如何使用 GeometryReader 而不填充视图

这就是我想要的布局。

import SwiftUI
import PlaygroundSupport

struct TestView: View {
        
    let text: String
    
    var body: some View {
        Text(self.text)
    }
}

struct ContentView: View {
    var body: some View {
        ZStack {
            TestView(text: "bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla")
                .frame(width: 250)
                .background(Color.red)
        }
    }
}

PlaygroundPage.current.setLiveView(ContentView())

但我也想使用GeometryReader当我把Text在 - 的里面GeometryReader它将占据整个高度。

import SwiftUI
import PlaygroundSupport

struct TestView: View {
        
    let text: String
    
    var body: some View {
        GeometryReader { reader in
            Text(self.text)
        }
    }
}

struct ContentView: View {
    var body: some View {
        ZStack {
            TestView(text: "bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla")
                .frame(width: 250)
                .background(Color.red)
        }
    }
}

PlaygroundPage.current.setLiveView(ContentView())

我该如何解决这个问题？

警告⚠️：此时几何读者无法帮助我学习几何，我开始用头撞墙

您可以执行以下操作：

struct ContentView: View {

    var text =  "bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla"
    var width : CGFloat = 250

    var height: CGFloat {
        var size : CGFloat
        let chars = self.width / 14  // assuming width of 1 character is 14 which is the case by default for Text view
        let lines = CGFloat(text.count) / chars
        size = CGFloat(14 * (lines + 1))
        return size
    }

    var body: some View {
        ZStack {
            TestView(text: text)
            .frame(width: width, height: height)
            .background(Color.red)
        }
    }
}

使用高度作为计算属性来手动设置 TestView 的高度。

关于我如何估计默认字体高度的背景故事

Press shift + command + 4 Use the pointer and find the difference between the relative y positions