更改 Kivy 中按钮的大小和位置

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，我们将看到如何在 kivy Python中更改按钮的大小和位置。有 4 个属性需要设置，按钮的大小和位置。有 2 个属性用于静态放置，另外 2 个用于动态放置。

size : It takes two arguments i.e. (width, height).

Python3

button = Button(
    text ='Hello world',
    size_hint =(.5, .25),
    pos =(20, 20))

Python3

button = Button(text ='Hello world', size_hint =(.6, .6),
                pos_hint ={'x':.2, 'y':.2})

Python3

## Sample Python application demonstrating the
## How to change button position and size in Kivy.
###################################################
# import modules
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
 
# creates the button in kivy
# if not imported shows the error
from kivy.uix.button import Button
 
# This layout allows you to set relative coordinates for children.
from kivy.uix.relativelayout import RelativeLayout
 
# 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 App class
class Pos_Size_App(App):
     
    def build(self):
 
        # A Relative Layout with a size of (300, 300) is created
        rl = RelativeLayout(size =(300, 300))
         
        # creating button
        # size of button is 20 % by height and width of layout
        # position is 'center_x':.7, 'center_y':.5
        b1 = Button(size_hint =(.2, .2),
                    pos_hint ={'center_x':.7, 'center_y':.5},
                    text ="pos_hint")
 
        # creating button
        # size of button is 20 % by height and 50 % width of layout
        b2 = Button(size_hint =(.5, .2), 
                    text ="size_hint")
 
                # creating button
        # size of button is 20 % by height and width of layout
        # position is 200, 200 from bottom left
        b3 = Button( size_hint =(.2, .2),
                    pos =(200, 200),
                    text ="pos")
         
         
 
        # adding button to widget
        rl.add_widget(b1)
        rl.add_widget(b2)
        rl.add_widget(b3)
     
         
        # returning widget
        return rl
 
# run the App
if __name__ == "__main__":
    Pos_Size_App().run()

pos : pos stands for position i.e it is used to position the widget. By default (0, 0), the bottom-left corner of the screen is the default position of the button in kivy python.

Python3

b1 = Button(pos =(100, 100))
b2 = Button(pos =(200, 200))

size_hint : Provide hint of size. It contains two arguments i.e. width and height it can be floating values. By default, all widgets have their size_hint=(1, 1). To create a button 50% of the width and 25% of the height of the layout and positioned at (20, 20), you can do –

Python3

button = Button(
    text ='Hello world',
    size_hint =(.5, .25),
    pos =(20, 20))

pos_hint : Provide hint of position. We can define upto 8 keys i.e. it takes arguments in form of dictionary.

pos_hint = {“x”:1, “y”:1, “left”:1, “right”:1, "center_x":1,
                "center_y":1, "top”:1, “bottom”:1("top":0)}

If you want to create a button that will always be the size of layout minus 20% on each side –

Python3

button = Button(text ='Hello world', size_hint =(.6, .6),
                pos_hint ={'x':.2, 'y':.2})

编程需要懂一点英语

Kivy Tutorial – Learn Kivy with Examples.

编程需要懂一点英语

笔记：

size_hint 和 pos_hint 只能使用 0-1 之间的值。其中 0 = 0% 和 1 = 100%。
kivy 中的坐标系从左下角开始工作！这在放置我们的对象时很重要。（即 (0, 0) 是左下角）。

b1 = Button(size =(100, 100))
b2 = Button(size =(200, 200))

以下是所有 4 个属性的实现：

Python3

b1 = Button(pos =(100, 100))
b2 = Button(pos =(200, 200))

输出：