kivy中带有验证按钮的文本输入框（使用.kv文件）

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。
在本文中，我们将学习如何使用Python中的 .kv 文件在 kivy 中添加带有文本输入的按钮，就像我们在输入和提交按钮中一样。因此，要做到这一点，您首先必须了解 kivy 中的 Textinput 小部件和 Button。

TextInput: The TextInput widget provides a box for editable plain text. Unicode, multiline, cursor navigation, selection and clipboard features are supported.
Button: The Button is a Label with associated actions that are triggered when the button is pressed (or released after a click/touch). We can add functions behind the button and style the button.

Basic Approach -

1) import kivy
2) import kivyApp
3) import widget
4) import Boxlayout
5) import textinput and Button
6) Set minimum version(optional)
7) Create Widget class
8) Create App class
9) create .kv file (name same as the app class):
        1) create textinput
        2) create Button
10) return Layout/widget/Class(according to requirement)
11) Run an instance of the class

Kivy Tutorial – Learn Kivy with Examples.

方法的实施
main.py 文件

Python3

# Program to Show how to create textinput 
# with button in kivy using .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('1.9.1')
   
# Widgets are elements
# of a graphical user interface
# that form part of the User Experience.
from kivy.uix.widget import Widget
   
# The TextInput widget provides a
# box for editable plain text
from kivy.uix.textinput import TextInput
   
# BoxLayout arranges widgets in either
# in a vertical fashion that is
# one on top of another or in a horizontal
# fashion that is one after another.  
from kivy.uix.boxlayout import BoxLayout
 
# to change the kivy default settings we use this module config
from kivy.config import Config
    
# 0 being off 1 being on as in true / false
# you can use 0 or 1 && True or False
Config.set('graphics', 'resizable', True)
 
# creating the root widget used in .kv file
class BtnTextInput(BoxLayout):
    pass
 
# class in which we are creating the Textinput and btn
# in .kv file to be named main.kv
class MainApp(App):
    # defining build()
    def build(self):
        # returning the instance of root class
        return BtnTextInput()
 
# run function runs the whole program
# i.e run() method which calls the target
# function passed to the constructor.
if __name__ == '__main__':
    MainApp().run()

.kv 文件实现

Python3

## .kv file implementation of the App class
 
 
# Creating the root widget
:
 
    # To position widgetsin the proper orientation 
    # use of vertical orientation to set all widgets
    orientation: "vertical"
 
    # Using the Box layout
    BoxLayout:
        height: "50dp"
        size_hint_y: None
 
        # Creating Test input
        TextInput:
            size_hint_x: 20
 
        # Creating Button
        Button:
            text: "Apply"
            size_hint_x: 25
            background_color: 0, 0, 1, 1
            font_size: 35

输出：
按钮被按下

未按下按钮

简单视图（关闭）