Kivy >> On Press 方法触发了两次

Question

由于某种原因，Word_button 实例的 On Press 事件被触发了两次。下面的代码演示了这一点。

重复问题。

• 运行下面的代码
• 单击“创建单词列表”按钮。这将创建一个按钮列表。如果单词正确与否，每个按钮都有布尔属性。
• 然后单击单词按钮。单击按钮时，打印语句会打印正确的布尔变量和按钮文本。

问题：

• 打印命令运行两次。

from kivy.lang.builder import Builder
from kivy.uix.screenmanager import Screen
from kivy.properties import (NumericProperty, BooleanProperty)
from kivymd.app import MDApp
from kivymd.uix.button import MDRaisedButton
from kivymd.uix.boxlayout import MDBoxLayout

kv = '''
<Word_button@MDRaisedButton>:
    pos_hint: {'center_x': .5}
    size_hint: 1, 1
    font_size: "16sp"
    on_press: self.check_word()

<Words_Box@MDBoxLayout>:
    pos_hint: {'center_x': .5}
    size_hint: 1, 1

Screen:
    id: spelling_screen
    name: "spelling_screen"
    MDBoxLayout:
        orientation: 'vertical'
        padding: dp(15)
        spacing: dp(10)
        MDLabel:
            text: 'Words'
        Words_Box:
            id: words_box
            orientation: 'vertical'
            padding: dp(15)
            spacing: dp(10)
        MDRaisedButton:
            text: 'CREATE LIST OF WORDS'
            on_release: root.ids.words_box.add_word_buttons()
'''


class Word_button(MDRaisedButton):
    correct = BooleanProperty()

    def check_word(self):
        print('Answer is ', self.correct)
        print('Button Text is ', self.text)


class Words_Box(MDBoxLayout):

    def add_word_buttons(self):
        app = MDApp.get_running_app()
        words = ['$WORD 1', 'WORD 2', 'WORD 3']
        for word in words:
            correct = False
            if '$' in word:
                correct = True
                word = word[1:]
            btn = Word_button(text=word, correct=correct)
            self.add_widget(btn)


class RootScreen(Screen):
    def __init__(self, **kwargs):
        super(RootScreen, self).__init__(**kwargs)


class Main(MDApp):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.screen = Builder.load_string(kv)

    def build(self):
        return self.screen


Main().run()

Answer 1

通过不命名 kv 文件 main.kv 解决了这个问题。