在ScreenManager Kivy中将按钮动态添加到屏幕时出错

Question

我正在尝试添加按钮动态屏幕。我运行应用程序时出现以下错误。请帮我解决这个问题。你知道吗

Traceback (most recent call last): File "main.py", line 174, in screenManager.add_widget( HomeScreen( name = 'homeScreen' ) ) File "main.py", line 162, in init self.add_widget(btn) File "/Applications/Kivy.app/Contents/Resources/kivy/kivy/uix/floatlayout.py", line 111, in add_widget pos=self._trigger_layout, AttributeError: 'HomeScreen' object has no attribute '_trigger_layout'

这是我的主.py你知道吗

class HomeScreen(Screen):

    def __init__(self, **kwargs):
        for i in range(80):
            btn = Button(text=str(i), size=(90, 90), size_hint=(None, None))
            self.add_widget(btn)


# Screen Manager
screenManager = ScreenManager( transition = FadeTransition() )

# Add all screens to screen manager
#screenManager.add_widget( UsernameScreen( name = 'usernameScreen' ) )
#screenManager.add_widget( PasswordScreen( name = 'passwordScreen' ) )
#screenManager.add_widget( LevelTwoScreen( name = 'levelTwoScreen' ) )
#screenManager.add_widget( LevelTwoScreen( name = 'levelThreeScreen' ) )

screenManager.add_widget( HomeScreen( name = 'homeScreen' ) )

class ThreeLevelAuthApp(App):
    def build(self):
        return screenManager

if __name__ == '__main__':
    ThreeLevelAuthApp().run()

kivy文件

<HomeScreen>:
    ScrollView:
        size_hint: None, None
        size: 400, 400
        pos_hint: { 'center_x': 0.5,'center_y': 0.5 }   
        do_scroll_x: False

    GridLayout:
        cols: 6
        padding: 20
        spacing: 20
        size_hint: None, None
        width: 400

Answer 1

让我们从__init__开始：

class HomeScreen(Screen):

    def __init__(self, **kwargs):
        for i in range(80):
            btn = Button(text=str(i), size=(90, 90), size_hint=(None, None))
            self.add_widget(btn)

虽然这看起来很好，并且在创建实例时调用，但是缺少一个基本的东西super()。首先需要super()来初始化Screen，这样它就拥有了所有必需的变量和方法，使它成为具有真实行为的类，从而使您能够真正继承行为。你知道吗

请注意，Screen本身是一个^{}，如果您不使用这样做的布局，您将需要处理诸如定位和/或大小调整之类的附加内容。你知道吗

import random
class HomeScreen(Screen):

    def __init__(self, **kwargs):
        super(HomeScreen, self).__init__(**kwargs)
        for i in range(80):
            btn = Button(text=str(i), size=(90, 90),
                         size_hint=(None, None),
                         pos=[random.randint(0,500), random.randint(0,500)])
            self.add_widget(btn)