在 Kivy 中更改按钮颜色

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Desktops应用程序上使用。

在本文中，我们将学习如何在 kivy 中更改按钮颜色。有一个名为background_color的属性，用于更改 kivy Python中按钮的颜色。

background_color – The background-color kivy property sets the background color of an element. It is specified as a single color value.

Syntax: background_color: 1, 0, 0, 1

编程需要懂一点英语

注意：默认情况下，按钮的颜色是黑色（小灰色），如果你想改变它，那么我们使用这个属性。它只取 0 到 1 之间的值，任何其他值都会导致程序的错误行为。

Basic Approach to follow while changing button color:
1) import kivy
2) import kivyApp
3) import all needed
4) set minimum version(optional)
5) Add widgets
6) Add buttons at set their colors
6) Extend the class
7) Return layout
8) Run an instance of the class

编程需要懂一点英语

Kivy Tutorial – Learn Kivy with Examples.

编程需要懂一点英语

现在下面是如何更改按钮颜色的代码：

代码1#

def build(self): 
        # use a (r, g, b, a) tuple 
        btn = Button(text ="Push Me !", 
        font_size ="20sp", 
  
                # Here you can give the color
                # The value must be between 0 to 1 
                # greyish black color
                background_color =(1, 1, 1, 1),  
  
                size =(32, 32), 
                size_hint =(.2, .2), 
                pos =(300, 250)) 
  
        return btn

代码 #2

## Sample Python application demonstrating the 
## How to change button color in Kivy.
################################################### 
   
# import kivy module 
import kivy 
  
# to choose the colors randomly 
# every time you run it shows different color 
import random 
  
# this restricts the kivy version i.e 
# below this kivy version you cannot 
# use the app or software 
kivy.require("1.9.1") 
      
# base Class of your App inherits from the App class. 
# app:always refers to the instance of your application 
from kivy.app import App 
      
# creates the button in kivy 
# if not imported shows the error 
from kivy.uix.button import Button 
  
# 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 
  
# declaring the colours you can use directly also 
red = [1, 0, 0, 1] 
green = [0, 1, 0, 1] 
blue = [0, 0, 1, 1] 
purple = [1, 0, 1, 1] 
      
# class in which we are creating the button 
class ChangeColorApp(App): 
          
    def build(self): 
        superBox = BoxLayout(orientation ='vertical') 
  
        HB = BoxLayout(orientation ='horizontal') 
  
        # creating the list of defined colors
        colors = [red, green, blue, purple] 
          
  
        # Changing the color of buttons
        # here you can see how you can change the color
        btn1 = Button(text ="One",
                    # Color of button is changed not default
                    background_color = random.choice(colors), 
                    font_size = 32, 
                    size_hint =(0.7, 1)) 
  
        btn2 = Button(text ="Two", 
                    background_color = random.choice(colors), 
                    font_size = 32, 
                    size_hint =(0.7, 1)) 
  
        HB.add_widget(btn1) 
        HB.add_widget(btn2) 
  
   
        VB = BoxLayout(orientation ='vertical') 
  
        btn3 = Button(text ="Three", 
                    background_color = random.choice(colors), 
                    font_size = 32, 
                    size_hint =(1, 10)) 
  
        btn4 = Button(text ="Four", 
                    background_color = random.choice(colors), 
                    font_size = 32, 
                    size_hint =(1, 15)) 
  
          
        VB.add_widget(btn3) 
        VB.add_widget(btn4) 
  
        superBox.add_widget(HB) 
        superBox.add_widget(VB) 
  
        return superBox 
  
# creating the object root for App class 
root = ChangeColorApp() 
      
# run function runs the whole program 
# i.e run() method which calls the 
# target function passed to the constructor. 
root.run()

输出：

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