Kivy和Python线程-如何在它们之间获取数据

我在python(threading)和kivy上遇到一些问题：

这是一些代码：

import kivy
import threading 
import time
from kivy.app import App
from kivy.uix.button import Button

class Thread(threading.Thread):
    def __init__(self):
        threading.Thread.__init__(self)  
        self.counter = 0        
    def run(self):
        while True:
            print "Thread is running " str(self.counter)
            app.button.text = self.set_button(self.counter)
            app.button.text = str(self.counter)
            time.sleep(0.5)
    def count(self):
        self.counter  = 1
        app.button.text = str(self.counter)     
    def set_button(self, value):
        app.button.text = str(value)

class MyApp(App):
    def __init__ (self, thread_object):
        App.__init__(self) 
        self.thread_object = thread_object      
    def callback(self,instance):
        print('The button <%s> is being pressed' % instance.text)
        self.thread_object.count()
    def build(self):
        self.button = Button(text='Hello World')
        self.button.bind(on_press=self.callback)
        return self.button

thread = Thread()
thread.start()
app = MyApp(thread)
app.run()

现在-此代码只需一个按钮即可打开kivy应用程序.任务是：按下按钮,一些数据应显示在线程代码中(通过“ count”方法执行).

问题是相反的-线程代码应更改按钮的文本.我尝试了两种方法：

>直接编写：app.button.text = str(self.counter)
>通过“ set_button”方法编写：app.button.text = self.set_button(self.counter)

它们都显示错误“属性错误：’MyApp’对象没有属性’按钮’”.

有没有任何方法可以直接交换数据而无需请求,即使不使用“ thread_object”在此处进行指针操作

def __init__ (self, thread_object):

谢谢你的帮助.

解决方法:

这可能会解决您的所有问题.那就是我喜欢在处理线程和奇异语言时进行编码的方式.

这是thread.py文件

import threading   
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import NumericProperty

class Thread(BoxLayout):
    counter = NumericProperty(0)

    def Counter_function(self):
        self.counter  = 1
        self.ids.lbl.text = "{}".format(self.counter)

    def First_thread(self):
        threading.Thread(target = self.Counter_function).start()
        self.counter  = 1
        self.ids.lbl.text = "{}".format(self.counter)

class MyApp(App):
    def build(self):
        self.load_kv('thread.kv')
        return Thread() 

if __name__ == "__main__":
    app = MyApp()
    app.run()

这是thread.kv文件

<Thread>:
    Button:
        text: "use thread"
        on_release: root.First_thread()
    Button:
        text: "Hit me"
        on_release: root.Counter_function()
    Label:
        id: lbl
        text: "Numbers"

现在,您在评论中说,您在动态加载GUI方面遇到困难.所以,这是一个例子.

Builder.load_string('''
[SideBar@BoxLayout]:
    content: content
    orientation: 'vertical'
    size_hint: .2,1
    BoxLayout:
        orientation: 'vertical'
        # just add a id that can be accessed later on
        id: content

<Root>:
    Button:
        center_x: root.center_x
        text: 'press to add_widgets'
        size_hint: .2, .2
        on_press:
            sb.content.clear_widgets()
            root.load_content(sb.content)
    SideBar:
        id: sb
''')

class Root(BoxLayout):

    def load_content(self, content):
        for but in range(20):
            content.add_widget(Button(text=str(but)))

class MyApp(App):
    def build(self):
        return Root()

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