Python|使用 .kv 文件创建复选框

Kivy 是Python中一个独立于平台的 GUI 工具。因为它可以在Android、IOS、Linux、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.

复选框小部件：
CheckBox 是一个特定的两种状态按钮，可以选中或取消选中。
要使用复选框，您首先必须从包含复选框的所有特性和功能的模块中导入复选框，即

from kivy.uix.checkbox import CheckBox 

Basic Approach to follow while creating Checkbox using .kv file :
1) import kivy
2) import kivyApp
3) import BoxLayout
4) import Checkbox
5) set minimum version(optional)
6) Extend the container class
7) set up .kv file :
9) Return layout
10) Run an instance of the class

现在是如何使用 .kv 文件在 Kivy 中创建复选框的程序：

Python3

# main.py file
# program for creating checkbox using .kv in kivy.
 
# import kivy module
import kivy
 
# set require version
kivy.require("1.9.0")
  
# base Class of your App inherits from the App class. 
# app:always refers to the instance of your application 
from kivy.app import App
 
from kivy.uix.boxlayout import BoxLayout
 
## not necessary while using .kv file
from kivy.uix.checkbox import CheckBox
 
# To do some manipulation on window import window
from kivy.core.window import Window
 
# Container class for the app's widgets
class SampBoxLayout(BoxLayout):
 
    # Callback for the checkbox
    def checkbox_click(self, instance, value):
        if value is True:
            print("Checkbox Checked")
        else:
            print("Checkbox Unchecked")
 
 
# App derived from App class
class SampleApp(App):
    # build is a method of Kivy's App class used
    # to place widgets onto the GUI.
    def build(self):
        # setting up window background color
        Window.clearcolor = (0, 0, .30, .60)
        return SampBoxLayout()
 
# Run the app
root = SampleApp()
root.run()

代码的 sample.kv 文件。

Python3

#.kv file of main.py file
 
#: import CheckBox kivy.uix.checkbox
 
# giving colour to label
:
    color: .761, .190, .810, 1
 
:
    orientation: "vertical"
    padding: 10
    spacing: 10
  
    CustLabel:
        text: "Gender"
        size_hint_x: 1
        font_size:20
 
    # creating box layout
    BoxLayout:
        # assigning orientation
        orientation: "horizontal"
        height: 20
 
        BoxLayout:
            orientation: "horizontal"
            size_hint_x: .22
 
            # label creation
            CustLabel:
                text: "Male"
                size_hint_x: .80
                font_size:30
            CheckBox:
                color:.294, .761, .623
                on_active: root.checkbox_click(self, self.active)
                size_hint_x: .20
 
            CustLabel:
                text: "Female"
                size_hint_x: .80
                font_size:20
            CheckBox:
                on_active: root.checkbox_click(self, self.active)
                size_hint_x: .20
 
            CustLabel:
                text: "Other"
                size_hint_x: .80
                font_size:10
            CheckBox:
                on_active: root.checkbox_click(self, self.active)
                size_hint_x: .20

输出：

视频输出：