Kivy 时钟和条件语句

Question

我连续创建了变量 timer_loop 到运行。我想用其他变量做条件语句，但我做不到。下面是一个例子，如果开关被激活，我试图每 30 分钟 "do something"。任何反馈将不胜感激:)

from kivy.app import App
from kivy.lang import Builder
from kivy.clock import Clock
import datetime
import time

theRoot = Builder.load_string('''

StackLayout:
    orientation: 'lr-tb'
    padding: 10
    spacing: 5

    Label:
        text: "Zone 1 Valve"
        size_hint: .5, .1

    Switch:
        id: switch_id
        on_active: app.switch_on1(self, self.active)
        size_hint: .5, .1
''')

class theApp(App):

    def build(self):
        Clock.schedule_interval(self.timer_loop, 2)
        return theRoot

    def timer_loop(self, dt):  
        now_minute = int(time.strftime("%M"))

        if switch_on1.active & now.minute ==30 : # how do I use the varible switch_on1 in this loop for conditonal statements???
            print("Do something")
        else:
            print("Do nothing")

    def switch_on1(self, instance, value):
        if value is True:
            print("Switch 1 On")
        else:
            print("Switch 1 Off")

if __name__ == '__main__':
    theApp().run()

Answer 1

总是建议将 class 视为一个黑盒子，我们可以建立输入并获得输出，而在 kivy 中可以通过属性来完成，例如在这种情况下，您创建活动 [= StackLayout 的 22=] 反映了 switch_id 的活动属性，并且由于 theRoot 是从 python 可见的 StackLayout 对象，我们使用它：

from kivy.app import App
from kivy.lang import Builder
from kivy.clock import Clock
import time

theRoot = Builder.load_string('''
StackLayout:
    active: switch_id.active # <---
    orientation: 'lr-tb'
    padding: 10
    spacing: 5

    Label:
        text: "Zone 1 Valve"
        size_hint: .5, .1

    Switch:
        id: switch_id
        size_hint: .5, .1
''')

class theApp(App):
    def build(self):
        Clock.schedule_interval(self.timer_loop, 2)
        return theRoot

    def timer_loop(self, dt):  
        now_minute = int(time.strftime("%M"))
        if theRoot.active and now_minute == 30: # <---
            print("Do something")
        else:
            print("Do nothing")


if __name__ == '__main__':
    theApp().run()

如您所知，没有必要使用 switch_on1，因为主要条件是计时器的触发。

Kivy 时钟和条件语句

Kivy Clock & Conditional Statements

python

kivy

kivy-language