React Native：钩子 - useRef

Question

I have been working on ReactJS but totally new to React Native. I am trying to use useRef on TextInput but it did not work.

const Playground = () =>{

  const inputName = useRef();

  const addName = e => {
    Alert.alert(inputName.current.value);  
  }

  return (
      <SafeAreaView>    
            <TextInput ref={inputName} placeholder="name"></TextInput>
            <Button title="add" onPress={addName}></Button>          
      </SafeAreaView>
  );
}

export default Playground;

With the code I use in ReactJS above, it always returns me empty string when pressing the button to addName . I also tried to useEffect as below but got the same results.

  useEffect(() => {
    if(!inputName.current) return;

    Alert.alert(inputName.current.value);

  }, [inputName.current])

Tried to do some search but I could not find the answer. Can I use useRef in React Native as the same as ReactJS?

Answer 1

You can try this:

inputName.current._root.props.value

Answer 2

I believe React Native strongly encourages using state instead of ref. You can get away with useState in this particular case.

See also Direct Manipulation