我试图为Path创建一个函数，将帧分成两半。

extension Path {
    mutating func divideInHalf() {
        move(to: CGPoint(x: 0, y: boundingRect.midY))
        addLine(to: CGPoint(x: boundingRect.maxX, y: boundingRect.midY))
    }
}

然而，这似乎什么也做不了。事实上，我试着用boundingRect做实验，但它根本拒绝输出任何东西。

struct ContentView: View {
    @State private var text = "waiting for value..."
    
    var body: some View {
        VStack {
            Text(text)  // This stays as "waiting for value..."
            Path { path in
                path.divideInHalf()
                text = "\(path.boundingRect.height)"  // This does nothing
            }
            .stroke()
        }
    }
}

我想这可能与使用inout变量有关，所以我也尝试这样做：

struct ContentView: View {
    @State private var text = "waiting for value..."
    
    var body: some View {
        VStack {
            Text(text)  // This stays as "waiting for value..."
            Path { path in
                path.divideInHalf()
                let rect = Path { path in 
                    path.move(to: .zero)
                    path.addLine(to: CGPoint(x: 100, y: 100))
                }.boundingRect  // Getting the value from the instance directly

                text = "\(rect.height)"  // This still does nothing
            }
            .stroke()
        }
    }
}

我试着在路径中添加更多的行，但仍然没有任何效果。有人知道boundingRect是如何工作的吗？为什么它没有输出任何东西，我错过了什么？