React Native Promise <实现>

【问题标题】：React Native Promise <fulfilled>React Native Promise <实现>
【发布时间】：2021-05-26 01:10:49
【问题描述】：

为什么Promise已经兑现了我却拿不到token？

  useFocusEffect(
    React.useCallback(() => {
      const task = InteractionManager.runAfterInteractions(() => 
      {
        const _token =  AsyncStorage.getItem('@token');
        setToken(_token);
        console.log("============================================", _token)
        GetFolderInformation(token, folderId)
        navigation.closeDrawer();
      });
      return () => task.cancel();
    }, [folderId])
  );

【问题讨论】：

标签： reactjs react-native

【解决方案1】：

您需要等待AsyncStorage.getItem('@token')。

useFocusEffect(
    React.useCallback(() => {
      const task = InteractionManager.runAfterInteractions(async () => {
        const _token =  await AsyncStorage.getItem('@token');
        setToken(_token);
        console.log("============================================", _token)
        GetFolderInformation(token, folderId)
        navigation.closeDrawer();
      });

      return () => task.cancel();
    }, [folderId])
  );

【讨论】：