KivyMD 中用户输入的问题

Question

我在尝试获取用户输入并在另一个屏幕上使用时遇到了一些问题。首先，在第一个屏幕上，有一个 TextField 和一个 Button，当您单击该按钮时，它会将您带到另一个带有 MDLabel 和另一个按钮的屏幕。我的目的是在第一个屏幕上使用 TextField 获取用户名，然后在第二个屏幕上将其作为文本放入我的 MDLabel 中，例如 Hello, (user's name)

这是我的代码：

from kivymd.app import MDApp
from kivy.lang.builder import Builder
from kivy.uix.screenmanager import ScreenManager, Screen


screen_helper = """
ScreenManager:
    MenuScreen:
    ProfileScreen:
<MenuScreen>:
    name: 'menu'
    input_name: input_name
    MDTextField:
        id: input_name
        hint_text: 'Digite seu nome ou apelido'
        pos_hint:{'center_x':0.5,'center_y':0.7}
        color_mode:'custom'
        line_color_focus: 0.43, 0.82, 0.83, 0.6
        
    MDRectangleFlatButton:
        text: 'Entrar'
        pos_hint: {'center_x':0.5,'center_y':0.4}
        on_press: root.manager.current = 'profile'
        
        
<ProfileScreen>:
    name: 'profile'
    MDLabel:
        id: label_welcome
        text: "Hello,"
        halign: 'center'
    MDRectangleFlatButton:
        text: 'Back'
        pos_hint: {'center_x':0.5,'center_y':0.1}
        on_press: root.manager.current = 'menu'
        
"""


class MenuScreen(Screen):
    pass


class ProfileScreen(Screen):
    pass



# Create the screen manager
sm = ScreenManager()
sm.add_widget(MenuScreen(name='menu'))
sm.add_widget(ProfileScreen(name='profile'))


class DemoApp(MDApp):
    def build(self):
        screen = Builder.load_string(screen_helper)
        return screen


DemoApp().run()

Answer 1

您必须将 ID 与根小部件上的对象属性配对。

这可能不是最有效的方法，但它对我有用。

我在下面更改了您的代码，实际上是主要更改：

from kivymd.app import MDApp
from kivy.lang.builder import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.properties import ObjectProperty #<--- Object Property


screen_helper = """
MainScreenManager: # <--- changes here
    label_: label_welcome
    input_name: input_name
    
    MenuScreen:
        name: 'menu'
    
        MDTextField:
            id: input_name
            hint_text: 'Digite seu nome ou apelido'
            pos_hint:{'center_x':0.5,'center_y':0.7}
            color_mode:'custom'
            line_color_focus: 0.43, 0.82, 0.83, 0.6
            
        MDRectangleFlatButton:
            text: 'Entrar'
            pos_hint: {'center_x':0.5,'center_y':0.4}
            on_press: 
                root.ButtonFunction()
    ProfileScreen:
        name: 'profile'
        MDLabel:
            id: label_welcome
            text: "Hello,"
            halign: 'center'
        MDRectangleFlatButton:
            text: 'Back'
            pos_hint: {'center_x':0.5,'center_y':0.1}
            on_press: root.current = 'menu'
        

"""

class MainScreenManager(ScreenManager): #This gonna be the root widget
    label_      = ObjectProperty(None)
    input_name  = ObjectProperty(None)

    def ButtonFunction(self):
        self.current    = 'profile'
        self.label_.text = f'Hello, {self.input_name.text}'

class MenuScreen(Screen):
    pass


class ProfileScreen(Screen):
    pass



# Create the screen manager
sm = MainScreenManager()
sm.add_widget(MenuScreen(name='menu'))

sm.add_widget(ProfileScreen(name='profile'))


class DemoApp(MDApp):
    def build(self):
        screen = Builder.load_string(screen_helper)
        return screen


DemoApp().run()

KivyMD 中用户输入的问题

Problems with user's input in KivyMD

python

android

label

button

textfield