Kivy按钮点击清空TextField报错：'super'对象无'getattr'属性

1. MDLabel语法错误 #

kv代码中MDLabel:your text`属于无效语法，直接删除多余的your text部分，改为：

MDLabel:

2. TextField的id格式错误 #

Kivy中组件id不需要用引号包裹，修改两个TextField的id：

id: t1  # 移除原有双引号

id: t2  # 移除原有双引号

3. on_release事件赋值符号错误 #

按钮点击事件中使用冒号:赋值是错误的，Kivy语言中赋值需用等号=，修改为：

on_release: 
    root.ids.t1.text = ""
    root.ids.t2.text = ""

4. rgba颜色值范围错误 #

Kivy中rgba()函数参数需为0-1之间的浮点数，不能用0-255的整数，需将数值除以255：

• MDLabel的color：color: 135/255, 133/255, 193/255, 1
• TextField的foreground_color、cursor_color：foreground_color: 0/255, 0/255, 59/255, 1
• Button画布中的Color：rgb: 52/255, 0/255, 231/255（rgb模式无需alpha值）

修复后的完整studentregister.kv代码 #

MDScreen:
    name: "student_create"
    MDFloatLayout:
        md_bg_color: 1,1,1,1
        MDIconButton:
            icon: "arrow-left"
            pos_hint: {"center_y": .95}
            on_release:
                root.manager.transition.direction= "right"
                root.manager.current= "newaccount"
        Image:
            source: "images/newstud.png"
            pos_hint: {"center_x": .78, "center_y": .9}
            size_hint: .13, .13
        MDLabel:
            text: 'Create New Student Account'
            font_size: "18sp"
            pos_hint: {"center_x": .6, "center_y": .84}
            color: 135/255, 133/255, 193/255, 1
        MDFloatLayout:
            size_hint: .7, .07
            pos_hint: {"center_x": .5, "center_y": .73}
            MDTextField:
                id: t1
                hint_text: 'Calling Name'
                pos_hint: {'center_x': 0.43, 'center_y': 0.43}
                background_color: 1,1,1,0
                foreground_color: 0/255, 0/255, 59/255, 1
                cursor_color: 0/255, 0/255, 59/255, 1
                font_size: '12sp'
                cursor_width: '2sp'
                multiline: False
        MDFloatLayout:
            size_hint: .7, .07
            pos_hint: {"center_x": .5, "center_y": .65}
            MDTextField:
                id: t2
                hint_text: 'Surname'
                pos_hint: {'center_x': 0.43, 'center_y': 0.43}
                background_color: 1,1,1,0
                foreground_color: 0/255, 0/255, 59/255, 1
                cursor_color: 0/255, 0/255, 59/255, 1
                font_size: '12sp'
                cursor_width: '2sp'
                multiline: False                        
        Button:
            text: "Clear"
            size_hint: .35, .065
            background_color: 0,0,0,0
            pos_hint: {"center_x": .32, "center_y": .06}
            on_release: 
                root.ids.t1.text = ""
                root.ids.t2.text = ""
            canvas.before:
                Color:
                    rgb: 52/255, 0/255, 231/255
                RoundedRectangle:
                    size: self.size
                    pos: self.pos
                    radius: [5] 

额外提示 #

• 建议使用KivyMD提供的MDButton替代普通Button，风格更统一
• 确保图片路径images/newstud.png存在，否则会加载失败

内容的提问来源于stack exchange，提问作者Sam