如何在彼此下方各自的标签中打印数据列表

Question

我想在我的应用程序上显示大量数据，但我无法找到以垂直方式打印数据的方法，每个列表元素都位于最后一个下方的标签中。将来我希望将标签替换为MDCard。

此外，如果列表到达屏幕底部，我将如何向下滚动？

*.py

import kivy
from kivy.app import App
from kivy.uix.widget import Widget
from kivy.properties import ObjectProperty
from kivy.properties import StringProperty
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout
from kivy.lang import Builder
from kivymd.app import MDApp
from kivy.uix.screenmanager import ScreenManager, Screen

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

        list1 = ['1','2','3','4','5','6','7','8','9','10','11','12']

        for x in list1:
            self.add_widget(Label(text=x,pos_hint={'center_x':0.5, 'center_y':0.5}))


class WindowManager(ScreenManager):
    pass

kv = Builder.load_file('NearMe.kv')

class NearMeApp(App):
    def build(self):
        return kv

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

*.kv

WindowManager:
    FirstWindow:

<FirstWindow>:
    name:"FirstWindow"
    GridLayout:
        cols:1
        size: root.width, root.height
        GridLayout:
            cols:3
            

Answer 1

您的FirstWindow 的__init__() 方法是将所有Labels 添加到FirstWindow，但它们都在同一位置。我怀疑您实际上想将Labels 添加到最里面的GridLayout。为此，您可以在kv 中将id 添加到GridLayout：

WindowManager:
    FirstWindow:

<FirstWindow>:
    name:"FirstWindow"
    GridLayout:
        cols:1
        size: root.width, root.height
        GridLayout:
            id: grid  # Added id
            cols:3

然后重构您的 FirstWindow 类以使用该 id：

class FirstWindow(Screen):
    def __init__(self, **kwargs):
        super(FirstWindow, self).__init__(**kwargs)
        Clock.schedule_once(self.fill)  # this must be delayed until the `id` is available

    def fill(self, dt):
        grid = self.ids.grid  # get a reference to the GridLayout

        list1 = ['1','2','3','4','5','6','7','8','9','10','11','12']

        for x in list1:
            grid.add_widget(Label(text=x,pos_hint={'center_x':0.5, 'center_y':0.5}))  # add Labels to the GridLayout