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我想编写一个类似画廊的程序，其中动态显示图片，即，我将一些图像源放入列表中，然后进入另一个屏幕查看它们。这是下面的相关代码：

from kivy.uix.stacklayout import StackLayout
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.image import Image

Builder.load_string(
    """
<GalleryScreen>:
    BoxLayout:
        Button:
            text: "insert picture 2"
            on_press: app.insert_pic2()
        Button:
            text: "goto screen"
            on_press: root.manager.current = "stack"
            
<StackScreen>:
    BoxLayout:
        DisplayStack:
        Button:
            text: "go back"
            on_press: root.manager.current = "gallery"
    """
)


class GalleryScreen(Screen):
    pass


class StackScreen(Screen):
    pass


class DisplayStack(StackLayout):

    def __init__(self, **kwargs):
        super(DisplayStack, self).__init__(**kwargs)
        for i in self.pics:
            surse = i
            st = Image(size_hint=(.2, .2), source=surse)
            self.add_widget(st)


class GalleryApp(App):
    pics = ['Pictures/1.png']

    def insert_pic2(self):
        self.pics.append("Pictures/2.jpg")


    def build(self):
        sm = ScreenManager()
        sm.add_widget(GalleryScreen(name='gallery'))
        sm.add_widget(StackScreen(name='stack'))

        return sm


if __name__ == '__main__':
    GalleryApp().run()

要点是我想从 GalleryScreen 到 StackScreen 并查看来源在“图片”列表中的图片，然后返回，在列表中插入新的图像源，然后再次进入 StackScreen 并查看新的整个列表。

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