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在ScreenManager Kivy中向屏幕动态添加按钮时出错

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我正在尝试动态添加按钮到屏幕 . 运行应用程序时出现以下错误 . 请帮我解决这个问题 .

回溯(最近一次调用最后一次):文件“main.py”,第174行,在screenManager.add_widget(HomeScreen(name ='homeScreen'))文件“main.py”,第162行,在init self.add_widget(btn) )文件“/Applications/Kivy.app/Contents/Resources/kivy/kivy/uix/floatlayout.py”,第111行,在add_widget中pos = self._trigger_layout,AttributeError:'HomeScreen'对象没有属性'_trigger_layout'

这是我的main.py

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

1 回答

  • 0

    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你创建一个实例时被调用,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,因此能够实际继承行为 .

    请注意, Screen 本身是RelativeLayout,您使用的布局可以为您执行此操作 .

    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)
    

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