我有一个滑块，该滑块的值会更改标签。这很容易理解。现在的问题是我想使用此值在另一个屏幕上显示。最终，我希望滑块在另一个屏幕上显示1-16张图像，具体取决于滑块上选择的值。以下是我目前的情况，该屏幕在该屏幕上效果很好，但是如何获取此值以显示在另一个屏幕上？我知道我必须创建一个类，该类已经进行了多次尝试，并且每次尝试都比让我更好地理解它使我更加困惑。
<NewGameScreen>:
name: 'newgame'
BoxLayout:
orientation: 'vertical'
height: 100
Label:
text: 'New Game'
font_size: 70
Label:
text: 'Players'
font_size: 30
pos: 300, 400
Slider:
id: s1
pos: 420, 400
width: '250dp'
min: 1
max: 16
step: 1
value: 1
on_value: s1.value = self.value
Label:
text: '{}'.format(s1.value)
font_size: 30
pos: 670, 400
您可以通过底层传递值ScreenManager。一个工作示例：
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
kv = '''
<NewGameScreen>:
name: 'newgame'
BoxLayout:
orientation: 'vertical'
Slider:
id: s1
min: 1
max: 16
step: 1
value: 1
on_value:
root.manager.get_screen('options').label.text = str(self.value)
Button:
text: 'Options'
on_press:
root.manager.transition.direction = 'left'
root.manager.current = 'options'
<OptionScreen>:
label: label
name: 'options'
orientation: 'vertical'
BoxLayout:
Button:
text: 'Go back'
on_press:
root.manager.transition.direction = 'right'
root.manager.current = 'newgame'
Label:
id: label
text: '1'
'''
Builder.load_string(kv)
class NewGameScreen(Screen):
pass
class OptionScreen(Screen):
pass
class TestApp(App):
def build(self):
sm = ScreenManager()
sm.add_widget(NewGameScreen())
sm.add_widget(OptionScreen())
return sm
if __name__ == '__main__':
TestApp().run()
扩展示例（基于滑块值添加按钮）：
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.button import Button
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.properties import ObjectProperty
kv = '''
#:import Label kivy.uix.label.Label
<NewGameScreen>:
name: 'newgame'
slider: slider
BoxLayout:
orientation: 'vertical'
Slider:
id: slider
min: 1
max: 16
step: 1
value: 1
on_value: root.update_buttons()
Button:
text: 'Options'
on_press:
root.manager.transition.direction = 'left'
root.manager.current = 'options'
<OptionScreen>:
layout: layout
name: 'options'
BoxLayout:
Button:
text: 'Go back'
on_press:
root.manager.transition.direction = 'right'
root.manager.current = 'newgame'
BoxLayout:
orientation: 'vertical'
id:layout
Button:
text: "1"
'''
Builder.load_string(kv)
class NewGameScreen(Screen):
slider = ObjectProperty(None)
def update_buttons(self, *args):
layout = self.manager.get_screen('options').layout
layout.clear_widgets()
for i in range(int(self.slider.value)):
layout.add_widget(Button(text=str(i+1)))
class OptionScreen(Screen):
layout = ObjectProperty(None)
class TestApp(App):
def build(self):
sm = ScreenManager()
sm.add_widget(NewGameScreen())
sm.add_widget(OptionScreen())
return sm
if __name__ == '__main__':
TestApp().run()
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