Python|使用 .kv 文件的 kivy 中的进度条小部件

Kivy 是Python中一个独立于平台的 GUI 工具。因为它可以在Android、IOS、linux和Windows等平台上运行。它基本上是用来开发Android应用程序的，但这并不意味着它不能在桌面应用程序上使用。

👉🏽 Kivy Tutorial – Learn Kivy with Examples.

编程需要懂一点英语

进度条小部件：

ProgressBar 小部件用于可视化某些任务的进度。当前仅支持水平模式：垂直模式尚不可用。进度条没有交互元素，是一个仅显示的小部件。

To work with the progressbar widget you must have to import it by the command:

from kivy.uix.progressbar import ProgressBar

编程需要懂一点英语

进度条需要两个参数：
1) max：value 允许的最大值。它是一个 Numeric 属性，默认为 100。
2) value：滑块的当前值

Basic Approach:

1) import kivy
2) import kivyApp
3) import progressbar
4) import Boxlayout(according to need)
5) Set minimum version(optional)
6) Create Layout class:
7) Create App class
8) Create .kv file:
         1) Add progress bar
         2) Add label
         3) Add canvas if you want as i did
8) return Layout/widget/Class(according to requirement)
9) Run an instance of the class

方法的实施：

.py 文件

# Program to Show how to create a Progressbar in .kv file
  
# import kivy module    
import kivy  
       
# base Class of your App inherits from the App class.    
# app:always refers to the instance of your application   
from kivy.app import App 
     
# this restrict the kivy version i.e  
# below this kivy version you cannot  
# use the app or software  
kivy.require('1.9.0') 
    
# The Label widget is for rendering text.  
from kivy.uix.label import Label 
    
# The ProgressBar widget is used to
# visualize the progress of some task
from kivy.uix.progressbar import ProgressBar 
  
# BoxLayout arranges children in a vertical or horizontal box. 
# or help to put the children at the desired location. 
from kivy.uix.boxlayout import BoxLayout
  
  
# The class whose internal work is in  kv file
class ProgBar(BoxLayout):
    pass
  
# Create the App Class   
class mainApp(App):
    def build(self):
        return ProgBar()
  
# Create the run
if __name__=='__main__':
    mainApp().run()

.kv 文件

# .kv file
  
# Extension of ProgBar class in .kv file
:
  
    orientation: 'vertical'
    # Creating the background of the App
    canvas:
        Color:
            rgb: .45, .28, .5
        Rectangle:
            pos: self.pos
            size: self.size
  
    # Providing label to the pg bar
    Label:
        text: '[size = 40px]Progress Bar 1 (at .25)'
        color: .5, 0, .5, 1
        markup: True
  
    # Creating thepg bar of specific value
    ProgressBar:
        value: .25
        min: 0
        max: 1
        pos_hint: {'x':.1}
        size_hint_x: .8
  
    # Providing label to the pg bar
    Label:
        text: '[size = 40px]Progress Bar 2 (at .55)'
        color: .5, 0, .5, 1
        markup: True
  
    # Creating thepg bar of specific value
    ProgressBar:
        value: .55
        min: 0
        max: 1
        pos_hint: {'x':.1}
        size_hint_x: .8

输出：

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