kivymd文本字段静止显示在字段中的hint_text键

Question

任何帮助将不胜感激。预先感谢

main.py

from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.floatlayout import FloatLayout
from kivy.core.window import Windowfrom kivy.config import Config
from kivy.uix.screenmanager import ScreenManager, Screen
from kivymd.theming import ThemeManager
from kivy.lang import Builder
from kivymd.app import MDApp
from kivy.graphics import Rectangle, Color
import pymysql


class WelcomeScreen(Screen):
    pass


class LoginScreen(Screen):
    pass


class RegisterScreen(Screen):
    pass


class WindowManager(ScreenManager):
    pass


class MainApp(MDApp):

    def build(self):
        # theme_cls = ThemeManager()
        return Builder.load_file("main.kv")

    def change_screen(self, screen, direction):
        self.root.transition.direction = direction
        self.root.current = screen


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

main.kv

#: import Window kivy.core.window.Window
#: import MDLabel kivymd.uix.label.MDLabel
#: import Rectangle kivy.graphics.Rectangle
#: import Color kivy.graphics.Rectangle


WindowManager:
    WelcomeScreen:
    LoginScreen:
    RegisterScreen:



<WelcomeScreen>:
    name: "welcome_screen"




    FloatLayout:
        orientation: "vertical"

        MDToolbar:
            id: toolbar
            title: "SecureIT 24/7"
            pos_hint: {'top': 1}



        Button:

            text: 'Login'
            color: 1, 1, 1, 1
            size_hint: 0.25, 0.25
            pos_hint: {"right":0.625, "top":0.80}
            on_release:
                app.root.current = "login_screen"

        Button:

            text: 'Register'
            color: 1,1,1,1
            size_hint: 0.25, 0.25
            pos_hint: {"right":0.625, "top":0.55 }
            on_release:
                app.root.current = "register_screen"


<LoginScreen>:
    name: "login_screen"
    FloatLayout:
        MDBanner:
            id: banner
            text: "Login"
            # The widget that is under the banner.
            # It will be shifted down to the height of the banner.

        MDToolbar:
            id: toolbar
            title: "Login"
            elevation: 10
            pos_hint: {'top': 1}
            left_action_items: [['arrow-left', lambda screen: app.change_screen('welcome_screen', 'right')]]

    FloatLayout:
        padding: [50,50,50,50]
        spacing: 50

        FloatLayout:

            orientation: 'vertical'

            Label:
                text: 'Login'
                font_size: 18
                halign: 'center'
                text_size: root.width-20, 20
                color: 0,0,0,1
                pos_hint: {"right":1, "top":1.25}

            TextInput:
                id: login
                multiline:False
                font_size: 28
                size_hint: 0.50, 0.10
                pos_hint: {"right":0.75, "top":0.70}

        FloatLayout:

            orientation: 'vertical'

            Label:
                text: 'Password'
                halign: 'center'
                font_size: 18
                text_size: root.width-20, 20
                color: 0,0,0,1

            TextInput:
                id: password
                multiline:False
                password:True
                font_size: 28
                size_hint: 0.50, 0.10
                pos_hint: {"right":0.75, "top":0.45}

            Button:
                text: 'Login'
                size_hint: 0.25, 0.25
                font_size: 24
                pos_hint: {"right":0.625, "top":0.30}

<WhiteLabel@MDLabel>
    height: self.texture_size[1]
    theme_text_color: "Custom"
    text_color: 1, 1, 1, 1

<CustomInput@MDTextField>
    multiline:False
#    required: True
    mode: "line"
    pos_hint: {"right": 0.456}
    current_hint_text_color: [0,0,0,0.5]



<RegisterScreen>:
    name: "register_screen"
    FloatLayout:
        MDBanner:
            id: banner
            text: "ioshrdioaoisdhf"

        MDToolbar:
            id: toolbar
            title: "Register"
            elevation: 10
            pos_hint: {'top': 1}
            left_action_items: [['arrow-left', lambda screen: app.change_screen('welcome_screen', 'right')]]

            BoxLayout:
                orientation: "vertical"
                height: self.minimum_height * 2
                size_hint_y: None
                pos_hint: {"top": 2}

                CustomInput:
                    id: firstname
                    hint_text: "color_mode = 'custom'"


                CustomInput:
                    id: surname
                    hint_text: 'Surname'

                CustomInput:
                    id: email
                    hint_text: 'Email'

通过将您的文件命名为

kv

，您正在利用正确命名的

main.kv

Answer 1

documentation

中所述。但是，您还使用

kv

加载了同一文件。多次加载相同的文件可能会导致您看到的问题。您可以通过简单地消除调用

Builder.load_file("main.kv")

或删除整个

kv

方法或更改Builder.load_file("main.kv")文件或

build()

类的名称来解决问题。