为什么 ConfigParserProperty 仅适用于以下示例中使用 kv 创建的 Widget

Why does ConfigParserProperty only work for Widgets created with kv in examples below

以下代码按我的预期工作。当我在 TextInput 中输入数字并按 RETURN 时,该数字显示在所有 3 个标签中。

#!/usr/bin/python
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ConfigParserProperty

Builder.load_string("""
<MyBoxLayout>
    TextInput:
        text: "insert Number <RETURN>"
        multiline: False
        on_text_validate: root.numberprop=self.text
    Label:
        text: str(root.numberprop)
    Label:
        text: str(root.numberprop)
    Label:
        text: str(root.numberprop)
""")

class MyBoxLayout(BoxLayout):
    numberprop= ConfigParserProperty(3, 'one', 'two', 'app',
                                  val_type=int, errorvalue=41)

class TstApp(App):
    def build_config(self, config):
        config.setdefaults('one', {'two' : '70'})

    def build(self, **kw):
        return MyBoxLayout()

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

下面的代码没有按我预期的那样工作。当我在 Textinput 中输入数字并按 RETURN 时,只有最后一个 Label 显示数字。

#!/usr/bin/python
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.properties import ConfigParserProperty

def MyConfigParserProperty():
    return ConfigParserProperty(3, 'one', 'two', 'app',
                                  val_type=int, errorvalue=41)

Builder.load_string("""
<MyBoxLayout>
    TextInput:
        text: "insert Number <RETURN>"
        multiline: False
        on_text_validate: root.numberprop=self.text

<MyLabel>
    text: str(root.numberprop)
""")

class MyLabel(Label):
    numberprop=MyConfigParserProperty()

class MyBoxLayout(BoxLayout):
    numberprop=MyConfigParserProperty()

    def __init__(self, **kw):
        super(MyBoxLayout, self).__init__(**kw)
        for i in range(3):
            self.add_widget(MyLabel())

class TstApp(App):
    def build_config(self, config):
        config.setdefaults('one', {'two' : '70'})

    def build(self, **kw):
        return MyBoxLayout()

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

我需要一种动态创建标签的方法。我该怎么做?

下面的代码解决了这个问题。

#!/usr/bin/python
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.properties import ConfigParserProperty

Builder.load_string("""
<MyBoxLayout>
    TextInput:
        text: "insert Number <RETURN>"
        multiline: False
        on_text_validate: app.numberprop=self.text

<MyLabel>
    text: str(app.numberprop)
""")

class MyLabel(Label):
    pass

class MyBoxLayout(BoxLayout):

    def __init__(self, **kw):
        super(MyBoxLayout, self).__init__(**kw)
        for i in range(3):
            self.add_widget(MyLabel())

class TstApp(App):
    numberprop=ConfigParserProperty(3, 'one', 'two', 'app',
                                  val_type=int, errorvalue=41)

    def build_config(self, config):
        config.setdefaults('one', {'two' : '70'})

    def build(self, **kw):
        return MyBoxLayout()

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