Kivy：在网格中分配动作/分类按钮答案

【问题标题】：Kivy: assigning actions/classifying buttons in gridKivy：在网格中分配动作/分类按钮
【发布时间】：2017-10-29 01:07:19
【问题描述】：

我在将操作分配给我在 kivy 中的网格中放置的按钮时遇到问题。任何帮助将不胜感激。

我对所有编码都是新手，但我一直在努力解决这个问题。我试图为按钮分配一个名称，但它不起作用，因为“on_press”函数不适用于字符串，只能用于按钮。有什么方法可以将网格中的字符串分类为按钮，还是我做错了一切？我希望每个按钮都执行不同的操作，因此它们不能被归类为同一事物。

这是我的代码：

    import kivy 
kivy.require('1.10.0') 
from kivy.uix.gridlayout import GridLayout 
from kivy.app import App 
from kivy.core.window import Window 
from kivy.uix.button import Button


    class MyApp(App):

        def build(self):
            def callback(instance):
                print('The button 1 is being pressed' % instance.text)

            # test 1: I dont think this works because it doesn't work with the grid structure but I tried it anyways
    # btn1 = Button(background_color=blue, text='a', size_hint_x=None, width=butw)

    # test 2: I don't think it works because it is not classified as a button, but a string.
    # btn1 = "layout.add_widget(Button(background_color=blue, text='a', size_hint_x=None, width=butw))"

            btn1.bind(on_press=callback)

            layout = GridLayout(cols=1, rows=28, row_force_default=True, row_default_height=buth)
            layout.add_widget(Button(background_color=blue, text='a', size_hint_x=None, width=butw))
            layout.add_widget(Button(background_color=blue2, text='b', size_hint_x=None, width=butw))
            layout.add_widget(Button(background_color=blue, text='c',  size_hint_x=None, width=butw))
    # cont.
            return layout

    MyApp().run()

谢谢，瑞恩

【问题讨论】：

标签： python user-interface button kivy grid-layout

【解决方案1】：

所以，在第 12 行，print('The button 1 is being pressed' % instance.text)，您尝试格式化字符串，但您没有指定将实例文本放在何处。否则，我编辑的这段代码（请下次从示例中删除所有不需要的代码）工作正常，当按下“a”按钮时它会打印：

import kivy 
kivy.require('1.10.0') 
from kivy.uix.gridlayout import GridLayout 
from kivy.app import App 
from kivy.uix.button import Button


class MyApp(App):

    def build(self):
        def callback(instance):
            print('The button 1 is being pressed',  instance.text)

        # test 1: I dont think this works because it doesn't work with the grid structure but I tried it anyways
        btn1 = Button(text='a', size_hint_x=None, width=30)

        btn1.bind(on_press=callback)

        layout = GridLayout(cols=1, rows=28)
        layout.add_widget(btn1)
        layout.add_widget(Button(text='b', size_hint_x=None, width=30))
        layout.add_widget(Button(text='c',  size_hint_x=None, width=30))

        return layout

MyApp().run()

对具有其他功能的其他按钮执行相同操作，就完成了。

【讨论】：