使用Kivy Screen Manager,我创建了两个Screens.在屏幕1中,我想在屏幕2中更改标签.我在我的代码中突出显示了有问题的区域：
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"
和我的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()
任何帮助是极大的赞赏！
谢谢,尼科
解决方法
这个怎么样：
当您按下MenuScreen上的按钮时,它会在其自身上设置一个属性,其中包含您要放入SettingsScreen标签中的文本.然后在菜单屏幕中为kv文件分配一个id值,该值用于引用此属性.例：
main.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
正如您所看到的,我在屏幕管理器中设置了屏幕的名称和ID在kv文件中,因为这是我通常要做的工作.