你应该看看世博会的文档
下面是一个非常简单的例子，说明如何处理每周日触发的每周通知：

import * as Notifications from 'expo-notifications';

async function scheduleAndCancel() {
  const identifier = await Notifications.scheduleNotificationAsync({
    content: {
      title: 'Hello, it’s Sunday',
    },
    trigger: { weekday: 1, repeats: true },
  });

  // save identifier somewhere in AsyncStorage or something else to be able to cancel it.
}