Kivy/python：如何从 .py 文件中检查复选框

Question

我用 Python (test.py) 和 kivy (test.kv) 编写了一些代码。 当我运行 test.py 时，男性复选框显示选中，女性复选框未选中，因为我在 test.kv 文件中使用：

active: root.male

但我想从 .py 文件中得到同样的东西。如何从 .py 文件中检查男性复选框？

test.py

from kivy.uix.screenmanager import Screen
from kivy.app import App
from kivy.lang import Builder
from kivy.core.window import Window
from kivy.properties import ObjectProperty

Window.size = (600, 325)

class UserGroup(Screen):
    male = ObjectProperty(None)
    female = ObjectProperty(None)
    age = ObjectProperty(None)

    def insert_data(self):
        print('')


class FactUserGroup(App):

    def build(self):
        self.root = Builder.load_file('test.kv')
        return self.root


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

test.kv

<CustomLabel@Label>:
    text_size: self.size
    valign: "middle"
    padding_x: 5

<SingleLineTextInput@TextInput>:
    multiline: False

<GreenButton@Button>:
    background_color: 1, 1, 1, 1
    size_hint_y: None
    height: self.parent.height * 0.120

UserGroup

    male: chk_male
    female: chk_female

    GridLayout:
        cols: 2
        padding : 30,30
        spacing: 20, 20
        row_default_height: '30dp'

        Label:
            text: 'Male'
            text_size: self.size
            valign: 'middle'

        CheckBox:
            group: 'check'
            id : chk_male
            active: root.male

        Label:
            text: 'Female'
            text_size: self.size
            valign: 'middle'

        CheckBox:
            group: 'check'
            id: chk_female


        GreenButton:
            text: 'Ok'


        GreenButton:
            text: 'Cancel'
            on_press: app.stop()

有人可以帮我吗？

Answer 1

解决方法是使用BooleanProperty，并添加active: root.female。在示例中，它说明了 Kivy 应用程序运行时，女性的复选框处于活动状态（图 1），5 秒后，它将使用 Clock.schedule_once 自动切换到男性的复选框（图 2）。

test.py

​​>

from kivy.properties import ObjectProperty, BooleanProperty
...
class UserGroup(Screen):
    male = BooleanProperty(False)
    female = BooleanProperty(True)

test.kv

    CheckBox:
        group: 'check'
        id: chk_female
        active: root.female

示例

test.py

​​>

from kivy.uix.screenmanager import Screen
from kivy.app import App
from kivy.lang import Builder
from kivy.core.window import Window
from kivy.properties import ObjectProperty, BooleanProperty
from kivy.clock import Clock

Window.size = (600, 325)


class UserGroup(Screen):
    male = BooleanProperty(False)
    female = BooleanProperty(True)
    age = ObjectProperty(None)

    def __init__(self, **kwargs):
        super(UserGroup, self).__init__(**kwargs)
        Clock.schedule_once(self.switch_checkbox, 5)

    def switch_checkbox(self, dt):
        self.female = False
        self.male = True

    def insert_data(self):
        print('')


class FactUserGroup(App):

    def build(self):
        self.root = Builder.load_file('test.kv')
        return self.root


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

test.kv

#:kivy 1.10.0
<CustomLabel@Label>:
    text_size: self.size
    valign: "middle"
    padding_x: 5

<SingleLineTextInput@TextInput>:
    multiline: False

<GreenButton@Button>:
    background_color: 1, 1, 1, 1
    size_hint_y: None
    height: self.parent.height * 0.120

UserGroup:

    GridLayout:
        cols: 2
        padding : 30,30
        spacing: 20, 20
        row_default_height: '30dp'

        Label:
            text: 'Male'
            text_size: self.size
            valign: 'middle'

        CheckBox:
            group: 'check'
            id : chk_male
            active: root.male

        Label:
            text: 'Female'
            text_size: self.size
            valign: 'middle'

        CheckBox:
            group: 'check'
            id: chk_female
            active: root.female


        GreenButton:
            text: 'Ok'


        GreenButton:
            text: 'Cancel'
            on_press: app.stop()

输出