我正在尝试创建一个输出随机10x10黑白方块网格的程序。除了左下角有一个不需要的白色方块覆盖网格的一部分外，它主要起作用。

我甚至无法弄清楚导致这个问题的小部件。我试过从root开始打印都无济于事。

import random
import kivy
kivy.require("1.10.1")
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.config import Config
from kivy.graphics import Color
from kivy.graphics import Rectangle

Config.set('graphics', 'width', '400')
Config.set('graphics', 'height', '400')

class Container(FloatLayout):

pass

class ColorLabel(Label):

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

    with self.canvas:
        Color(1, 1, 1, 1)
        self.rect = Rectangle(size=self.size, pos=self.pos)

    self.bind(size=self._update_rect, pos=self._update_rect)

def _update_rect(self, instance, value):
    self.rect.pos = instance.pos
    self.rect.size = instance.size

def changeBG(self):
    with self.canvas.after:
        Color(0,0,0,1)
        self.rect = Rectangle(size=self.size, pos=self.pos)

class Main(App):

def build(self):
    Builder.load_file("EveryImage.kv")
    the_grid = GridLayout(cols=10, spacing=1)

    i = 100
    while i > 0:
        i -= 1
        newLabel = ColorLabel()
        the_grid.add_widget(newLabel)
        x = random.randint(0,1)
        if x == 0:
            newLabel.changeBG()

    root = Container()
    root.add_widget(the_grid)           
    return root

Keep everything below this last!

if name == '__main__':

Main().run()

这是.kv文件：

EveryImage.kv

Container:

Container holds all the other layouts

:

id: contain
canvas.before:
    Color:
        rgba: 0,0,0.5,1 #blue, just for the grid
    Rectangle:
        pos: self.pos
        size: self.size

:

canvas.before:
    Color:
        rgba: 1,1,1,1 #white
    Rectangle:
        pos: self.pos
        size: self.size