Question

我是本机反应的新手，我使用一个信号进行通知。我从OneSignal.configure();并按照我已完成的代码得到了一个信号用户播放器ID，但该播放器ID仅在控制台上可见。我正在使用setState来保存状态，但是显示错误setState is not a function。如何获取该玩家ID并将其保存在状态中。

代码：

componentWillMount() {
          OneSignal.init("d447e6e2-0c8e-4781-8292-6e77d2e86691");

          OneSignal.configure();
          OneSignal.addEventListener('received', this.onReceived);
          OneSignal.addEventListener('opened', this.onOpened);
          OneSignal.addEventListener('ids', this.onIds);
      }

      componentWillUnmount() {
          OneSignal.removeEventListener('received', this.onReceived);
          OneSignal.removeEventListener('opened', this.onOpened);
          OneSignal.removeEventListener('ids', this.onIds);
      }

      onReceived(notification) {
          console.log("Notification received: ", notification);
      }

      onOpened(openResult) {
        console.log('Message: ', openResult.notification.payload.body);
        console.log('Data: ', openResult.notification.payload.additionalData);
        console.log('isActive: ', openResult.notification.isAppInFocus);
        console.log('openResult: ', openResult);
      }

      onIds(device) {
        console.log('Device info: ', device);
      console.log('player id: ', device.userId);
       this.setState({
            pid: device.userId,
          })
       console.log(this.state.pid);
      }

Answer 1

事件监听器功能不知道您的this，因此您必须使用bind将this放入其中。

componentWillMount() {
    OneSignal.init('ONESIGNAL-APP-ID');

    OneSignal.addEventListener('received', this.onReceived.bind(this));
    OneSignal.addEventListener('opened', this.onOpened.bind(this));
    OneSignal.addEventListener('ids', this.onIds.bind(this));
    OneSignal.configure();
}

更新

您也可以声明为箭头函数以避免.bind（this）：

componentWillMount() {
    OneSignal.init('ONESIGNAL-APP-ID');

    OneSignal.addEventListener('received', this.onReceived);
    OneSignal.addEventListener('opened', this.onOpened);
    OneSignal.addEventListener('ids', this.onIds);
    OneSignal.configure();
}

onReceived = () => {}
onOpened = () => {}
onIds = () => {}

如何在反应本机状态下保存一个信号播放器ID

1 个答案: