Python Kivy MDToolBar右(行动)项：Can'；不要换屏幕

就我的一生而言，我似乎不知道如何使用MDToolBar

right\u action\u items:

来更改屏幕。我知道，通过发布上的按钮

：

我可以添加一个简单的

app.root.current='analyzer'

（我将我的屏幕定义为'analyzer'和'main'）

但是，您不能将此代码添加到

右侧\u操作\u项：Lambda x:app.root.current='analyzer'

，单位为kv。 所以我尝试在python中添加一个函数，在我的

管理器（ScreenManager）

-->

但它不起作用。。。我迷路了，困惑，害怕。。。救命啊。我请

main.py

from kivymd.app import MDApp
from kivymd.theming import ThemeManager
from kivymd.uix.dialog import MDDialog
from kivy.uix.screenmanager import Screen, ScreenManager
from kivymd.uix.list import TwoLineListItem
from kivymd.uix.button import MDIconButton
from kivymd import *

from PyDictionary import PyDictionary
import sys
import json
import requests


class Manager(ScreenManager):
    def change_screen(self, inst):
        Manager.current = f'{inst.ids.main.text}'

class Main(Screen):
    """main application goes here"""
    def close_dialog(self, obj):
        self.dialog.dismiss()

    def show_data(self):
        message = """
        Think of Probably Knot (PK) as a study
        guide of sorts. Helping the user guide
        himself.

        This little program was designed to help
        re-think ones sentences and therefore 
        find new solutions. By changing ones
        perception, things can become more clear
        where once they were misunderstood.

        PK re-shuffle a word from an input
        sentence to help rephrase ones 
        orignal sentence. To better
        understand problems and ideas by
        changing the angle of perception
        with more elegant solutions.
        """
        close = MDIconButton(icon="close-circle", on_release=self.close_dialog)
        #more = MDIconButton(icon="more")
        self.dialog = MDDialog(title="Probably Knot Helper", text=message,
                         size_hint=(0.8, 1), buttons=[close])
        self.dialog.open()


class Analyzer(Screen):
    def analyze(self, main): # main is pointing to ---> Main().show_data()
        """Analyse data with PyDictionary"""

        sent = main.ids.sentence.text.lower()
        wrd = main.ids.word.text.lower()
        print(sent, wrd)

        # Definition Section #
        dictionary = PyDictionary()
        define_wrd = dictionary.meaning(wrd)

        if wrd != '' and sent != '':
            API_KEY = 'a701e74e453ee6695e450310340401f5'
            URL = f'http://words.bighugelabs.com/api/2/{API_KEY}/{wrd}/json'

            if wrd not in sent:
                print("i made it")
                error = MDDialog(title="Error", text=f"Word: '{wrd}' is not in\n\n'{sent}'")
                error.open()
            else:
                r = requests.get(URL) # get's url json file
                j = json.loads(r.text) # loads json into 'j' as a dict

                if type(j) == dict: # check is 'j' variable is coming in as a Dict holds the new sentences new = f"{result}\n"
                    final_set = set()
                    try:
                        for w in j['adjective']['syn']:
                            final_set.add(w)
                    except KeyError:
                        print(f'Adjective for "{wrd}" is not found.')
                    try:
                        for w in j['noun']['syn']:
                            final_set.add(w)
                    except KeyError:
                        print(f'Noun for "{wrd}" is not found.') 
                    try:
                        for w in j['verb']['syn']:
                            final_set.add(w)
                    except KeyError:
                        print(f'Verb for "{wrd}" is not found.')
                    item = TwoLineListItem(text=f"Original: {sent}", secondary_text=f"{wrd}")
                    self.ids.container.add_widget(item)
                    for word in final_set:
                        item = TwoLineListItem(text=f"{sent.replace(wrd, word)}", secondary_text=f"{word}")
                        self.ids.container.add_widget(item)
                    # try:
                    #     for num, w in enumerate(j['adjective']['syn'], 1):
                    #         item = OneLineListItem(text=f"{num}: {sent.replace(wrd, w)}\n")
                    #         self.ids.container.add_widget(item)
                    # except KeyError:
                    #     print(f'Adjective for "{wrd}" is not found.')
                    # try:
                    #     for num, w in enumerate(j['noun']['syn'], 1):
                    #         item = OneLineListItem(text=f"{num}: {sent.replace(wrd, w)}\n")
                    #         self.ids.container.add_widget(item)
                    # except KeyError:
                    #     print(f'Noun for "{wrd}" is not found.') 
                    # try:
                    #     for num, w in enumerate(j['verb']['syn'], 1):
                    #         item = OneLineListItem(text=f"{num}: {sent.replace(wrd, w)}\n")
                    #         self.ids.container.add_widget(item)
                    # except KeyError:
                    #     print(f'Verb for "{wrd}" is not found.')


class ProbablyKnotApp(MDApp):
    def build(self):
        self.theme_cls = ThemeManager()
        self.theme_cls.theme_style = "Dark"
        self.theme_cls.primary_palette = "Amber"
        self.theme_cls.primary_hue = "A700"

        return Manager()

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

千伏

：
主要内容：
id:main
名称：'main'
分析仪：
id:分析
名称：'分析器'
:
盒子布局：
方向：“垂直”
MDToolbar：
id:工具栏
标题：“可能结v3”
md_bg_颜色：app.theme_cls.primary_颜色
右\操作\项：[[“帮助圆轮廓”，lambda x:app.root.get\屏幕（'main'）。显示\数据（）]
MDF布局：
MDTextField：
id:句子
图标右：“书本打开大纲”
图标\u右\u颜色：app.theme\u cls.primary\u颜色
提示文字：“输入句子”
helper_text:“编写问题陈述以进行分析”
帮助器\u文本\u模式：“打开焦点”
多行：False
位置提示：{'center_x'：0.5，'center_y'：0.7}
大小提示：无
宽度：根部宽度-dp（20）
MDTextField：
id:word
图标右：“铅笔”
图标\u右\u颜色：app.theme\u cls.primary\u颜色
提示文字：“输入单词”
helper_text：“从上述句子中写出一个单词”
帮助器\u文本\u模式：“打开焦点”
多行：False
位置提示：{'center_x'：0.5，'center_y'：0.6}
大小提示：无
宽度：根部宽度-dp（20）
MDIconButton：
图标：“大脑”
位置提示：{'center_x'：0.5，'center_y'：0.4}
用户\字体\大小：64
按：app.root.get_屏幕（'analyzer'）。分析（root）
发布时：app.root.current='analyzer'
#MDRectangleFlatButton：
#文本：“帮助”
#位置提示：{'center_x'：0.75，'center_y'：.1}
#发布时：app.root.get_screen（'main'）。show_data（）
:
盒子布局：
方向：“垂直”
MDToolbar：
id:工具栏
标题：“可能结v3”
md_bg_颜色：app.theme_cls.accent_颜色
右行动项目：[[“backburger”，lambda x:main.change\u screen（root）]，[“help circle outline”，lambda x:app.root.get\u screen（'main'）。show\u data（）]
滚动视图：
MDList：
id:集装箱

我也遇到了同样的问题，我没有找到完美的解决方案，但我找到了补救办法

我在

MDToolbar

中使用

MDFloatActionButton

来代替

right\u action\u项，如下所示：

MDToolbar:
    title: 'Settings'
    elevation: 10

    MDFloatingActionButton:
        icon: 'keyboard-backspace'
        theme_text_color: 'Custom'
        elevation: 0
        md_bg_color: app.theme_cls.primary_color
       enter code here on_release: root.ids.screen_manager.current = 'Home'

谢谢，很高兴知道我没有疯！！我试试看：）瓦鲁！成功了！：）现在唯一的问题是，按下图标后，退格会给我一个奇怪的黑色圆圈轮廓。您遇到过这种情况吗？实际上，我刚刚发现我的
MDToolBar
中的
MDIconButton
似乎工作得更好。无圆阴影（我认为它来自于
MDFloatingActionButton
中的
elevation:
属性。再次感谢您，您帮助我看到了框外：）
<Manager>:
    Main:
        id: main
        name: 'main'
    Analyzer:
        id: analyze
        name: 'analyzer'


<Main>:
    BoxLayout:
        orientation: 'vertical'
        MDToolbar:
            id: toolbar
            title: "Probably Knot v3"
            md_bg_color: app.theme_cls.primary_color
            right_action_items: [["help-circle-outline", lambda x: app.root.get_screen('main').show_data()]]
        MDFloatLayout:
            MDTextField:
                id: sentence
                icon_right: "book-open-outline"
                icon_right_color: app.theme_cls.primary_color

                hint_text: "Enter Sentence"
                helper_text: "Write a problem statement to analyze"
                helper_text_mode: "on_focus"
                multiline: False
                pos_hint: {'center_x': 0.5, 'center_y': 0.7}
                size_hint_x: None
                width: root.width - dp(20)
            MDTextField:
                id: word
                icon_right: "lead-pencil"
                icon_right_color: app.theme_cls.primary_color

                hint_text: "Enter Word"
                helper_text: "Write ONE word from the above sentence"
                helper_text_mode: "on_focus"
                multiline: False
                pos_hint: {'center_x': 0.5, 'center_y': 0.6}
                size_hint_x: None
                width: root.width - dp(20)
            MDIconButton:
                icon: "brain"
                pos_hint: {'center_x': 0.5, 'center_y': 0.4}
                user_font_size: 64
                on_press: app.root.get_screen('analyzer').analyze(root)
                on_release: app.root.current = 'analyzer'

            # MDRectangleFlatButton:
            #     text: "help"
            #     pos_hint: {'center_x': 0.75, 'center_y': .1}
            #     on_release: app.root.get_screen('main').show_data()


<Analyzer>:
    BoxLayout:
        orientation: 'vertical'
        MDToolbar:
            id: toolbar
            title: "Probably Knot v3"
            md_bg_color: app.theme_cls.accent_color
            right_action_items: [["backburger", lambda x: main.change_screen(root)], ["help-circle-outline", lambda x: app.root.get_screen('main').show_data()]]
        ScrollView:
            MDList:
                id: container

MDToolbar:
    title: 'Settings'
    elevation: 10

    MDFloatingActionButton:
        icon: 'keyboard-backspace'
        theme_text_color: 'Custom'
        elevation: 0
        md_bg_color: app.theme_cls.primary_color
       enter code here on_release: root.ids.screen_manager.current = 'Home'