python and kivy input text in first windows after click button print ( text ) as label ( update label ) in second widows

Question

我想创建一个简单的应用程序，我是 python 的新手，这个应用程序包含两个 windows，首先 windows 有一个按钮（保存）和两个输入文本。 在第二个 windows 我们有四个 label。 after click on button in first windows the label ( username 1 print here ) in second windows change according text input in first windows. 在此处输入图像描述 在此处输入图像描述

当我运行我的代码时，label 没有改变，任何人都可以帮助我出了什么问题。

python代码

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.lang import Builder
from kivy.uix.screenmanager import Screen,ScreenManager
from kivy.properties import ObjectProperty

class Main_windows(Screen):
    f_user = ObjectProperty(None)
    player = ObjectProperty(None)

    def btn_save(self):
       self.player=self.f_user.text
class Second_windows(Screen):
    pass
class Windows_manager(ScreenManager):
    pass
kv=Builder.load_file("vop.kv")

class Vop(App):
    def build(self):
    return kv

kivy 代码：

## Collect our windows to windows manager ##
Windows_manager:
  Main_windows:
  Second_windows:


<Main_windows>:
  f_user:f_user



  name:"main_windows"
  BoxLayout:
    orientation:"vertical"
    Label:
        text: "Please insert Name of First Player"

    TextInput:
        id: f_user
        multiline:False
    Label:
        text: "please insert Name of Second Player"
    TextInput:
        id: s_user
        multiline:False

    Button:
        text:"Save"
        on_release:

            app.root.current="second_windows"
            root.manager.transition.direction="up"
            root.btn_save()


<Second_Windows>:

  player:player


  name:"second_windows"
  BoxLayout:
    orientation :"vertical"

    BoxLayout:
        orientation:"horizontal"

        Label:
            id:player
            text:"User number one"
        Label:
            id:player2
            text:"User number Two"
    BoxLayout:
        orientation:"horizontal"
        Label:
            text: "user name 1 print here"
        Label:
            text: "user name 2 print here"
    Button:
        text:"Back"
        on_release:
            app.root.current="main_windows"
            root.manager.transition.direction="down"

Answer 1

在代码中，主要目标是从一个 class 获取数据到另一个。 此方法仅在我们处理Screen和ScreenManager时有效。 我还试图弄清楚我们如何在类之间传输数据。 如果我想出另一种方法，我会更新我的答案。

python 代码：

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

class Main_windows(Screen):
    f_user = ObjectProperty(None)
       
class Second_windows(Screen):
    player1 = ObjectProperty(None)

class Windows_manager(ScreenManager):
    pass

class Vop(App):
    def build(self):
        return Builder.load_file("vop.kv")
    
if __name__ == "__main__":
    Vop().run()

kivy 代码：

## Collect our windows to windows manager ##

#: kivy 2.0.0

Windows_manager:
    Main_windows:
    Second_windows:

<Main_windows>:
    f_user:f_user

    name:"main_windows"

    BoxLayout:
        orientation:"vertical"
        Label:
            text: "Please insert Name of First Player"

        TextInput:
            id: f_user
            multiline:False
        Label:
            text: "please insert Name of Second Player"
        TextInput:
            id: s_user
            multiline:False

        Button:
            text:"Save"
            on_release:
                app.root.current="second_windows"
                root.manager.transition.direction="up"
                root.manager.get_screen('second_windows').player1.text = root.f_user.text

<Second_Windows>:

    name:"second_windows"

    player1: player1

    BoxLayout:
        orientation :"vertical"

        BoxLayout:
            orientation:"horizontal"

            Label:
                text:"User number one"
            Label:
                text:"User number Two"

        BoxLayout:
            orientation:"horizontal"
            Label:
                id: player1
                text: '' # change here
            Label:
                id: player2
                text: "user name 2 print here"
        Button:
            text:"Back"
            on_release:
                app.root.current="main_windows"
                root.manager.transition.direction="down"

应用截图