Question

在我的应用程序中，我有一个GameScreen，其中包含带有一些文本的ClueButton1小部件。按下该按钮可将用户带到ClueScreen（使用kivy屏幕管理器），该按钮有4个按钮，每个按钮都是一个应答选择。当用户在ClueScreen上按下正确的ClueAnswerButton1时，如何在GameScreen上更改ClueButton1的background_normal属性？

我已经尝试将ClueButton1指定为id并在def check_choice（）中使用它作为GameScreen.cluebutton1id.background_normal = ...，但得到错误：

AttributeError: 'kivy.properties.ObjectProperty' object has no attribute 'background_normal'

main.py代码在这里：

class GameScreen(Screen):
    ...


class ClueScreen(Screen):
    ...

    def check_choice(self):

        if self.choice0.state == 'down':
            if self.choice0.text == self.correct:
                self.message.text = "[color=006600]Correct! Click back to game and keep" \
                        "playing![/color]"
                self.choice0.background_disabled_down = 'atlas://img/myatlas/green_button5'
                self.choice0.disabled = True
                self.choice1.disabled = True
                self.choice2.disabled = True
                self.choice3.disabled = True
                return
            else:
                self.message.text = "Try again"
                self.choice0.background_disabled_down = 'atlas://img/myatlas/red_button5'
                self.choice0.disabled = True      
    ...

.kv代码在这里：

<GameScreen>:
    GeneralFloatLayout:
    GeneralAnchorLayout:
        GeneralBoxLayout:
            GameGridLayout:
                ClueButton1:
                    text: root.question
                    on_press: root.manager.current = 'clue_screen';

<ClueScreen>:
    message: message
    choice0: choice0
    choice1: choice1
    choice2: choice2
    choice3: choice3

    ClueBoxLayout:
        ClueLabel:
            text: "[color=0046C3]" + "Put label Here" + "[/color]"
        ClueMessage:
            id: message
        ClueAnswerButton1:
            id: choice0
            on_press: root.check_choice()
        ClueAnswerButton1:
            id: choice1
            on_press: root.check_choice()
        ClueAnswerButton1:
            id: choice2
            on_press: root.check_choice()
        ClueAnswerButton1:
            id: choice3
            on_press: root.check_choice()
        ClueGridLayout:
            ReturnButton:
                text: 'Back to game'
                on_press: root.manager.current = 'game_home'

Answer 1

您尝试在类对象上分配属性而不是实例。您可以通过ScreenManager获取另一个屏幕的实例。假设您从根小部件（即root.check_choice()）运行此命令：

self.manager.get_screen('game_home').cluebutton1id.background_normal = 'path/to/image.png'

通过按另一个屏幕中的按钮更改Kivy按钮小部件属性

1 个答案: