Kivy/Python Countdown App 项目 kivy 没有属性 'built

问题描述

问题:什么是没有属性已构建"错误，我需要做什么来更正此代码，以便它可以接收日期时间对象并显示倒计时?抱歉，帖子太长了.

Question: What is a 'has no attribute 'built' error, and what do I need to do to correct this code so that it can take in a datetime object and display the count down? Sorry for the long post.

我已经提供了代码和 .kv 文件的链接.

I've provided the code and a link to the .kv file.

我尝试创建一个倒计时时钟，它将 datetime 对象作为参数并倒计时到该日期(使用 python 和 kivy).它基本上是对 Adam Giermanowski 的倒计时教程.

I tried to create a countdown clock that takes a datetime object as a parameter and counts down to that date (using python and kivy). It's basically an slight adaptation of Adam Giermanowski's countdown timer tutorial.

这是我的代码:

from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import StringProperty
from kivy.clock import Clock
import datetime

#datetime object
b= datetime.datetime(2016,9,12,3,5)

class Counter_Timer(BoxLayout):
    days = StringProperty()
    hours = StringProperty()
    minutes = StringProperty()
    seconds = StringProperty()

    def __init__(self, datetimeOBJ):
        self.datetimeOBJ = datetimeOBJ

    def update(self, dt):
        #the difference in time
        delta = self.datetimeOBJ - datetime.datetime.now()
        self.days = str(delta.days)
        hour_string = str(delta).split(', ')[1]
        self.hours = hour_string.split(':')[0]
        self.minutes = hour_string.split(':')[1]
        self.seconds = hour_string.split(':')[2].split('.')[0]


class Counter(App):
    #takes a datetime object as a parameter 
    def __init__(self, datetimeOBJ):
        self.datetimeOBJ = datetimeOBJ 

    def build(self):
        Counter = Counter_Timer(self.datetimeOBJ)
        Clock.schedule_interval(Counter.update, 1.0)
        return Counter

if __name__=='__main__':
    Counter(b).run()

这是 Counter(b).run() 行的错误:

Here's the error on the Counter(b).run() line:

AttributeError: 'Counter' object has no attribute 'built'

推荐答案

你必须在重写 __init__ 时调用超类的构造函数，这样构造函数所做的所有事情才能拥有课堂作业的其他方法已完成.你的 init 方法应该是这样的:

You have to call the superclasses constructor when you override __init__, so that all of the things that that constructor does in order to have the other methods of the class work gets done. Your init method should be this:

def __init__(self, datetimeOBJ):
    App.init(self)
    self.datetimeOBJ = datetimeOBJ 

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