我试图让屏幕管理器首先打开不同的屏幕，这取决于可变的时间Kivy。

Question

有没有办法改变你的屏幕管理器从基维开始的屏幕。我的屏幕管理器位于kivy语言的kivy文件上，但我的App类显然在python中，这就是我将函数放在屏幕管理器应该从哪个屏幕开始的地方。

它应该看起来有点像这样：

kvfile.kv

<Screenmanager>
     Screen1:
          name: 'screen_1'
     Screen2:
          name: 'screen_2'

pythonfile.py

import "libraries"

class Screen1(Screen):
       pass

class Screen2(Screen):
       pass

class Screenmanager(ScreenManager):
       pass

class MyApp(self, App):
       def Build(self):
           if "I already have this code":
                  self.idk.idk.current = 'screen_1' <---- Here is where I need help
                  return Screenmanager
           else:
               self.idk.idk.current = 'screen_2' <------ And here obviously
               return Screenmanager

Answer 1

在返回current之前，只需设置ScreenManager屏幕即可。类似于：

class MyApp(self, App):
    def Build(self):
        Builder.load_file("kvfile.kv")
        sm = ScreenManager()
        sm.transition = NoTransition()
        if something:
            sm.current = "screen_1"
        else:
            sm.current = "screen_2"
        return sm