如何在另一个屏幕上制作 MDDataTable？

Question

按下按钮后，我找不到将 MDDataTable 放入第二个屏幕的方法。当我从第一个屏幕按下按钮时，我希望能够在第二个屏幕中显示我的表格。我不知道要写什么才能让 view_account 函数在我的帐户屏幕中运行。桌子似乎无法进入第二个屏幕。 我得到的错误是这样的

self.table.open()
 AttributeError: 'DemoApp' object has no attribute 'table'

Window.size = (300, 500)

screen_helper = """
ScreenManager:
    MenuScreen:
    AccountScreen:
<MenuScreen>:
    name: 'menu'
    MDLabel:
        text: "Login Page Test"
        pos_hint: {'center_x':0.8, 'center_y':0.9}
    MDRectangleFlatButton:
        text: 'Proceed To Next Page'
        pos_hint: {'center_x':0.5, 'center_y':0.4}
        font_size : 20
        on_press:
            root.manager.current = 'account'   
            app.view_account()
<AccountScreen>:
    name: 'account'
    MDLabel:
        text: 'Accounts Page Test'
        halign: 'center'
    
"""


class MenuScreen(Screen):
    pass

class AccountScreen(Screen):
    pass

sm = ScreenManager()
sm.add_widget(MenuScreen(name='menu'))
sm.add_widget(AccountScreen(name='account'))


class DemoApp(MDApp):

    def build(self):

        screen = Builder.load_string(screen_helper)
        return screen

    def view_account(self):
        rows = []
        table = MDDataTable(pos_hint={'center_x': .5, 'center_y': .6},
                            size_hint=(.9, 0.7),
                            check=True,
                            rows_num=30,
                            column_data=[
                                ("Type.", dp(38)),
                                ("Balance", dp(20)),
                                ("Date", dp(20)),
                                ("id", dp(20))
                            ],
                            row_data=rows
                            )
        table.bind(on_check_press=self.check_press)
        table.bind(on_row_press=self.row_press)
        close_button1 = MDFlatButton(text='Close', on_release=self.close_view)
        self.table.open()

    def row_press(self, instance_table, instance_row):
        print(instance_table, instance_row)


DemoApp().run()

Answer 1

不要在应用程序中执行此操作，而是在具有按钮的屏幕中创建一个功能，然后访问另一个屏幕，然后添加到它。

Kivy修改（添加方法并为表格创建一个容器/容器）

     MDRectangleFlatButton:
        text: 'Proceed To Next Page'
        pos_hint: {'center_x':0.5, 'center_y':0.4}
        font_size : 20
        on_press:
<AccountScreen>:
    name: 'account'
    FloatLayout:
        MDLabel:
            text: 'Accounts Page Test'
            halign: 'center'
                root.manager.current = 'account'   
                root.add_table()
        BoxLayout:
            id: table_holder

Python修改（在MenuScreen中创建方法）

class MenuScreen(Screen):
    
    def add_table(self):
        account_screen_ref = self.manager.get_screen('account')
        account_screen_ref.ids['table_holder'].add_widget(account_screen_ref.table)


class AccountScreen(Screen):
    def on_kv_post(self):
        rows = []
        self.table = MDDataTable(pos_hint={'center_x': .5, 'center_y': .6},
                            size_hint=(.9, 0.7),
                            check=True,
                            rows_num=30,
                            column_data=[
                                ("Type.", dp(38)),
                                ("Balance", dp(20)),
                                ("Date", dp(20)),
                                ("id", dp(20))
                            ],
                            row_data=rows
                            )
        self.table.bind(on_check_press=self.check_press)
        self.table.bind(on_row_press=self.row_press)
        close_button1 = MDFlatButton(text='Close', on_release=self.close_view)