Kivy recycleview 不更新时钟调用功能

Question

我的应用程序有一个计时器作为 recycleview 中的数据，它将更新以每秒更改计时器的文本。所以我使用 Clock 每隔一秒调用 timer_update 函数来更新时间。

问题是计时器文本在终端上打印时会更新，但在应用程序屏幕上不会更新。

这是我的代码：

import datetime
from kivy.clock import Clock
from kivy.lang import Builder
from kivymd.app import MDApp
from kivy.properties import StringProperty
from kivymd.uix.boxlayout import MDBoxLayout
from kivy.uix.screenmanager import ScreenManager, Screen


Builder.load_string( '''
<Timer>:
    orientarion: 'vertical'
    md_bg_color: 0, 0, 1, 1
        
    MDLabel:
        text: root.text
        color: 1,1,1,1
        halign: 'center'
            
<MyLayout>:
    MDBoxLayout:
        orientation: 'vertical'
    
        RecycleView:
            id: rv
            key_viewclass: 'viewclass'
            key_size: 'height'
            effect_cls: 'ScrollEffect'
            
            RecycleBoxLayout:
                padding: dp(10)
                size_hint_y: None
                default_size: None, dp(60)
                default_size_hint: 1, None
                height: self.minimum_height
                orientation: 'vertical'
                   
''')
class Sm(ScreenManager):
    pass
    
    
class Timer(MDBoxLayout):
    text = StringProperty()
    

class MyLayout(Screen):
    
    def on_enter(self):
        self.add_timer()
        Clock.schedule_interval(self.update_timer, 1)

    def update_timer(self, dt):
        self.ids.rv.data[0]['text'] = str(datetime.datetime.now())
        print(self.ids.rv.data[0]['text'])
        
    def add_timer(self):
        self.ids.rv.data.append(
            {
                "viewclass": "Timer",
                "text": str(datetime.datetime.now()),
                "callback": lambda x: x,
            }
        )
        

class MyApp(MDApp):
    
    def build(self):
        sm = Sm()
        sm.add_widget(MyLayout())
        return sm
        
MyApp().run()

Answer 1

如果您在更新数据后调用 self.ids.rv.refresh_from_data() 应该可以解决问题。

完整示例：

import datetime
from kivy.clock import Clock
from kivy.lang import Builder
from kivymd.app import MDApp
from kivy.properties import StringProperty
from kivymd.uix.boxlayout import MDBoxLayout
from kivy.uix.screenmanager import ScreenManager, Screen


Builder.load_string( '''
<Timer>:
    orientarion: 'vertical'
    md_bg_color: 0, 0, 1, 1
        
    MDLabel:
        text: root.text
        color: 1,1,1,1
        halign: 'center'
            
<MyLayout>:
    MDBoxLayout:
        orientation: 'vertical'
    
        RecycleView:
            id: rv
            key_viewclass: 'viewclass'
            key_size: 'height'
            effect_cls: 'ScrollEffect'
            
            RecycleBoxLayout:
                padding: dp(10)
                size_hint_y: None
                default_size: None, dp(60)
                default_size_hint: 1, None
                height: self.minimum_height
                orientation: 'vertical'
                   
''')
class Sm(ScreenManager):
    pass
    
    
class Timer(MDBoxLayout):
    text = StringProperty()
    

class MyLayout(Screen):
    
    def on_enter(self):
        self.add_timer()
        Clock.schedule_interval(self.update_timer, 1)

    def update_timer(self, dt):
        self.ids.rv.data[0]['text'] = str(datetime.datetime.now())
        self.ids.rv.refresh_from_data()
        print(self.ids.rv.data[0]['text'])
        
    def add_timer(self):
        self.ids.rv.data.append(
            {
                "viewclass": "Timer",
                "text": str(datetime.datetime.now()),
                "callback": lambda x: x,
            }
        )

class MyApp(MDApp):
    
    def build(self):
        sm = Sm()
        sm.add_widget(MyLayout())
        return sm
        
MyApp().run()

Kivy recycleview 不更新时钟调用功能

Kivy recycleview not updating on Clock call function

python

kivy

kivymd

recycleview