body: some View {
        TextView()
            .frame(width: textWidth, height: 100)
    }
}

import UIKit

struct ContentView: View {
    var body: some View {
        let text = "Hello, World!"
        let font = UIFont.systemFont(ofSize: 16)
        let size = (text as NSString).size(withAttributes: [.font: font])
        
        return Text("Hello, World!")
            .frame(width: size.width, height: size.height)
    }
}