Font Size

Date: February 24th 2016
Last updated: February 24th 2016

The default font size is 12 pixels. You can change the font size by specifying it directly using sp (A). Or you can add a root-level button size that can be called by any element (B).

main.py

import kivy
kivy.require('1.9.0')

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout

class Sample(BoxLayout):
    pass

class SampleApp(App):
    def build(self):
        # return the boxlayout class defined above
        return Sample()

if __name__ == '__main__':
    SampleApp().run()

sample.kv

#:kivy 1.9.0
<Sample>:
    orientation: 'vertical'
    button_font_size: '30sp' #<======= (B) root-level attribute
    Label:
        text: 'Guess N sampling game!'
        size_hint: 1, None
        height: self.texture_size[1]
        font_size: '45sp'  #<========= (A) direct assignment
    Label:
        text: 'Game info to go here...'
        size_hint: 1, 1
    TextInput:
        text: 'Guess N...'
    BoxLayout:
        orientation: 'horizontal'
        size_hint: 1, None
        Button:
            text: 'Clear'
            size_hint: None, None
            font_size: root.button_font_size #<=== (B) 
        Button:
            text: 'Guess!'
            size_hint: 1, None
            font_size: root.button_font_size #<=== (B)
        Button:
            text: 'Quit'
            size_hint: None, None
            font_size: root.button_font_size #<=== (B)

Output
Note that I have changed the boxlayout from previous examples.