kivymd 文本字段剧照在输入后显示字段中的 hint_text

Question

我在使用 MDTextField 时遇到问题。它在键入时继续在文本字段内显示提示。我试过设置背景色来隐藏它，但没有用。我看了一些教程，每个人似乎都和我一样在做，而且它只适用于其他人，所以我觉得我做错了什么。

Image of what happens this is my first post so i am not aloud to post images :)

任何帮助将不胜感激。提前致谢。

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'

Answer 1

通过将您的 kv 文件命名为 main.kv，您将利用自动加载正确命名的 kv 文件的优势，如 documentation 中所述。但是，您还使用 Builder.load_file("main.kv") 加载了相同的文件。多次加载同一个 kv 文件可能会导致您遇到的这类问题。您可以通过简单地消除对 Builder.load_file("main.kv") 的调用或删除整个 build() 方法，或者通过更改 kv 文件或 MainApp class.

kivymd 文本字段剧照在输入后显示字段中的 hint_text

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