在kv-fi中使用“ids”时一次又一次出错

Question

嗯，我在kivy中使用“id”时遇到了一个问题。你知道吗

from twisted.internet import reactor, protocol
from twisted.protocols.basic import LineReceiver

class User(protocol.Protocol):
    def connectionMade(self):
        self.transport.write("hey brother")

    def dataReceived(self, data):
        print (data)

class ChatClientFActory(protocol.ClientFactory):
    protocol=User

    def __init__(self,app):
        self.app=app

class ClientFactory(protocol.ClientFactory):
    def buildProtocol(self, addr):
        return User()

def run():
    reactor.connectTCP("localhost",8000,ClientFactory())
    reactor.run()


from kivy.app import App
from kivy.uix.relativelayout import RelativeLayout
from kivy.lang import Builder
from kivy.uix.screenmanager import Screen, ScreenManager

Builder.load_file("chat.kv")
Builder.load_file("chat2.kv")

class User1(Screen):
    pass
class User2(Screen):
    pass

s=ScreenManager()
s.add_widget(User1(name="start"))
s.add_widget(User2(name="let's_chat"))

class ChatApp(App):
    def connect(self):
        print(self.root.ids.message.text)
        self.parent.current="let's_chat"

    def build(self):
        return s

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

当我使用“self.root.ids.消息.text，它总是显示“'super'对象没有属性'getattr”。我找了很多遍，但没有找到解决办法。下面是的kv文件本文件：你知道吗

<User1>:
    RelativeLayout:
        TextInput:
            text:
            pos_hint:{"center_x":.5,"center_y":.5}
            size_hint: .3, .2
        Button:
            text:"start"
            pos_hint:{"x":0,"bottom":0}
            size_hint: .3, .2
            on_press:
                app.connect()

请帮忙。你知道吗

Answer 1

ScreenManager不是ChatApp的父级。您需要找到一种正确引用小部件的方法。这是一个可能的解决方案的草图。虽然没有测试！或者，尝试扩展ScreenManager，然后使用StringProperty、ObjectProperty和ids。希望它有帮助，虽然没有测试。如果您有一个没有twisted的独立示例，我可以帮助您更好地测试我的解决方案。你知道吗

Python

class ChatApp(App):
    sm = ObjectProperty()
    screen1 = ObjectProperty()
    screen2 = ObjectProperty()

    def connect(self):
        print(self.screen1.ids.txtinpt.text)
        self.sm.current="let's_chat"

    def build(self):
        self.sm=ScreenManager()
        self.screen1 = User1(name="start")
        self.screen2 = User2(name="let's_chat")
        self.sm.add_widget(self.screen1)
        self.sm.add_widget(self.screen2)
        return self.sm

千伏

<User1>:
    RelativeLayout:
        TextInput:
            id: txtinpt
            pos_hint:{"center_x":.5,"center_y":.5}
            size_hint: .3, .2

Answer 2

这里是整个程序没有扭曲它非常简单，但我有困难，从一个kv按钮调用方法。你知道吗

你知道吗聊天.py你知道吗

from kivy.app import App
from kivy.uix.relativelayout import RelativeLayout
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen, ObjectProperty

Builder.load_file("chat.kv")
Builder.load_file("chat2.kv")


class User1(Screen):
    pass

class User2(Screen):
    pass


class ChatApp(App):
    sm = ObjectProperty()
    screen1 = ObjectProperty()
    screen2 = ObjectProperty()

    def connect(self):
        print(self.screen1.ids.txtinpt.text)

    def build(self):
        self.sm=ScreenManager()
        self.screen1 = User1(name="start")
        self.screen2 = User2(name="chat_screen")
        self.sm.add_widget(self.screen1)
        self.sm.add_widget(self.screen2)
        return self.sm






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

你知道吗千伏你知道吗

<User1>:
    RelativeLayout:
        TextInput:
            id:Username
            pos_hint:{"center_x": .5, "center_y": .7}
            size_hint: .3, .2
        TextInput:
            id:Password
            pos_hint:{"center_x": .5, "center_y": .5}
            size_hint: .3, .2
        Button:
            text:"send"
            pos_hint:{"center_x": .5, "center_y": .3}
            size_hint: .3, .2
            on_press:
                root.manager.current="chat_screen"

2.2千伏

<User2>:
    RelativeLayout:
        Label:
            id:show_msg
            text:""
            pos_hint:{"x":0,"top":1}
            size_hint_x: root.width
            size_hint_y: .5
        TextInput:
            id:txt_msg
            pos_hint:{"x": 0, "bottom": 0}
            size_hint: .6, .2
            multiline:False
        Button:
            text:"send_msg"
            pos_hint:{"x": .7, "bottom": 0}
            size_hint: .3, .2
            on_press:
                app.connect()

其显示错误：

File "/root/PycharmProjects/Chat/chat2.kv", line 19, in <module>
     app.connect()
   File "/root/PycharmProjects/Chat/Chat.py", line 23, in connect
     print(self.screen1.ids.txtinpt.text)
   File "kivy/properties.pyx", line 839, in kivy.properties.ObservableDict.__getattr__ (/tmp/pip-build-0vou9szt/kivy/kivy/properties.c:12654)
 AttributeError: 'super' object has no attribute '__getattr__'

对不起，如果我做了蠢事。我想我在使用app方法调用任何函数时都有困难。如果是，请告诉我如何使用“self.app软件". 你知道吗