如何获得 Kivy id

Question

我刚开始学习 kivy，我尝试创建 2 个屏幕的应用程序

现在我有 AttributeError:

box = self.ids.box 文件“kivy/properties.pyx”，第 864 行，在 kivy.properties.ObservableDict.getattr AttributeError：“超级”对象没有属性“getattr”

我的 .kv 文件

WindowManager:
    FirstWindow:
    SecondWindow:


<FirstWindow>:
    name: "first"

    MDRoundFlatButton:
            text: "LOG IN"
            font_size: 12
            pos_hint: {"center_x": 0.5}
            on_release:
                app.root.current = "second"
                
                root.manager.transition.direction = "left"


<SecondWindow>:
    name: "second"
    BoxLayout:
        orientation: "vertical"
        size: root.width, root.height
        GridLayout:
            cols: 2
            GridLayout:
                cols: 2

                Label:
                    text: "Watchlist Screen"
                    font_size: 32

                BoxLayout:
                    id: box
                    size_hint_y: .8
                    pos_hint: {"top":1}

id box应该怎么称呼

lass AwesomeApp(MDApp):
    def __init__(self, **kwargs):

        super().__init__(**kwargs)

    def build(self):
        return Builder.load_file('login.kv')

class FirstWindow(Screen):
    pass

class SecondWindow(Screen):

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

        x = [1, 2, 3, 4, 5]
        y = [5, 12, 6, 9, 15]

        plt.plot(x, y)
        plt.ylabel("This is MY Y Axis")
        plt.xlabel("X Axis")
        
        
        box = self.ids.box
        box.add_widget(FigureCanvasKivyAgg(plt.gcf()))


class WindowManager(ScreenManager):
    pass

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

有没有关于 Kivy 的好书？

Answer 1

你可以通过

获取id

self.ids.<your_id>