~~~ func updateTime(clock *widget.Label) { formatted := time.Now().Format("Time: 03:04:05") clock.SetText(formatted) } func main() { a := app.New() w := a.NewWindow("天下第一") clock := widget.NewLabel("") w.SetContent(clock) go func() { for range time.Tick(time.Second) { updateTime(clock) } }() w.Resize(fyne.NewSize(500, 300)) w.ShowAndRun() } ~~~