AttributeError“按钮"对象没有属性scrlFBtn

问题描述：

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.core.window import Window
from kivy.uix.scrollview import ScrollView
from kivy.effects.scroll import ScrollEffect
from kivy.uix.widget import Widget
from kivy.uix.button import Button

class BSGameMain:
    def sas(self):
        # blmain.remove_widget(scrlFBtns)
        self.scrlFBtns.remove_widget(blbtns)

    blmain = BoxLayout(orientation = 'vertical') # MainBoxLayout init

    scrlFBtns = ScrollView(effect_cls = 'ScrollEffect')

    blbtns = BoxLayout(
        orientation = 'vertical',
        size_hint_y = None
        ) # BoxLayout for buttons

    blbtns.bind(minimum_height = blbtns.setter('height'))
    scrlFBtns.add_widget(blbtns)

    for i in range (2):
        blbtns.add_widget(Button(
            text='asd',
            size_hint_y = None,
            height = 40,
            on_press = sas
            ))

    lblmain = Label(text = 'asd')
    blmain.add_widget(lblmain)
    blmain.add_widget(scrlFBtns)


class BSApp(App):
    def build(self):
        game = BSGameMain()
        return game.blmain

if __name__ == "__main__":
    BSApp().run()

AttributeError'Button'对象没有属性scrlFBtn.问题是什么?我正在努力做到这一点，以便当您单击时，屏幕被清除(窗口小部件已删除). Рelpme please =)

AttributeError 'Button' object has no attribute scrlFBtn. What is the problem? I'm trying to make it so that when you clicked, the screen was cleared (Widget was deleted). Рelp me please =)

答

您的代码有一些错误和不良的编程习惯:

Your code has several errors and bad programming practices:

如果声明的变量在类之内并且在该类的任何方法之外，则将是类变量，而不是类的属性，因此，如果您以后要使用self，所有这些代码都必须在类的方法内.

if you declare variables that are inside a class and outside any method of the class will be class variables and not attributes of the class, so it is not a good practice to do so if you want to use later self, all that code must be within a method of a class.

on_someproperty等待接收参数的函数作为参数，在您的情况下sas()不接收参数，因此解决方案是使用lambda方法.

on_someproperty wait as parameter a function that receives parameters, in your case sas() does not receive them so the solution is to use a lambda method.

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.uix.scrollview import ScrollView
from kivy.effects.scroll import ScrollEffect
from kivy.uix.button import Button

class BSGameMain:
    def __init__(self):
        self.blmain = BoxLayout(orientation = 'vertical') # MainBoxLayout init

        self.scrlFBtns = ScrollView(effect_cls = 'ScrollEffect')

        self.blbtns = BoxLayout(
            orientation = 'vertical',
            size_hint_y = None )

        self.blbtns.bind(minimum_height = self.blbtns.setter('height'))
        self.scrlFBtns.add_widget(self.blbtns)

        for i in range(2):
            self.blbtns.add_widget(Button(
                text='asd',
                size_hint_y = None,
                height = 40,
                on_press = lambda *args: self.sas()))

        lblmain = Label(text = 'asd')
        self.blmain.add_widget(lblmain)
        self.blmain.add_widget(self.scrlFBtns)

    def sas(self):
        self.scrlFBtns.remove_widget(self.blbtns)


class BSApp(App):
    def build(self):
        game = BSGameMain()
        return game.blmain

if __name__ == "__main__":
    BSApp().run()

AttributeError“按钮"对象没有属性scrlFBtn

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