Python（kivy）中的 ScreenManager 和 Screen 問題。 我想從 Screenmanager class 在 Screen 中調用 def

Question

我正在嘗試從 class Screenmanager 的 Screenmanager 調用 class 屏幕中的 def，但我不能。

我想在調用 ScreenManager 后立即啟動應用程序時制作一個框布局並在該框布局中放置一個按鈕，因此它是默認屏幕。 我想這樣做，這樣我就可以在按下按鈕時使用 self.parent.current = 'Screen Name' 在多個屏幕之間切換

這是代碼

class Manager(ScreenManager):
    def __init__(self):
        self.add_widget(Scr1().make_button())
class Scr1(Screen):
    def __init__(self):
        self.layout = BoxLayout(orientation = 'vertical')
        self.button = Button(text='hello')
        self.layout.add_widget(self.button)
    def make_button(self, layout):
        return self.layout



class MainApp(App):
    def build(self):
        sm =Manager()
        s1 = Scr1()
        sm.add_widget=s1
        return sm

if __name__ == "__main__":
    MainApp().run()

這是我得到的錯誤

 Traceback (most recent call last):
   File "C:/Users/user/Desktop/CarsonMusic/Learn.py", line 43, in <module>
     MainApp().run()
   File "C:\Users\user\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\app.py", line 829, in run
     root = self.build()
   File "C:/Users/user/Desktop/CarsonMusic/Learn.py", line 37, in build
     sm =Manager()
   File "C:/Users/user/Desktop/CarsonMusic/Learn.py", line 24, in __init__
     self.add_widget(Scr1().make_button())
   File "C:\Users\user\AppData\Local\Programs\Python\Python37-32\lib\site-packages\kivy\uix\screenmanager.py", line 979, in add_widget
     'ScreenManager accepts only Screen widget.')
 kivy.uix.screenmanager.ScreenManagerException: ScreenManager accepts only Screen widget.

我知道我可能犯了一個愚蠢的錯誤，但有人可以幫助我嗎？

Answer 1

我解決了，我必須刪除 Manager(ScreenManager) class，添加“超級”，然后將布局小部件添加到 self

這是我的新代碼：

class Scr1(Screen):
    def __init__(self, **kwargs):
        super (Scr1, self).__init__(**kwargs)

        self.layout = BoxLayout(orientation='vertical')
        self.button = Button(text='hello')
        self.button.bind(on_press=self.screen2)
        self.layout.add_widget(self.button)
        self.add_widget(self.layout)

    def screen2(self, *args):
        self.manager.current = 'screen2'

class Scr2(Screen):

    def __init__(self, **kwargs):
        super (Scr2,self).__init__(**kwargs)

        self.layout2 = BoxLayout(orientation='vertical')
        self.add_widget(self.layout2)
        self.button2 = Button(text='hello2')
        self.button2.bind(on_press=self.screen1)
        self.layout2.add_widget(self.button2)
    def screen1(self, *args):
        self.manager.current = 'screen1'

class MainApp(App):
    def build(self):
        sm= ScreenManager()
        screen1 = Scr1(name='screen1')
        screen2= Scr2(name='screen2')
        sm.add_widget(screen1)
        sm.add_widget(screen2)
        return sm

if __name__ == "__main__":
    MainApp().run()