Kivy-获得黑屏

Question

Why am i getting a black screen? The Code worked fine 10 minutes ago. What's wrong with the Code, i cannot see anything wrong! Also i cannot find any solution for that online! Do you guys know how to fix the Problem?

#!/usr/bin/env python

import kivy

kivy.require("1.10.0")

import os
import humanize
from glob import glob
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout

class Layout(GridLayout):
    def __init__(self,**kwargs):
        super(Layout,self).__init__(**kwargs)
        self.cols = 1

     def scan(self):
        pass          
        scanb = Button(text="Scan",background_color=(1,0,1,1),font_size=(50))
        title = Label(text="StorageCleaner",font_size=(50),size_hint=(.1,.2),background_color=(1,0,0,1))

        self.add_widget(title)
        self.add_widget(copy)
        scanb.bind(on_press=scan)

class StorageCleaner(App):
    def build(self):
        layout = Layout()
        return layout

sc = StorageCleaner()

if __name__ == "__main__":
       sc.run()

Answer 1

Might be the indentation after 'pass' in your scan function. Looks like 'scanb', 'title', etc, is indented one level too much

Answer 2

You have a few errors. Please refer to the example below for details.

Example

main.py

import kivy
kivy.require("1.10.0")

import os
import humanize
from glob import glob
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.button import Button
from kivy.uix.gridlayout import GridLayout


class Layout(GridLayout):

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

        self.cols = 1

        scanb = Button(text="Scan", font_size=50)
        scanb.bind(on_press=self.scan)
        title = Label(text="StorageCleaner", font_size=50, size_hint=(.1, .2))

        self.add_widget(title)
        self.add_widget(scanb)

    def scan(self):
        pass


class StorageCleaner(App):

    def build(self):
        return Layout()


if __name__ == "__main__":
    StorageCleaner().run()

Output