Question

我刚刚开始使用Kivy。我正在制作一个使用多个屏幕的应用程序。通过界面上部的按钮选择屏幕。每个屏幕代表程序的不同功能。现在问题来了：我创建了一个可以更改屏幕1上的Label文本的函数。该函数似乎可以正常工作，但是当按下“ Change Label”按钮时Label文本不会更改。可能是什么问题？我一直在寻找类似的答案，但是无关，一切都应该在AFAIK上正常工作。代码如下：

from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.boxlayout import BoxLayout

class Display(BoxLayout):
    pass

class Screen_One(Screen):

    mytext = "Initial Text"

    def change_text(self,input):
    self.mytext = input

class Screen_Two(Screen):
    pass

class Screen_Three(Screen):
    pass

class MyNewApp(App):
    def build(self):
    return Display()

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

.kv文件

<Display>:
BoxLayout:
    orientation: "vertical"

    BoxLayout:
        size_hint: 1, None
        height: '48dp'
        Button:
            text: 'One'
            on_release: sm.current = 'screen_one'  
        Button:
            text: 'Two'
            on_release: sm.current = 'screen_two' 
        Button:
            text: 'Three'
            on_release: sm.current = 'screen_three'  
    ScreenManager:
        id: sm
        Screen_One:
        Screen_Two:
        Screen_Three:

<Screen_One>:
    name: 'screen_one'      
    BoxLayout:
        orientation: "vertical"
        Button:
            text: 'Change Label'
            on_press:root.change_text("New Text")
        Button:
            text: 'For Later'

        BoxLayout:
            orientation: "vertical"
            Label:
                text: root.mytext



<Screen_Two>:
    name: 'screen_two'      
    Button:
        text: 'Two'

<Screen_Three>:
    name: 'screen_three'
    Button:
        text: "Three"

谢谢您的回答

Kivy Framework：使用ScreenManager时标签文本不会更新

0 个答案: