最后，labels.text应显示传感器数据。数据在单独的过程中生成，并通过管道传输到kivy。目前我正在尝试实现一个非常简单的最小例子。但是，我不了解动态生成标签的更新概念：
from math import sin
"""
Activate the touch keyboard. It is important that this part is on top
because the global config should be initiated first.
"""
from kivy.config import Config
Config.set('kivy', 'keyboard_mode', 'multi')
from kivy.app import App
from kivy.clock import Clock
# The Builder is used to define the main interface.
from kivy.lang import Builder
from kivy.properties import StringProperty, ObjectProperty, NumericProperty
from kivy.uix.label import Label
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.stacklayout import StackLayout
import numpy as np
class MainScreen(Screen):
pass
class DataScreen(Screen):
def __init__(self, **kwargs):
layout = StackLayout()
super(DataScreen, self).__init__(**kwargs)
self.n_probes = 8
self.label_text = []
for i in range(self.n_probes):
self.label_text.append(StringProperty())
self.label_text[i] = str(i)
for i in range(self.n_probes):
l = Label(id='l_{}'.format(i),
name='l_{}'.format(i),
text=self.label_text[i],
font_size='60sp',
height=20,
width=20,
size_hint=(0.5, 0.2))
self.ids.stack.add_widget(l)
def change_text(self):
for i in range(self.n_probes):
self.label_text[i] = str(2)
Builder.load_file('phapp.kv')
class MyApp(App):
"""
The settings App is the main app of the pHBot application.
It is initiated by kivy and contains the functions defining the main interface.
"""
def build(self):
"""
This function initializes the app interface and has to be called "build(self)".
It returns the user interface defined by the Builder.
"""
sm = ScreenManager()
sm.add_widget(MainScreen())
sm.add_widget(DataScreen())
# returns the user interface defined by the Builder
return sm
if __name__ == '__main__':
MyApp().run()
.kv文件：
<MainScreen>:
name: 'main'
BoxLayout:
orientation: 'vertical'
Button:
text: 'Go to data'
font_size: 40
on_release: app.root.current = 'data'
Button:
text: 'Exit'
font_size: 40
on_release: app.stop()
<DataScreen>:
name: 'data'
StackLayout:
id: stack
orientation: 'lr-tb'
BoxLayout:
Button:
size_hint: (0.5, 0.1)
text: 'Update'
font_size: 30
on_release: root.change_text()
Button:
size_hint: (0.5, 0.1)
text: 'Back to main menu'
font_size: 30
on_release: app.root.current = 'main'
标签未使用此版本进行更新。有什么想法吗？
答案 0 :(得分：0)
此版本正常运行。我现在还不知道为什么第一个没有成功。也许它必须与范围有关？如果我在.kv文件和.py文件中静态编码everthing（例如在此SO post中），一切正常。
from math import sin
"""
Activate the touch keyboard. It is important that this part is on top
because the global config should be initiated first.
"""
from kivy.config import Config
Config.set('kivy', 'keyboard_mode', 'multi')
from kivy.app import App
from kivy.clock import Clock
# The Builder is used to define the main interface.
from kivy.lang import Builder
from kivy.properties import StringProperty, ObjectProperty, NumericProperty
from kivy.uix.label import Label
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.stacklayout import StackLayout
import numpy as np
class MainScreen(Screen):
pass
class DataScreen(Screen):
def __init__(self, **kwargs):
layout = StackLayout()
super(DataScreen, self).__init__(**kwargs)
self.n_probes = 8
self.label_text = []
for i in range(self.n_probes):
self.label_text.append(StringProperty())
self.label_text[i] = str(i)
self.l = []
for i in range(self.n_probes):
self.l.append(Label(id='l_{}'.format(i),
text='Start {}'.format(i),
font_size='60sp',
height=20,
width=20,
size_hint=(0.5, 0.2)))
self.ids.stack.add_widget(self.l[i])
def change_text(self):
for i in range(self.n_probes):
self.l[i].text = 'Update' + str(2)
Builder.load_file('phapp.kv')
class MyApp(App):
"""
The settings App is the main app of the pHBot application.
It is initiated by kivy and contains the functions defining the main interface.
"""
def build(self):
"""
This function initializes the app interface and has to be called "build(self)".
It returns the user interface defined by the Builder.
"""
sm = ScreenManager()
sm.add_widget(MainScreen())
sm.add_widget(DataScreen())
# returns the user interface defined by the Builder
return sm
if __name__ == '__main__':
MyApp().run()
<MainScreen>:
name: 'main'
BoxLayout:
orientation: 'vertical'
Button:
text: 'Go to data'
font_size: 40
on_release: app.root.current = 'data'
Button:
text: 'Exit'
font_size: 40
on_release: app.stop()
<DataScreen>:
name: 'data'
StackLayout:
id: stack
orientation: 'lr-tb'
BoxLayout:
Button:
size_hint: (0.5, 0.1)
text: 'Update'
font_size: 30
on_release: root.change_text()
Button:
size_hint: (0.5, 0.1)
text: 'Back to main menu'
font_size: 30
on_release: app.root.current = 'main'