不显示本地通知

Question

我需要显示一个简单的本地通知，以了解其工作原理。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);
  };

并以这种方式调用此方法：

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

要编写此代码，我使用了this教程。但是，当我运行应用程序时，未显示通知，但存在权限。那么，问题的原因是什么，我该如何解决？

Answer 1

您可以尝试一下，

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();
  }

希望这会有所帮助。