如何通过另一个选项卡中的按钮更改选项卡？- KivyMD

from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivymd.app import MDApp

class TabSwitchApp(MDApp):
    def switch_tab(self, tab):
        # 在这里编写选项卡的切换逻辑
        pass

    def build(self):
        # 构建应用程序界面
        return Builder.load_string('''
BoxLayout:
    orientation: 'vertical'
    MDToolbar:
        title: 'Tab Switch Example'
    MDTabs:
        on_tab_switch: app.switch_tab(*args)
        Tab:
            text: 'Tab 1'
            MDLabel:
                text: 'Content of Tab 1'
        Tab:
            text: 'Tab 2'
            MDLabel:
                text: 'Content of Tab 2'
        Tab:
            text: 'Tab 3'
            MDLabel:
                text: 'Content of Tab 3'
''')

class TabSwitchApp(MDApp):
    def switch_tab(self, instance_tabs, instance_tab, instance_tab_label, tab_text):
        tab_index = instance_tabs.ids.index(instance_tab)
        if tab_index == 0:
            # 切换到第一个选项卡
            instance_tabs.switch_tab('tab2')
        elif tab_index == 1:
            # 切换到第二个选项卡
            instance_tabs.switch_tab('tab3')
        elif tab_index == 2:
            # 切换到第三个选项卡
            instance_tabs.switch_tab('tab1')

    def build(self):
        # 构建应用程序界面
        return Builder.load_string('''
BoxLayout:
    orientation: 'vertical'
    MDToolbar:
        title: 'Tab Switch Example'
    MDTabs:
        on_tab_switch: app.switch_tab(*args)
        Tab:
            id: tab1
            text: 'Tab 1'
            MDLabel:
                text: 'Content of Tab 1'
        Tab:
            id: tab2
            text: 'Tab 2'
            MDLabel:
                text: 'Content of Tab 2'
        Tab:
            id: tab3
            text: 'Tab 3'
            MDLabel:
                text: 'Content of Tab 3'
''')

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