如何在Kivy Spinner中通过单击值来更改图像的来源？

Question

想要制作带有许多图片的简单App。无法理解如何在main.py中定义它。我陷入了Spinner按钮事件on_release的困扰。该代码是我尝试执行的操作，但对我不起作用。

文件main.py

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout

class Container(BoxLayout):
    pass    


class testApp(App):
    def build(self):


        return Container()

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

test.kv代码：

<Container>:
    Spinner:
        text: "Map"
        values:"Main plan","Center", "Block A", "Block B", "Block C"
        size_hint: None, None
        size: 155, 44
        pos:2,333

        #on_release: values=("Main plan").imageplan.source='400px.jpg' 
        #on_release: values=("Center").imagecenter.source='center.jpg'
        #on_release: values=("Block A").imageblocka.source='blocka.jpg'

        Image:
            id:imageplan
            source:'mylogo.png'
            size:100,100
            size_hint:None,None
            pos:200,200

Answer 1

您可以使用DictProperty将Spinner的值与Image中显示的内容相关联。

from kivy.app import App
from kivy.properties import DictProperty
from kivy.uix.boxlayout import BoxLayout


class Container(BoxLayout):
    options = DictProperty(
        {"Main plan": "400px.jpg", "Center": "center.jpg", "Block A": "blocka.jpg"}
    )


class testApp(App):
    def build(self):
        return Container()


if __name__ == "__main__":
    testApp().run()

<Container>:
    Spinner:
        id: spinner
        text: "Map"
        values: root.options.keys()
        size_hint: None, None
        size: 155, 44
        pos:2,333

        Image:
            id:imageplan
            source: root.options.get(spinner.text, "mylogo.png")
            size:100,100
            size_hint:None,None
            pos:200,200