AttributeError: 'NoneType' 对象没有属性 'setDelegate_' 我该如何解决这个问题？

Question

基本上，我对 python 和 kivy 还很陌生，我正在尝试创建一个计时器应用程序，它会在 20 分钟后发出通知让你的眼睛休息。我用 plyer 来设置通知，我在 mac 上。通常由于 pyobjus 错误，通知不起作用，但我解决了这个问题。但现在我留下了这个新错误。

runfile('/Users/oats/Downloads/LEAF 1.0/Source Code/LEAF 0.6 .py', wdir='/Users/oats/Downloads/LEAF 1.0/Source Code') Traceback (大部分 最近通话最后一次）：

文件“/Users/oats/Downloads/LEAF 1.0/Source Code/LEAF 0.6 .py”，行 218，在 类 LeafApp(MDApp)：

文件“/Users/oats/Downloads/LEAF 1.0/Source Code/LEAF 0.6 .py”，行 240，在 LeafApp notifyMe("Hey You！休息一下！！", "你应该遵守 20-20-20 规则，保持眼睛健康")

文件“/Users/oats/Downloads/LEAF 1.0/Source Code/LEAF 0.6 .py”，行 231，在通知我 通知.通知（

文件 “/Users/oats/opt/anaconda3/lib/python3.8/site-packages/plyer/facades/notification.py”， 第 79 行，在通知中 self._notify(

文件 “/Users/oats/opt/anaconda3/lib/python3.8/site-packages/plyer/platforms/macosx/notification.py”， 第 38 行，在 通知中 usrnotifctr.setDelegate(self)

AttributeError: 'NoneType' 对象没有属性 'setDelegate_'

是完整的错误消息。我的代码如下。

'''

from kivymd.app import MDApp
from kivy.lang.builder import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
from kivymd.uix.picker import MDDatePicker
from kivymd.uix.picker import MDThemePicker
from kivy.config import Config
from kivy.uix.boxlayout import BoxLayout
from kivymd.theming import ThemableBehavior
from kivymd.uix.list import MDList
from kivy.properties import ObjectProperty
from kivymd.uix.navigationdrawer import MDNavigationDrawer
from kivy.properties import StringProperty, ListProperty
from kivy.lang import Builder
from kivy.core.window import Window
from plyer import notification
import time
import plyer


Config.set('graphics', 'width', '1600')
Config.set('graphics', 'height', '1200')


KV = '''
<Box@BoxLayout>:
    bg: .65, .48, .35, 1 
       
             

BoxLayout:
    Rectangle:    
        size: 1600, 1200

    Box:
        bg: app.theme_cls.bg_light
    Box:
        bg: app.theme_cls.bg_normal
    Box:
        bg: app.theme_cls.bg_dark
    Box:
        bg: app.theme_cls.bg_darkest
            
'''
            
screen_helper = """
ScreenManager:
    MenuScreen:
    HomeScreen:
    BreakScreen:
    SettingsScreen
        
<MenuScreen>:
    name: 'menu'
    
  
        
    MDLabel:
        rectangle:
        background_color: .65, .48, .35, 1           
        size: 300, 700
        pos_hint: {'center_x':0.1, 'center_y':0.0}
        
                
    MDLabel:
        text: "Welcome to"
        font_style: 'H2'
        size:500, 500
        pos_hint: {'center_x':0.95,'center_y':0.84}
        
    MDLabel:
        text: "LEAF"
        font_style: 'H3'
        size:500, 500
        pos_hint: {'center_x':1.045,'center_y':0.7}
        
        
    MDFlatButton:
        text: 'Calendar'
        font_style: 'H6'
        pos_hint: {'center_x':0.091,'center_y':0.65}
        on_release: app.show_date_picker()
            
            
    MDFlatButton:
        text: 'Home'
        font_style: 'H6'
        pos_hint: {'center_x':0.076,'center_y':0.57}
        on_press: root.manager.current = 'home'
        
    MDFlatButton:
        text: 'Settings'
        font_style: 'H6'
        pos_hint: {'center_x':0.09,'center_y':0.49}
        on_press: root.manager.current = 'settings'
        
            
    MDRectangleFlatButton:
        text: 'Continue'
        font_style: 'H6'
        pos_hint: {'center_x':0.61,'center_y':0.345}
        on_press: root.manager.current = 'home'
   


    
<HomeScreen>:
    name: 'home'    
                
        
    MDToolbar:
        id: toolbar
        title: "Home
        pos_hint: {"top": 1}
        elevation: 5
        left_action_items: [["menu", lambda x: nav_drawer.set_state("open")]]
        
    Widget:

        MDNavigationDrawer:
            id: nav_drawer
    
            ContentNavigationDrawer:
                orientation: 'vertical'
                padding: "8dp"
                spacing: "8dp"
                

                MDFlatButton:
                    text: 'Return to menu'
                    font_style: 'Subtitle1'
                    on_release: root.manager.current = 'menu'

                MDFlatButton:
                    text: 'Open Calendar'
                    font_style: 'Subtitle1'
                    on_release: app.show_date_picker()
                    
                MDFlatButton:
                    text: 'Open Settings'
                    font_style: 'Subtitle1'
                    on_press: root.manager.current = 'settings'



    
                    
                    
                            
                
                
            
    
<BreakScreen>:
    name: 'break'
    
<SettingsScreen>:
    name: 'settings'
    
    
    MDFlatButton:
        text: 'Return to menu'
        font_style: 'H6'
        pos_hint: {'center_x':0.1,'center_y':0.05}
        on_press: root.manager.current = 'menu'
        
    MDFlatButton:
        text: 'Change Theme'
        font_style: 'H6'
        pos_hint: {'center_x':0.85,'center_y':0.95}
        on_release: app.show_theme_picker() 
        
    MDFloatingActionButton:
        icon: 'moon-waning-crescent'
        theme_text_color: "Custom"
        md_bg_color: 0, 0.039, 0.867, 0.557
        pos_hint: {'center_x':0.9,'center_y':0.3}
        on_press: self.theme_cls.theme_style = "Dark"  # "Light"
        
    MDFloatingActionButton:
        icon: 'MDFloatingActionButton'
        icon: 'lightbulb'
        pos_hint: {'center_x':0.9,'center_y':0.1}
        on_press: self.theme_cls.theme_style = "Light"  # "Dark"
        
        
"""  

class MenuScreen(Screen):
    pass


class HomeScreen(Screen):
    pass


class BreakScreen(Screen):
    pass

class SettingsScreen(Screen):
    pass

class ContentNavigationDrawer(BoxLayout):
    pass

class DrawerList(ThemableBehavior, MDList):
    pass


    
sm = ScreenManager()
sm.add_widget(MenuScreen(name='menu'))
sm.add_widget(HomeScreen(name='profile'))
sm.add_widget(BreakScreen(name='upload'))
sm.add_widget(SettingsScreen(name='settings'))



class LeafApp(MDApp):
    
    def show_date_picker(self):
        date_dialog = MDDatePicker()
        date_dialog.open()

    def show_theme_picker(self):
        theme_dialog = MDThemePicker()
        theme_dialog.open()



    def notifyMe(ttle, msg):
        notification.notify(
            title = ttle,
            message = msg,
            timeout = 10,
    )


    if __name__ == '__main__':
        while True:
            notifyMe("Hey You! take a break now !!", "You should follow the 20-20-20 rule to keep your eyes healthy")
            time.sleep(1200)
            



    def build(self):
        screen = Builder.load_string(screen_helper)
        return screen
    
LeafApp().run()
'''

再次感谢任何伸出援手的人。我完全糊涂了，需要帮助！

Answer 1

尝试对您的代码进行轻微重构，如下所示：

def notifyMe(self, ttle, msg):  # added "self" arg
    notification.notify(
        title=ttle,
        message=msg,
        timeout=10,
    )

def timer_loop(self):
    while True:
        self.notifyMe("Hey You! take a break now !!", "You should follow the 20-20-20 rule to keep your eyes healthy")
        time.sleep(1200)

def build(self):
    # run timer as a separate thread
    threading.Thread(target=self.timer_loop, daemon=True).start()

    screen = Builder.load_string(screen_helper)
    return screen