AttributeError 'Button' 对象没有属性 scrlFBtn

Question

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？我试图做到这一点，以便在您单击时清除屏幕（删除小部件）。请帮帮我 =)

Answer 1

您的代码有几个错误和错误的编程习惯：

如果您在 class 内部和 class 的任何方法外部声明变量，则将是 class 变量，而不是 [=27 的属性=]，所以如果你想稍后使用 self，那么这样做不是一个好的做法，所有的代码必须在 class.
[=24= 的方法中]
on_someproperty 作为参数等待接收参数的函数，在你的情况下 sas() 不接收它们所以解决方案是使用 lambda 方法。

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 'Button' 对象没有属性 scrlFBtn

AttributeError 'Button' object has no attribute scrlFBtn

python

button

attributeerror

kivy