问如何在“反应-本机-下拉-选择器”中取消已选择的项？

EN

import { View } from 'react-native';

import DropDownPicker from 'react-native-dropdown-picker';

export default function App() {
  const [open, setOpen] = useState(false);
  const [value, setValue] = useState('');
  const [items, setItems] = useState([
    {label: 'Spain', value: 'spain'},
    {label: 'Madrid', value: 'madrid'},
    {label: 'Barcelona', value: 'barcelona'},
    {label: 'Italy', value: 'italy'},
    {label: 'Rome', value: 'rome'},
    {label: 'Finland', value: 'finland'}
  ]);
  
   const selectValue =  (currentValue:( ((prevState: string) => string) | string )  ) => {
    let chosenValue = (currentValue as ((prevState: string) => string))()
    if (chosenValue === value) {
      setValue('') // basically here, I reset the value to initial state if the selected value is exactly the same with the previously selected one
    } else {
      setValue(currentValue)
    }
  }

  return (
    <View style={{
      flex: 1,
      alignItems: 'center',
      justifyContent: 'center',
      paddingHorizontal: 15
    }}>
      <DropDownPicker
        open={open}
        value={value}
        items={items}
        setOpen={setOpen}
        setValue={selectValue}
        setItems={setItems}
      />
    </View>
  );
}