更新Kivy Popup中显示的进度条 - python

您如何更新Kivy中显示的进度条。在以下示例中，我得到AttributeError: 'super' object has no attribute '__getattr__'。问题在以下行中

self.ids.progress.value = value

我可以理解为什么progressBar小部件位于<LoadingPopup>中而不是<MainScreen>中，但是尝试了几种不同的操作后，我无法从progressBar引用<LoadingPopup>中的do_update method小部件。

提前致谢

import threading
from functools import partial

from kivy.lang import Builder
from kivy.uix.floatlayout import FloatLayout
from kivy.properties import StringProperty
from kivy.uix.spinner import Spinner
from kivy.app import App
from kivy.clock import Clock
from kivy.uix.popup import Popup



Builder.load_string('''

<LoadingPopup>:
    title: "Popup"
    size_hint: None, None
    size: 400, 400
    auto_dismiss: False

    BoxLayout:
        orientation: "vertical"
        ProgressBar:
            id: progress
            size_hint: (1.0, 0.06)

<MainScreen>:
    BoxLayout:
        orientation: 'vertical'

        Spinner:
            id: first
            text: ' First Number'
            values: ['1','2','3','4','5','6','7','8','9']

        Spinner:
            id: second
            text: ' Second Number'
            values: ['1','2','3','4','5','6','7','8','9']

        Label:
            id: result
            text: ' Result'
            color: 0,0,0,1
        Button:
            id: res
            on_press: root.doit_in_thread(first.text,second.text)
            text: 'Multiply'


''')

class LoadingPopup(Popup):

    def __init__(self, obj, **kwargs):
        super(LoadingPopup, self).__init__(**kwargs)


class MainScreen(FloatLayout):
    changet = StringProperty()
    def __init__(self, **kwargs):
        super(MainScreen, self).__init__(**kwargs)

    def doit_in_thread(self, fir, sec):
        popup = LoadingPopup(self)
        popup.open()
        threading.Thread(target=partial(self.onMul, fir, sec, popup)).start()

    def do_update(self, value, text, *args):
        self.ids.progress.value = value
        self.ids.result.text = text

    def onMul(self,fir,sec, popup):
        a = (int(fir)*int(sec))
        print(a)
        b = 0
        old_value = 0
        endRange = 1000000
        for i in range(endRange):
            progress = int(((i+1)*100)/endRange)
            if progress != old_value and progress % 5 == 0:
                text = str(b*(int(fir)*int(sec)))
                Clock.schedule_once(partial(self.do_update, progress, text))
                old_value = progress
            b+=1

        popup.dismiss()

class TestApp(App):
    def build(self):
        return MainScreen()

if __name__ == "__main__":
    TestApp().run()

参考方案

一种方法是保留对弹出窗口的引用，以便稍后进行处理：

def __init__(self, **kwargs):
    super(MainScreen, self).__init__(**kwargs)
    self.popup = LoadingPopup(self)

def doit_in_thread(self, fir, sec):
    self.popup.open()
    threading.Thread(target=partial(self.onMul, fir, sec, self.popup)).start()

def do_update(self, value, text, *args):
    self.popup.ids.progress.value = value
    self.ids.result.text = text

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