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我是 kivy 和 kivymd 的新手。我想从文本输入中获取文本。但是我遇到了从按钮调用 python 文件中的提交函数的问题。我使用了导航抽屉代码。我应该在ContentNavigationDrawer 类或 TestNavigationDrawer类中定义提交函数吗？在此先感谢以下是代码

.py

from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ObjectProperty
from kivy.properties import StringProperty, ListProperty
from kivymd.uix.list import OneLineIconListItem, MDList

from kivymd.app import MDApp




class ItemDrawer(OneLineIconListItem):
    icon = StringProperty()
    text_color = ListProperty((0, 0, 0, 1))


class ContentNavigationDrawer(BoxLayout):
    screen_manager = ObjectProperty()
    nav_drawer = ObjectProperty()



class TestNavigationDrawer(MDApp):
    namee = ObjectProperty()


    def build(self):
        kv= Builder.load_file("screenmd.kv")
        self.theme_cls.primary_palette = "Red"
        return kv

    def submit(self):
        print(self.namee.text)




TestNavigationDrawer().run()

.kv

<ContentNavigationDrawer>:
    orientation: "vertical"
    padding: "8dp"
    spacing: "8dp"

    AnchorLayout:
        anchor_x: "left"
        size_hint_y: None
        height: avatar.height

        Image:
            id: avatar
            size_hint: None, None
            size: "56dp", "56dp"
            source: "data/logo/kivy-icon-256.png"

    MDLabel:
        text: "KivyMD library"
        font_style: "Button"
        size_hint_y: None
        height: self.texture_size[1]

    MDLabel:
        text: "kivydevelopment@gmail.com"
        font_style: "Caption"
        size_hint_y: None
        height: self.texture_size[1]

    ScrollView:

        MDList:

            OneLineListItem:
                text: "Screen 1"
                on_press:
                    root.nav_drawer.set_state("close")
                    root.screen_manager.current = "scr 1"

            OneLineListItem:
                text: "Screen 2"
                on_press:
                    root.nav_drawer.set_state("close")
                    root.screen_manager.current = "scr 2"


Screen:

    MDToolbar:
        id: toolbar
        background_color: app.theme_cls.primary_dark
        pos_hint: {"top": 1}
        elevation: 10
        title: "Iota World"
        left_action_items: [["menu", lambda x: nav_drawer.set_state("open")]]

    NavigationLayout:
        x: toolbar.height

        ScreenManager:
            id: screen_manager

            Screen:
                name: "scr 1"

                namee:namee


                MDTextField:
                    id:namee
                    hint_text: "Name"
                    helper_text:"forget"
                    pos_hint : {'center_x':0.5 ,'center_y':0.5}
                    size_hint_x : None
                    width: 300
                MDRectangleFlatButton:
                    text: "Submit"
                    pos_hint : {'center_x':0.5 ,'center_y':0.4}
                    text_color: 0, 0, 1, 1
                    md_bg_color: 1, 1, 0, 1
                    on_release:
                        print("success")
                        app.submit()


            Screen:
                name: "scr 2"

                MDLabel:
                    text: "Screen 2"
                    halign: "center"

        MDNavigationDrawer:
            id: nav_drawer

            ContentNavigationDrawer:
                screen_manager: screen_manager
                nav_drawer: nav_drawer
                id: content_drawer

错误

print(self.namee.text)
 AttributeError: 'NoneType' object has no attribute 'text'
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1 回答 1

1

您需要在您的打印语句中使用self.root.ids.namee.text而不是。self.namee.text

于 2020-08-20T15:50:10.827 回答