使Kivy TextInput框架不可见，但显示文本

from kivy.app import App
from kivy.uix.textinput import TextInput
from kivy.core.window import Window

class InvisibleTextInput(TextInput):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.background_color = (0, 0, 0, 0)  # 设置背景颜色为完全透明
        self.foreground_color = (0, 0, 0, 0)  # 设置前景颜色为完全透明

class MyApp(App):
    def build(self):
        Window.clearcolor = (1, 1, 1, 1)  # 设置窗口背景颜色为白色
        return InvisibleTextInput()

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