Question

我是Kivy的新手，我不得不认为这是可能的，但我无法弄清楚 - 如何在按下按钮时更新Kivy标签，但只能通过参考在Python中的Kivy id？（我试图这样做的原因是因为在我的实际应用程序中，我希望一次更新几个标签，我希望我可以在等效按钮内完成所有操作在我的应用程序）。

在下面的简单示例中，我只是尝试按下按钮，然后将标签更新为“已更新！”＆＃39;

非常感谢！

我的Python代码：

button_pressed

我的kv档案：

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.widget import Widget
from kivy.properties import StringProperty
import random


class TestingWidget(BoxLayout):

    # This is the kv id of the Label I would like to update
    label_to_update = StringProperty('')

    # This is the action I would like to happen when the button is pressed
    def button_pressed(self):
        label_to_update.text = 'Updated!'

class TestButtonApp(App):
    def build(self):
        return TestingWidget()

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

Answer 1

按下按钮时，您肯定会更新所有标签。只需为每个人创建一个StringProperty并执行你现在正在做的事情。

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.widget import Widget
from kivy.properties import StringProperty
from kivy.lang import Builder #used because I didn't want to create two files

import random

Builder.load_string('''
<TestingWidget>:
    BoxLayout:
        orientation: 'horizontal'
        Button: 
            text: 'test'
            on_press: root.button_pressed()
        Label:
            id: label_to_update
            text: root.label_to_update 
            ''')
class TestingWidget(BoxLayout):

    # This is the kv id of the Label I would like to update
    label_to_update = StringProperty('Trying to get this to update')
    #default text set
    # This is the action I would like to happen when the button is pressed
    def button_pressed(self):
        self.label_to_update = 'Updated!'

class TestButtonApp(App):
    def build(self):
        return TestingWidget()

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

Kivy：如何在Python中引用kv ID？

1 个答案: