Go 框架如何简化跨平台移动应用程序的开发？

package main

import (
    "github.com/fyne-io/fyne/v2"
    "github.com/fyne-io/fyne/v2/app"
    "github.com/fyne-io/fyne/v2/widget"
)

func main() {
    a := app.New()
    w := a.NewWindow("My Cross-Platform App")
    w.SetContent(widget.NewLabel("Hello, World!"))
    w.ShowAndRun()
}

package main

import (
    "github.com/fyne-io/fyne/v2"
    "github.com/fyne-io/fyne/v2/app"
    "github.com/fyne-io/fyne/v2/storage"
    "github.com/fyne-io/fyne/v2/widget"
)

func main() {
    a := app.New()
    w := a.NewWindow("Notepad")

    // 创建一个文本输入框
    text := widget.NewMultiLineEntry()
    text.PlaceHolder = "Start typing..."

    // 加载现有文件
    f, err := storage.OpenFile("notes.txt")
    if err != nil {
        fyne.LogError("Could not open file:", err)
    } else {
        r, err := f.Read()
        if err != nil {
            fyne.LogError("Could not read file:", err)
        } else {
            text.SetText(string(r))
        }
    }

    // 保存文本文件
    save := widget.NewButton("Save", func() {
        f, err := storage.CreateFile("notes.txt")
        if err != nil {
            fyne.LogError("Could not create file:", err)
        } else {
            w, err := f.Writer()
            if err != nil {
                fyne.LogError("Could not open file:", err)
            } else {
                if _, err := w.Write([]byte(text.Text)); err != nil {
                    fyne.LogError("Could not write to file:", err)
                }
            }
        }
    })

    // 组织窗口小部件
    w.SetContent(
        widget.NewVBox(
            text,
            save,
        ),
    )

    w.ShowAndRun()
}