将 TextInput 更改为仅显示 Kivy Python 的函数

Question

我对 kivy 还是新手，对 Python 还是比较陌生。 我有主py。我计划让WindowGUI 从 main.py 获取一些输入并将它们显示在其文本框中。 这是我所拥有的：

from os import curdir
from posixpath import dirname
import kivy
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout  # one of many layout structures
from kivy.uix.textinput import TextInput  # allow for ...text input.
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.uix.widget import Widget
from kivy.core.window import Window
from kivy.uix.spinner import Spinner
from kivy.uix.dropdown import DropDown
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.lang import Builder
from kivy.properties import ObjectProperty
kivy.require('2.0.0')

class MainGUI(Screen):
    encoder = ObjectProperty()
    mileage = ObjectProperty()
    voltage = ObjectProperty()
    power = ObjectProperty()
    camera = ObjectProperty()
    engaged = ObjectProperty()
    idle = ObjectProperty()
    log = ObjectProperty()
    clear = ObjectProperty()
    status = ObjectProperty(None)

    def __init__(self, saySomething): 
        super().__init__() #Go up to __init__ of App
        self.saySomething = saySomething
    
    def power_option(self):
        self.power.text = "Power"
    
    def print_status(self):
        self.ids.Status_screen.text = self.saySomething
        return self.ids.Status_screen.text

class CameraGUI(Screen):
    def __init__(self, **kwargs): #kwargs is just a variable. it could be "banana" or "apple"
        super().__init__() #Go up to __init__ of App

class GUIManager(ScreenManager):
    pass

kv = Builder.load_file('newWindow.kv')

class WindowGUI(App):
    def __init__(self):
        super().__init__()
        # self.say = say
        print("TRY ME!!!!")
        
    
    def build(self):
        self.title = 'IamHero'
        return kv
    
if __name__ == '__main__':
   myWindowGUI = WindowGUI()
   myMainGUI = MainGUI('I am hero!')
   myWindowGUI.run()

###########################_newWindow.kv_#############################

GUIManager:
    MainGUI:
    CameraGUI:

<MainGUI>:
    name: "main"

    status: Status_screen
    GridLayout:
        cols: 2
        size: root.width, root.height #covers entire window
        padding: 15
        
        GridLayout:
            cols:1
            spacing: 10
            GridLayout:
                cols:2
                size_hint: .25,.1  
                Label:
                    id: Engaged
                    text: "Engaged"   
                Label:
                    id: Idle
                    text: "Idle"
            TextInput:
                # size_hint: 1
                id: Status_screen
                multiline: True
                readonly: True
                background_color: .6, .7, 0, 1
                text: root.print_status()
                #on_text: root.print_status()
               
            GridLayout:
                cols:2
                size_hint: .25,.1  
                Button:
                    id: Log
                    text: "Log status"
                    # size_hint_x: .5
                Button:
                    id: Clear
                    text: "Clear"

但是，我收到以下错误：

 Traceback (most recent call last):
   File "c:/Users/Jojo/#RaspberryPi4/Test/WindowGUI.py", line 57, in <module>
     kv = Builder.load_file('newWindow.kv')
   File "C:\Users\Jojo\Anaconda3\lib\site-packages\kivy\lang\builder.py", line 306, in load_file
     return self.load_string(data, **kwargs)
   File "C:\Users\Jojo\Anaconda3\lib\site-packages\kivy\lang\builder.py", line 408, in load_string
     self._apply_rule(
   File "C:\Users\Jojo\Anaconda3\lib\site-packages\kivy\lang\builder.py", line 659, in _apply_rule
     child = cls(__no_builder=True)
 TypeError: __init__() got an unexpected keyword argument '__no_builder'

关于我做错了什么有什么想法吗？

Answer 1

您不能在您打算在kv 中使用的类的__init__() 中要求位置参数。你的__init__() 为MainGUI：

def __init__(self, saySomething):

需要saySomething 的参数。一个简单的解决方法是将saySomething 变成StringProperty 的MainGUI。那么你甚至不需要实现__init__()：

class MainGUI(Screen):
    encoder = ObjectProperty()
    mileage = ObjectProperty()
    voltage = ObjectProperty()
    power = ObjectProperty()
    camera = ObjectProperty()
    engaged = ObjectProperty()
    idle = ObjectProperty()
    log = ObjectProperty()
    clear = ObjectProperty()
    status = ObjectProperty(None)
    saySomething = StringProperty('Hi')

    # def __init__(self, saySomething):
    #     super().__init__() #Go up to __init__ of App
    #     self.saySomething = saySomething

然后您可以像设置kv 中的任何其他属性一样设置saySomething 的值：

<MainGUI>:
    name: "main"

    status: Status_screen
    saySomething: 'I am hero!'

或者在python中你可以这样做：

MainGUI(saySomething='I am hero!')

还有一行：

myMainGUI = MainGUI('I am hero!')

（将不再起作用）正在创建一个未使用的 MainGUI 实例。这样就可以删除那行代码了。