无法使ObjectProperty与python中的Kivy一起使用

贝克101

我一直在努力寻找解决方案。我宁愿不在python中创建按钮，因为我试图使样式远离功能。每当我尝试使用对象属性时，它都会报告此错误。我一直在尝试在stackoverflow上尝试一堆解决方案，因此我希望有人可以帮助我。

TypeError: bind() takes exactly 2 positional arguments (0 given)

至于实际的代码，这是python：

# Function import libraries
import sys
import json
import googlemaps
import pygatt
import time
import asyncio
from bleak import discover
from urllib.request import urlopen
from twilio.rest import Client
import asynckivy as ak
from asynckivy.process_and_thread import \
    thread as ak_thread, process as ak_processt


# UI import libraries
from kivy.app import App
from  kivy.properties import ObjectProperty
from kivy.properties import StringProperty
from kivy.uix.widget import Widget
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.anchorlayout import AnchorLayout
from kivy.uix.label import Label
from kivy.uix.image import Image
from functools import partial
from kivy.event import EventDispatcher

class Screen1(Screen):
    def __init__ (self,**kwargs):
        super (Screen1, self).__init__(**kwargs)

        pairbtn = ObjectProperty(None)
        pairbtn.bind(on_press=self.pair_pressed)
        # self.add_widget(pairbtn)

    def pair_pressed(self, event):
        async def run():
            devices = await discover()
            for d in devices:
                print(d)
                if (str(d).find('DSD TECH') != -1):
                    address = str(d)[0:17]
                    print("Device Discovered" + address)
                    exit()
        loop = asyncio.get_event_loop()
        loop.run_until_complete(run())




class Screen2(Screen):
    pass



class esosApp(App):
    def build(self):
        screen_manager = ScreenManager()
        screenone = Screen1(name='s1')
        screentwo = Screen2(name='s2')

        screen_manager.add_widget(screenone)
        screen_manager.add_widget(screentwo)

        return screen_manager    


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

这是kv文件（省略screen2）：

#:kivy 1.11.1

<Screen1>:

    orientation: "vertical"
    pairbtn: pairbtn

    canvas.before:
        Color:

            rgb: 0.965,0.965, 0.965
        Rectangle:
            pos: self.pos
            size: self.size
    Image:
        source: 'icon.png'
        size: self.texture_size
    AnchorLayout:
        anchor_y: 'top'
        BoxLayout:
            size_hint: 1,.07

            canvas.before:
                Color:
                    rgb: 0.6745 , 0.8353 , 0.8784
                Rectangle:
                    pos: self.pos
                    size: self.size
            Image:
                source: 'Logo.PNG'
                size: self.texture_size
        AnchorLayout:
            anchor_x: 'center'
            anchor_y: 'bottom'
            padding: (0, 10, 0, 10)

            Button:
                id: pairbtn
                text: "Pair Device"
                background_normal: ''
                background_color: 0.6745 , 0.8353 , 0.8784, 1
                size_hint: (.8, .1)

永乐

属性不应也不能在类的方法中声明，而应在方法的同一级别上声明，例如：

class Foo(Base):
    prop = XProperty(default_value)

    def __init__(self, **kwargs):
        super().__init__(self, **kwargs)
    # ...

显然，您的代码不满足该条件，逻辑pairbtn也是“无”，因此您无法使用on_press进行绑定，最后最简单的方法是在kv中建立连接：

# ...
Button:
    id: pairbtn
    text: "Pair Device"
    background_normal: ''
    background_color: 0.6745 , 0.8353 , 0.8784, 1
    size_hint: (.8, .1)
    on_press: root.pair_pressed()

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