Javascript 本地通知isn'；t显示

我需要显示一个简单的本地通知，以了解它是如何工作的。为此，我编写了以下代码：

askPermissions = async () => {
    const { status: existingStatus } = await Permissions.getAsync(Permissions.NOTIFICATIONS);
    let finalStatus = existingStatus;
    if (existingStatus !== 'granted') {
      const { status } = await Permissions.askAsync(Permissions.NOTIFICATIONS);
      finalStatus = status;
    }
    return finalStatus === 'granted';
  };

  sendNotificationImmediately = async () => {
    const notificationId = await Notifications.presentLocalNotificationAsync({
      title: 'This is header',
      body: 'This is body',
    });
    console.log(notificationId);
  };

并以这样的方式调用此方法：

componentDidMount() {
    if (this.askPermissions()) {
      console.log('Permission presents');
      this.sendNotificationImmediately();
    } else {
      console.log('Denied');
    }
  }

为了编写这段代码，我使用了教程。但当我运行应用程序时，不会显示通知，但会显示权限。那么，问题的原因是什么？我该如何解决呢？

您可以试试这个

askPermissions = async () => {
    const { status: existingStatus } = await Permissions.getAsync(Permissions.NOTIFICATIONS);
    let finalStatus = existingStatus;
    if (existingStatus !== 'granted') {
      const { status } = await Permissions.askAsync(Permissions.NOTIFICATIONS);
      finalStatus = status;
    } else if (finalStatus === 'granted') {
      Notifications.presentLocalNotificationAsync({
        title: 'This is header',
        body: 'This is body',
      });
    }

componentDidMount() {
    this.askPermissions();
  }

希望这有帮助。

你可以试试这个

askPermissions = async () => {
    const { status: existingStatus } = await Permissions.getAsync(Permissions.NOTIFICATIONS);
    let finalStatus = existingStatus;
    if (existingStatus !== 'granted') {
      const { status } = await Permissions.askAsync(Permissions.NOTIFICATIONS);
      finalStatus = status;
    } else if (finalStatus === 'granted') {
      Notifications.presentLocalNotificationAsync({
        title: 'This is header',
        body: 'This is body',
      });
    }

componentDidMount() {
    this.askPermissions();
  }

希望这有帮助