带有kivy的可滚动注册屏幕

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.scrollview import ScrollView
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button

class RegistrationForm(BoxLayout):
    def __init__(self, **kwargs):
        super(RegistrationForm, self).__init__(**kwargs)
        self.orientation = 'vertical'
        
        # 添加表单字段
        self.add_widget(Label(text='Username'))
        self.username = TextInput(multiline=False)
        self.add_widget(self.username)
        
        self.add_widget(Label(text='Email'))
        self.email = TextInput(multiline=False)
        self.add_widget(self.email)
        
        self.add_widget(Label(text='Password'))
        self.password = TextInput(password=True, multiline=False)
        self.add_widget(self.password)
        
        # 添加提交按钮
        self.submit_button = Button(text='Register')
        self.submit_button.bind(on_press=self.submit_form)
        self.add_widget(self.submit_button)

    def submit_form(self, instance):
        print(f'Username: {self.username.text}')
        print(f'Email: {self.email.text}')
        print(f'Password: {self.password.text}')

class ScrollableRegistrationApp(App):
    def build(self):
        scroll_view = ScrollView()
        form = RegistrationForm()
        scroll_view.add_widget(form)
        return scroll_view

if __name__ == '__main__':
    ScrollableRegistrationApp().run()