Mode:.kv

It's very simple, say_hello belongs to the Launch class so in order to use it in your .kv file you have to write root.say_hello. Note that say_hello is a function that you want to execute so you don't have to forget the () ---> root.say_hello().

另外，如果 say_hello 在 App 类中，您应该使用 App.say_hello() 因为它属于应用程序.(注意:即使你的 App 类是 class MyFantasicApp(App): 它总是 App.say_hello() 或 app.say_hello() 我不记得了，抱歉).

Also, if say_hello were in App class you should use App.say_hello() because it belongs to the app. (Note: even if your App class were class MyFantasicApp(App): it would always be App.say_hello() or app.say_hello() I don't remember, sorry).

#:kivy 1.9.1

<Launch>:
    BoxLayout:
        Button:
            size:(80,80)
            size_hint:(None,None)
            text:"Click me"
            on_press: root.say_hello()

模式:.py

你可以绑定函数.

from kivy.uix.button import Button # You would need futhermore this
class Launch(BoxLayout):
    def __init__(self, **kwargs):
        super(Launch, self).__init__(**kwargs)
        mybutton = Button(
                            text = 'Click me',
                            size = (80,80),
                            size_hint = (None,None)
                          )
        mybutton.bind(on_press = self.say_hello) # Note: here say_hello doesn't have brackets.
        Launch.add_widget(mybutton)

    def say_hello(self):
        print "hello"

为什么要使用 bind?对不起，不知道.但是您在 kivy 指南中使用了它.

Why use bind? Sorry, no idea. But you it's used in the kivy guide.

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