Kivy 如何隱藏控件？

設置opacity 屬性爲0即可， 如下面的例子，當Button 1按下時整個Boxlayout都隱藏起來

#:kivy 1.4

BoxLayout:
    orientation: 'vertical'
    padding: 20
    spacing: 10
    opacity:1
    Button:
        text: "Button 1"
        on_release: self.parent.opacity=0
        size_hint: 1, None
    Button:
        text: "Button 2"
        size_hint: 1, 0.5
    Button:
        text: "Button 3"