在kivymd中更改屏幕之间的过渡

from kivy.uix.screenmanager import ScreenManager, Screen, SlideTransition
from kivymd.app import MDApp

class MyScreenManager(ScreenManager):
    def __init__(self, **kwargs):
        super(MyScreenManager, self).__init__(**kwargs)
        self.transition = SlideTransition()  # 设置过渡效果为滑动

class Screen1(Screen):
    pass

class Screen2(Screen):
    pass

class Screen3(Screen):
    pass

class MyApp(MDApp):
    def build(self):
        sm = MyScreenManager()
        sm.add_widget(Screen1(name='screen1'))
        sm.add_widget(Screen2(name='screen2'))
        sm.add_widget(Screen3(name='screen3'))
        return sm

<MyScreenManager>:
    transition: SlideTransition()

<Screen1>:
    name: 'screen1'
    # 屏幕1的内容

<Screen2>:
    name: 'screen2'
    # 屏幕2的内容

<Screen3>:
    name: 'screen3'
    # 屏幕3的内容