問題描述

使用 Kivy 屏幕管理器，我創(chuàng)建了兩個(gè)屏幕.在屏幕 1 中，我想更改屏幕 2 中的標(biāo)簽.我在我的代碼中突出顯示有問題的區(qū)域:

Using the Kivy Screen Manager, I create two Screens. Whilst being in screen 1, i want to change a label in screen two. I highlight the problematic area in my code:

我的test.ky:

#: import ScreenManager kivy.uix.screenmanager.ScreenManager
#: import Screen kivy.uix.screenmanager.ScreenManager
#: import SettingsScreen screen


ScreenManager:
    MenuScreen:
    SettingsScreen:


<MenuScreen>:
    name: 'MenuScreen'
    BoxLayout:
        Button:
            text: 'Goto nn'
            on_press: 
                root.manager.current = 'SettingsScreen'
                root.change_text()


<SettingsScreen>:
    name: 'SettingsScreen'
    label_id: label_field
    BoxLayout:
        Label:
            id: label_field
            text: "to_be_changed"

還有我的 screen.py

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


class MenuScreen(Screen):
    def change_text(self):
        pass
        # HERE: something like
        # root.SettingsScreen.label_field.text = 'new text'


class SettingsScreen(Screen):
    pass


class TestApp(App):
    pass

TestApp().run()

非常感謝任何幫助！謝謝，尼科

Any help is greatly appreciated! Thanks, Nico

推薦答案

這個(gè)怎么樣:

當(dāng)您按下 MenuScreen 上的按鈕時(shí)，它會(huì)在自身上設(shè)置一個(gè)屬性，其中包含您要放在 SettingsScreen 標(biāo)簽中的文本.然后在kv文件中給MenuScreen分配一個(gè)id值，用來引用這個(gè)屬性.示例:

When you press the button on MenuScreen, it sets an attribute on itself containing the text you want to put in the SettingsScreen Label. Then the MenuScreen is assigned an id value in the kv file, which is used to reference this attribute. Example:

ma??in.py

class MenuScreen(Screen):
    text = StringProperty('')
    def change_text(self):
        self.text = "The text you want to set"
        self.manager.current = "SettingsScreen"

class SettingsScreen(Screen):
    label_text = StringProperty('')

kv 文件

ScreenManager:
    id: screen_manager
    MenuScreen:
        id: menu_screen
        name: 'MenuScreen'
        manager: screen_manager
    SettingsScreen:
        name: 'SettingsScreen'
        manager: screen_manager
        label_text: menu_screen.text

<MenuScreen>:
    BoxLayout:
        Button:
            text: 'Goto nn'
            on_press:
                root.change_text()

<SettingsScreen>:
    BoxLayout:
        Label:
            text: root.label_text

如您所見，我在 kv 文件中的 ScreenManager 下設(shè)置了屏幕的名稱和 id，因?yàn)檫@是我通常會(huì)做的事情.

As you can see, I set the names and id of the screens under ScreenManager itself in the kv file, as this is what I would usually do to make this work.

這篇關(guān)于Kivy - 屏幕管理器 - 訪問其他類中的屬性的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！